Cephalopoda: A class in the phylum MOLLUSCA comprised of SQUID; CUTTLEFISH; OCTOPUS; and NAUTILUS. These marine animals are the most highly organized of all the mollusks.Nautilus: The sole genus in the family Nautilidae, order Nautilida, comprised of CEPHALOPODS with spiral external shells that are separated into chambers.Octopodiformes: A superorder in the class CEPHALOPODA, consisting of the orders Octopoda (octopus) with over 200 species and Vampyromorpha with a single species. The latter is a phylogenetic relic but holds the key to the origins of Octopoda.Sepia: A genus of cuttlefish in the family Sepiidae. They live in tropical, subtropical and temperate waters in most oceans.Mollusca: A phylum of the kingdom Metazoa. Mollusca have soft, unsegmented bodies with an anterior head, a dorsal visceral mass, and a ventral foot. Most are encased in a protective calcareous shell. It includes the classes GASTROPODA; BIVALVIA; CEPHALOPODA; Aplacophora; Scaphopoda; Polyplacophora; and Monoplacophora.Decapodiformes: A superorder of CEPHALOPODS comprised of squid, cuttlefish, and their relatives. Their distinguishing feature is the modification of their fourth pair of arms into tentacles, resulting in 10 limbs.Animal Structures: Organs and other anatomical structures of non-human vertebrate and invertebrate animals.Luminescence: Emission of LIGHT when ELECTRONS return to the electronic ground state from an excited state and lose the energy as PHOTONS. It is sometimes called cool light in contrast to INCANDESCENCE. LUMINESCENT MEASUREMENTS take advantage of this type of light emitted from LUMINESCENT AGENTS.Penis: The external reproductive organ of males. It is composed of a mass of erectile tissue enclosed in three cylindrical fibrous compartments. Two of the three compartments, the corpus cavernosa, are placed side-by-side along the upper part of the organ. The third compartment below, the corpus spongiosum, houses the urethra.Ctenophora: Phylum of marine colenterates characterized by eight comb rows of fused cilia on the body surface. In contrast to CNIDARIA they lack stinging cells, but they are voracious predators and possess sticky cells (colloblasts) for capturing prey. Most species are transparent and many exhibit bioluminescence.Sharks: A group of elongate elasmobranchs. Sharks are mostly marine fish, with certain species large and voracious.Phylogeny: The relationships of groups of organisms as reflected by their genetic makeup.Loligo: A genus of SQUID in the family Loliginidae, superorder DECAPODIFORMES, with a spindle-shaped body. They are well-studied, common inshore squids of the Atlantic and eastern Pacific Oceans, but their various species are taxonomically unresolved.Alcian Blue: A copper-containing dye used as a gelling agent for lubricants, for staining of bacteria and for the dyeing of histiocytes and fibroblasts in vivo.Salivary Glands: Glands that secrete SALIVA in the MOUTH. There are three pairs of salivary glands (PAROTID GLAND; SUBLINGUAL GLAND; SUBMANDIBULAR GLAND).Digestive System Neoplasms: Tumors or cancer of the DIGESTIVE SYSTEM.Digestive System Diseases: Diseases in any part of the GASTROINTESTINAL TRACT or the accessory organs (LIVER; BILIARY TRACT; PANCREAS).Coral Reefs: Marine ridges composed of living CORALS, coral skeletons, calcareous algae, and other organisms, mixed with minerals and organic matter. They are found most commonly in tropical waters and support other animal and plant life.Anthozoa: A class in the phylum CNIDARIA, comprised mostly of corals and anemones. All members occur only as polyps; the medusa stage is completely absent.Petrolatum: A colloidal system of semisolid hydrocarbons obtained from PETROLEUM. It is used as an ointment base, topical protectant, and lubricant.Fisheries: Places for cultivation and harvesting of fish, particularly in sea waters. (from McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)Medical Illustration: The field which deals with illustrative clarification of biomedical concepts, as in the use of diagrams and drawings. The illustration may be produced by hand, photography, computer, or other electronic or mechanical methods.Isopoda: One of the largest orders of mostly marine CRUSTACEA, containing over 10,000 species. Like AMPHIPODA, the other large order in the superorder Peracarida, members are shrimp-like in appearance, have sessile compound eyes, and no carapace. But unlike Amphipoda, they possess abdominal pleopods (modified as gills) and their bodies are dorsoventrally flattened.Polychaeta: A class of marine annelids including sandworms, tube worms, clamworms, and fire worms. It includes also the genus Myxicola infundibulum.Encyclopedias as Topic: Works containing information articles on subjects in every field of knowledge, usually arranged in alphabetical order, or a similar work limited to a special field or subject. (From The ALA Glossary of Library and Information Science, 1983)Predatory Behavior: Instinctual behavior pattern in which food is obtained by killing and consuming other species.Polyplacophora: A class in the phylum MOLLUSCA comprised of flattened, elongated marine mollusks, commonly called chitons. They are unique in that they possess seven or eight separate shell plates.Moon: The natural satellite of the planet Earth. It includes the lunar cycles or phases, the lunar month, lunar landscapes, geography, and soil.Hydrocharitaceae: A plant family of the order Hydrocharitales, subclass ALISMATIDAE, class Liliopsida (monocotyledons).Sex Characteristics: Those characteristics that distinguish one SEX from the other. The primary sex characteristics are the OVARIES and TESTES and their related hormones. Secondary sex characteristics are those which are masculine or feminine but not directly related to reproduction.Thoracica: A superorder of marine CRUSTACEA, free swimming in the larval state, but permanently fixed as adults. There are some 800 described species, grouped in several genera, and comprising of two major orders of barnacles: stalked (Pedunculata) and sessile (Sessilia).MedlinePlus: NATIONAL LIBRARY OF MEDICINE service for health professionals and consumers. It links extensive information from the National Institutes of Health and other reviewed sources of information on specific diseases and conditions.Body Size: The physical measurements of a body.Sperm Whale: The species Physeter catodon (also called Physeter macrocephalus), in the family Physeteridae. The common name is derived from the milky wax substance in its head (spermaceti). The species also produces an intestinal secretion AMBERGRIS, which was previously used in perfumes. The sperm whale is the largest toothed MAMMAL in the world.MuseumsExpeditions: Usually refers to planned scientific data-gathering excursions.Unedited FootageCestoda: A subclass of segmented worms comprising the tapeworms.HydrocarbonsCopyright: It is a form of protection provided by law. In the United States this protection is granted to authors of original works of authorship, including literary, dramatic, musical, artistic, and certain other intellectual works. This protection is available to both published and unpublished works. (from Circular of the United States Copyright Office, 6/30/2008)Computer Security: Protective measures against unauthorized access to or interference with computer operating systems, telecommunications, or data structures, especially the modification, deletion, destruction, or release of data in computers. It includes methods of forestalling interference by computer viruses or so-called computer hackers aiming to compromise stored data.Confidentiality: The privacy of information and its protection against unauthorized disclosure.Privacy: The state of being free from intrusion or disturbance in one's private life or affairs. (Random House Unabridged Dictionary, 2d ed, 1993)Licensure: The legal authority or formal permission from authorities to carry on certain activities which by law or regulation require such permission. It may be applied to licensure of institutions as well as individuals.Genetic Privacy: The protection of genetic information about an individual, family, or population group, from unauthorized disclosure.Health Policy: Decisions, usually developed by government policymakers, for determining present and future objectives pertaining to the health care system.Marine Biology: The study of the origin, structure, development, growth, function, genetics, and reproduction of organisms which inhabit the OCEANS AND SEAS.Scyphozoa: The class of true jellyfish, in the phylum CNIDARIA. They are mostly free-swimming marine organisms that go through five stages in their life cycle and exhibit two body forms: polyp and medusa.ChileZoology: The study of animals - their morphology, growth, distribution, classification, and behavior.Atlantic OceanBacteriology: The study of the structure, growth, function, genetics, and reproduction of bacteria, and BACTERIAL INFECTIONS.

A tyrosine-rich domain within homeodomain transcription factor Nkx2-5 is an essential element in the early cardiac transcriptional regulatory machinery. (1/33)

Homeodomain factor Nkx2-5 is a central component of the transcription factor network that guides cardiac development; in humans, mutations in NKX2.5 lead to congenital heart disease (CHD). We have genetically defined a novel conserved tyrosine-rich domain (YRD) within Nkx2-5 that has co-evolved with its homeodomain. Mutation of the YRD did not affect DNA binding and only slightly diminished transcriptional activity of Nkx2-5 in a context-specific manner in vitro. However, the YRD was absolutely essential for the function of Nkx2-5 in cardiogenesis during ES cell differentiation and in the developing embryo. Furthermore, heterozygous mutation of all nine tyrosines to alanine created an allele with a strong dominant-negative-like activity in vivo: ES cell<-->embryo chimaeras bearing the heterozygous mutation died before term with cardiac malformations similar to the more severe anomalies seen in NKX2.5 mutant families. These studies suggest a functional interdependence between the NK2 class homeodomain and YRD in cardiac development and evolution, and establish a new model for analysis of Nkx2-5 function in CHD.  (+info)

On the depth and scale of metabolic rate variation: scaling of oxygen consumption rates and enzymatic activity in the Class Cephalopoda (Mollusca). (2/33)

Recent ecological theory depends, for predictive power, on the apparent similarity of metabolic rates within broad taxonomic or functional groups of organisms (e.g. invertebrates or ectotherms). Such metabolic commonality is challenged here, as I demonstrate more than 200-fold variation in metabolic rates independent of body mass and temperature in a single class of animals, the Cephalopoda, over seven orders of magnitude size range. I further demonstrate wide variation in the slopes of metabolic scaling curves. The observed variation in metabolism reflects differential selection among species for locomotory capacity rather than mass or temperature constraints. Such selection is highest among epipelagic squids (Lolignidae and Ommastrephidae) that, as adults, have temperature-corrected metabolic rates higher than mammals of similar size.  (+info)

A model biological neural network: the cephalopod vestibular system. (3/33)

Artificial neural networks (ANNs) have become increasingly sophisticated and are widely used for the extraction of patterns or meaning from complicated or imprecise datasets. At the same time, our knowledge of the biological systems that inspired these ANNs has also progressed and a range of model systems are emerging where there is detailed information not only on the architecture and components of the system but also on their ontogeny, plasticity and the adaptive characteristics of their interconnections. We describe here a biological neural network contained in the cephalopod statocysts; the statocysts are analogous to the vertebrae vestibular system and provide the animal with sensory information on its orientation and movements in space. The statocyst network comprises only a small number of cells, made up of just three classes of neurons but, in combination with the large efferent innervation from the brain, forms an 'active' sense organs that uses feedback and feed-forward mechanisms to alter and dynamically modulate the activity within cells and how the various components are interconnected. The neurons are fully accessible to physiological investigation and the system provides an excellent model for describing the mechanisms underlying the operation of a sophisticated neural network.  (+info)

Ethics and invertebrates: a cephalopod perspective. (4/33)

This paper first explores 3 philosophical bases for attitudes to invertebrates, Contractarian/Kantian, Utilitarian, and Rights-based, and what they lead us to conclude about how we use and care for these animals. We next discuss the problems of evaluating pain and suffering in invertebrates, pointing out that physiological responses to stress are widely similar across the animal kingdom and that most animals show behavioral responses to potentially painful stimuli. Since cephalopods are often used as a test group for consideration of pain, distress and proper conditions for captivity and handling, we evaluate their behavioral and cognitive capacities. Given these capacities, we then discuss practical issues: minimization of their pain and suffering during harvesting for food; ensuring that captive cephalopods are properly cared for, stimulated and allowed to live as full a life as possible; and, lastly, working for their conservation.  (+info)

Cephalopod dynamic camouflage: bridging the continuum between background matching and disruptive coloration. (5/33)

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Mechanisms and behavioural functions of structural coloration in cephalopods. (6/33)

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Stable isotopes document the trophic structure of a deep-sea cephalopod assemblage including giant octopod and giant squid. (7/33)

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Do cephalopods communicate using polarized light reflections from their skin? (8/33)

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According to most specialists, the dearth of information on oceanic cephalopods reflects the inability of present day sampling equipments to catch them, since stomach content analyses of their predators suggest that they are very abundant along the water column. Stomach analyses, however, have an important inherent problem that should be taken into account when addressing this hypothesis. Cephalopod flesh digests more quickly than fish flesh and, in most cases, the identification of cephalopod remains is done from beaks, which are difficult to digest and may accumulate for long times in the stomachs. Such beak accumulations obviously bring forth an overestimation of the importance of cephalopods in the predators diet. With the expectation of determining if pelagic cephalopod abundances in the Mediterranean are in agreement with inferences from teutophagous predators diet, we analysed the structure and dynamics of cephalopod assemblages at different bathymetric strata from the surface to bottom ...
Ammonoid: Ammonoid, any of a group of extinct cephalopods (of the phylum Mollusca), forms related to the modern pearly nautilus (Nautilus), that are frequently found as fossils in marine rocks dating from the Devonian Period (began 419 million years ago) to the Cretaceous Period (ended 66 million years ago).
Within the Mollusca, cephalopods diverged from a monoplacophoran-like ancestor over 500 million years ago, later branching into the extant clades Nautiloidea (Nautilus and Allonautilus) and Coleoidea (squid, cuttlefish and octopus) [2,42-44]. The CephSeq Consortium has come together with the intention of using strategic genomic and transcriptomic sequencing of key cephalopod species to address previously unanswerable questions about this group. Taking into account the challenges of cephalopod genome sequencing, as well as the necessity to address nodal taxa, we have identified a set of species on which to focus our initial efforts. Selected species have been chosen based on the curiosity of their biological features as well as the possible advantages of their practical use. These species also cover ecologically diverse life histories, representing benthic, nectobenthic and nectonic animals.. Cephalopods are animals with advanced cognitive skills and a complex repertoire of behavioral abilities ...
As a squid biologist, I have always been a huge fan of living cephalopods, but their shelled ancestors never piqued my interest before I picked up Danna Staafs Squid Empire. Thanks, in part, to her unbridled enthusiasm, by the end of the book, I found myself actively rooting for animals that I had previously only thought about as fossils.. Early cephalopods used horn-shaped chambered shells to control their buoyancy, allowing them to bob and float above the seafloor. The resulting mobility allowed them to evade predators and capture prey. With an abundant amount of food available and a lack of competition, cephalopods flourished, growing to enormous sizes. (Fossils as long as 3.5 meters dating from the Ordovician have been discovered in Iowa.). Cephalopod evolution is a fantastic subject for lovers of drama: The moment the protagonist appears to be done for, a narrow escape ensues. When fishes developed jaws, cephalopods countered with beaks. When fishes became faster swimmers, cephalopods ...
TY - CHAP. T1 - Environmental Effects on Cephalopod Population Dynamics. T2 - Implications for Management of Fisheries. AU - Rodhouse, Paul G. K.. AU - Pierce, Graham J.. AU - Nichols, Owen C.. AU - Sauer, Warwick H. H.. AU - Arkhipkin, Alexander I.. AU - Laptikhovsky, Vladimir V.. AU - Lipinski, Marek R.. AU - Ramos, Jorge E.. AU - Gras, Michael. AU - Kidokoro, Hideaki. AU - Sadayasu, Kazuhiro. AU - Pereira, Joao. AU - Lefkaditou, Evgenia. AU - Pita, Cristina. AU - Gasalla, Maria. AU - Haimovici, Manuel. AU - Sakai, Mitsuo. AU - Downey, Nicola. PY - 2014. Y1 - 2014. N2 - Cephalopods are a relatively small class of molluscs (similar to 800 species), but they support some large industrial scale fisheries and numerous small-scale, local, artisanal fisheries. For several decades, landings of cephalopods globally have grown against a background of total finfish landings levelling off and then declining. There is now evidence that in recent years, growth in cephalopod landings has declined. The ...
PBS has a great video up about the evolution of camera eyes, from their documentary, Evolution: Darwins Dangerous Idea. Using a synthetic optical demonstration and examples from nature, Dan-Eric Nilsson describes some of the selectable gradations between a flat patch of photosensitive cells and a fully functional camera eye. Camera eyes, also called simple lens…
An exceptionally well-preserved fauna from a new exposure in the Peterborough Member (Oxford Clay Formation) of southern England, equivalent to the famous and now inaccessible Lagerstatte at Christian Malford, Wiltshire, is described. It comes from a single bed and includes coleoid cephalopods with phosphatized soft tissues, and fully articulated fish. The level is unusual in that it lacks permanent benthos and is dominated by rain-out from the upper water column. It was deposited on a sea floor that experienced prolonged periods of anoxia and which was overlain by a water column that was at least intermittently stratified. It is postulated that the coleoids formed large shoals that were killed en masse, together with other elements of the associated fauna, in one or more catastrophic mass mortality events that affected a significant area of the Peterborough Member sea. During the event(s), many of the coleoids preyed upon moribund fish and other coleoids, sometimes of the same species, before ...
The traditional view of cephalopod evolution holds that they evolved in the Late Cambrian from a monoplacophoran-like ancestor[88] with a curved, tapering shell,[89] which was closely related to the gastropods (snails).[90] The similarity of the early shelled cephalopod Plectronoceras to some gastropods was used in support of this view. The development of a siphuncle would have allowed the shells of these early forms to become gas-filled (thus buoyant) in order to support them and keep the shells upright while the animal crawled along the floor, and separated the true cephalopods from putative ancestors such as Knightoconus, which lacked a siphuncle.[90] Neutral or positive buoyancy (i.e. the ability to float) would have come later, followed by swimming in the Plectronocerida and eventually jet propulsion in more derived cephalopods.[91]. However, some morphological evidence is difficult to reconcile with this view, and the redescription of Nectocaris pteryx, which did not have a shell and ...
Lindgren, A.R. 2010. Systematics and distribution of the squid genus Pterygioteuthis (Cephalopoda: Oegopsida) in the eastern tropical Pacific Ocean. Nesis, K.N. 1973. Cephalopods of the eastern equatorial and south-eastern Pacific Ocean (in Russian). In: English translations of selected publications on Cephalopods by Kir Nesis. Vol. I (M.J. Sweeney, compiler), pp. 171-248. Smithsonian Institution Libraries, Aad Publications, Karachi.. Okutani, T. 1974. Epipelagic decapod cephalopods collected by midwater tows during the EASTROPAC Expedition, 1967-1968 (systematic part). Bull. Tokai Reg. Fisheries Res. Lab. 80:29-118.. Pfeffer, G. 1912. Die Cephalopoden der Plankton-Expedition. Ergebnisse der Plankton-Expedition der Humboldt-Stiftung. 2: 1-815.. Riddell, D.J. 1985. Enoploteuthidae of the New Zealand Region. Fish. Res. Bull., New Zealand. 27:1-52.. Young, R.E. 1972. The systematics and areal distribution of pelagic cephalopods from the seas off southern California. Smith. Contr. Zool. ...
Examples of cephalopds Pain in cephalopods is a contentious issue. Pain is a complex mental state, with a distinct perceptual quality but also associated with suffering, which is an emotional state. Because of this complexity, the presence of pain in non-human animals, or another human for that matter, cannot be determined unambiguously using observational methods, but the conclusion that animals experience pain is often inferred on the basis of likely presence of phenomenal consciousness which is deduced from comparative brain physiology as well as physical and behavioural reactions. Cephalopods are complex invertebrates, often considered to be more "advanced" than other invertebrates. They fulfill several criteria proposed as indicating that non-human animals may be capable of perceiving pain. These fulfilled criteria include having a suitable nervous system and sensory receptors, opioid receptors, reduced responses to noxious stimuli when given analgesics and local anaesthetics used for ...
Here we present evidence for a semi-sessile early juvenile stage of ammonites. Our hypothesis is based on fossil evidence in early diagenetic limestone concretions discovered in platy limestone deposits of Cenomanian age in the northern state of Coahuila, Mexico. In these locations densely packed post-embryonic shell assemblages were attached to fossilized algal or bacterial mats and preserved in sediments deposited under permanently anoxic bottom conditions. Tiny ammonites, as well as gastropods and byssate pectinid bivalves are abundant and restricted to these mats. They do not occur elsewhere in the sediment. The ammonite hatchlings were apparently unable to escape from mats sinking to the hostile sea floor and must thus have been semi-sessile, similar to the associated gastropods and bivalves ...
Is the Casper octopod at risk from underwater mining? Learn more about the Casper octopod and the risk mining poses in this HowStuffWorks Now article.
by Matthew Cobb Last year we discussed one of the questions I routinely ask my students - why are there no insects in the sea? Todays poser is a question a student, Xaali, recently asked me: Why are there no freshwater cephalopods? Now I dont know much about molluscs (arthropods are more my bag), but the…
Dunning, M. C. 1998. Ommastrephidae. In: Carpenter, K.E.; Niem, V.H. (eds) FAO species identification guide for fishery purposes.The living marine resources of the Western Central Pacific. Volume 2. Cephalopods, crustaceans,holothurians and sharks. Rome, FAO. 1998. 687-1396 p.. Pfeffer, G. 1912. Die Cephalopoden der Plankton-Expedition. Ergebniss der Plankton-Expedition der Humboldt-Stiftung. 2: 1-815.. Roper, C. F. E, Nigmatulin, C. and P. Jereb. 2010. P. 345-347. In: Jereb. P; Roper, C.F.E (eds). Cephalopoda of the world. An annotated and illustrated catalogue of cephalopod species known to date. Vol. 2. Myopsid and Oegopsid Squids. FAO Species Catalogue for Fishery Purposes. No. 4, Vol.2. Rome, FAO. 2010. ...
additional source Norman M.D. & Finn J.K. (2014). Family Vampyroteuthidae. pp. 268-270, in P. Jereb, C.F.E. Roper, M.D. Norman & J.K. Finn eds. Cephalopods of the world. An annotated and illustrated catalogue of cephalopod species known to date. Volume 3. Octopods and Vampire Squids. FAO Species Catalogue for Fishery Purposes [Rome, FAO]. 4(3): 353 pp. 11 pls ...
Finn J.K. (2014). Family Tremoctopodidae. pp. 240-243, in P. Jereb, C.F.E. Roper, M.D. Norman & J.K Finn eds. ,i,Cephalopods of the world. An annotated and illustrated catalogue of cephalopod species known to date,/i,. Volume 3. Octopods and Vampire Squids. ,em,FAO Species Catalogue for Fishery Purposes [Rome, FAO].,/em, 4(3): 353 pp. 11 pls ...
ABSTRACT. A new heteromorph ammonite genus, Tarrantites, is proposed for Hamites adkinsi Scott, 1928. The description of the new genus is based mainly on a near-complete specimen from the Middle Albian part of the Goodland Limestone of Tarrant County, Texas, the holotype, and on an abraded mould on a pebble from the bed of a stream in Hill County, Texas. In addition, we record the presence of the genus in the Albian of Pakistan. Tarrantites shows a remarkable resemblance to the labeceratine genera Labeceras Spath, 1925 and Myloceras Spath, 1925: in coiling and size to the former, and in ornamentation to the latter, but is excluded from the subfamily Labeceratinae Spath, 1925, because it has a distinct bifid adventive (A) lobe. This latter feature, and the ornamentation, rather suggest affinities of Tarrantites with the family Anisoceratidae Hyatt, 1900.. Keywords: Albian, heteromorph ammonite, Tarrantites, Anisoceratidae, labeceratine homoeomorph, Texas, Pakistan.. ...
ABOUT THIS ITEM ================= Dynamite! This Ammonite is for you! Look at that Center! Cant take your eyes off that fantastic Ammonite Fossil center. The color pallet of browns and soft yellows are perfect for a basket. The 6 Black Walnut slices in a triangular shape adds texture to this
Plectronoceras in an excellent place to start, even for the whole shabang, being the oldest known cephalopod, known from as early as the Franconian, lower Yenchou, of China. I added the Ellesmerocerida which are the root stock of all post Cambrian cephalopods. The Endocerida and Actinocerida are shown slightly differently to allow for the added Orthocerida. All three are independently derived from the Ellesmerocerida. The Orthocerida provides a place for the Bactrida to attach. Stemming from the Bactida are three independent groups, the Ammonidea, Aulacocerida (Belemnoidea) , and Coleoidea. The line of direct decent from the Ellesmerocerida continues to the Nautilida, which along with the Coleoidea contains the most recent cephalopods ...
Ammonoid evolutionary changes have long been recognized to be excellent time markers. They are the major macrofossil group to date and correlate Paleozoic and Mesozoic marine strata. Originations and...
It is widely accepted that the effects of global sea-level changes at the transition from the Devonian to the Carboniferous are recorded in deposits on the shelf of northern Gondwana. These latest Devonian strata had been thought to be poor in fossils due to the Hangenberg mass extinction. In the Mader (eastern Anti-Atlas), however, the Hangenberg Black Shale claystones (latest Famennian) are rich in exceptionally preserved fossils displaying the remains of non-mineralized structures. The diversity in animal species of these strata is, however, low. Remarkably, the organic-rich claystones have yielded abundant remains of Ammonoidea preserved with their jaws, both in situ and isolated. This is important because previously, the jaws of only one of the main Devonian ammonoid clades had been found (Frasnian Gephuroceratina). Here, we describe four types of jaws of which two could be assigned confidently to the Order Clymeniida and to the Suborder Tornoceratina. These findings imply that chitinous ...
According to modern studies, Lituitids are not Tarphyceridans, but a separate order (Lituitida), closely related with Orthocerida. For example: Kröger B., Servais T., Zhang Y. 2009. The origin and initial rise of pelagic cephalopods in the Ordovician. They are differ from Tarphycerids by the structure of embryonic shell and muscle scars. ...
Squid, whose real name is Wu Quarry Bay, also known as squid, cuttlefish or squid,the squid cephalopod Mollusca purpose animal. Squid will encounter enemies in order to "jet" as a way to escape, waiting for an opportunity to leave, hence the "squid", "squid" and other names. Pigment in their skin a small capsule will with the"emotional" and change color and size. ...
Some ammonites have been found in association with a single horny plate or a pair of calcitic plates. In the past, these plates were assumed to serve in closing the opening of the shell in much the same way as an operculum, but more recently, they are postulated to have been, instead, a jaw apparatus.[6][7][8][9]. The plates are collectively termed the aptychus or aptychi in the case of a pair of plates, and anaptychus in the case of a single plate. The paired aptychi were symmetric to one another and equal in size and appearance. Anaptychi are relatively rare as fossils. They are found representing ammonites from the Devonian period through those of the Cretaceous period. Calcified aptychi only occur in ammonites from the Mesozoic era. They are almost always found detached from the shell, and are only very rarely preserved in place. Still, sufficient numbers have been found closing the apertures of fossil ammonite shells as to leave no doubt as to their identity as part of the anatomy of an ...
SPECTACULAR GEM AMMONITE Placenticeras intercalare Cretaceous Bearpaw Formation, Southern Alberta, Canada A huge - Available at 2011 June Dallas Signature...
Scientists at the American Museum of Natural History and Stony Brook University have demonstrated a new way to calculate the temperature of the ocean 80 million years ago: through the jaws of ammonites.
Cephalopods such as octopuses, squid and cuttlefish are the most intelligent invertebrates, capable of using tools, unscrewing jars and outsmarting researchers.
Brian Fry, who did all that excellent work characterizing and cataloging the pharmacy of venoms secreted by poisonous snakes, has also turned his hand to the cephalopods. He examined the products of the venom glands of octopus, squid, and cuttlefish, and found a range of proteins, some unique, and others familiar: CAP (a CRISP protein), chitinase, peptidase S1, PLA2 and others. There are a couple of interesting lessons in that list.. First, evolution doesnt just invent something brand new on the spot to fill a function - what we find instead is that existing proteins are repurposed to do a job. This is how evolution generally operates, taking what already exists and tinkering and reshaping it to better fulfill a useful function. Phospholipase A2, for instance, is a perfectly harmless and extremely useful non-venomous protein in many organisms - we non-toxic humans also make it. We use it as a regulatory signal to control the inflammation response to infection and injury - in moderation, its a ...
Download cephalopod, fishes, ocean life, octopus, sea, sea creature icon in .PNG or .ICO format. Icon designed by Yu Luck found in the icon set Ocean life Part-1
Ive been stumped on this on google scholar (maybe because I dont know the right keywords): What determines sex in cephalopods. I know some molluscs are...
Scientific studies have tried to isolate personality traits and apply them to cephalopods. The definition appears to be the display of individual...
How hard is it to keep a cephalopod as a pet anyway? Have you ever been tempted PZ? We all know how you feel about your pet cat.. ...
Baculites, genus of extinct cephalopods (animals related to the modern squid, octopus, and nautilus) found as fossils in Late Cretaceous marine rocks (formed from 99.6 million to 65.5 million years ago). Baculites, restricted to a narrow time range, is an excellent guide or index fossil for Late
Cephalopods (from the Greek words képhalé, head and podos, foot) are a class of invertebrate animals that belong to the Mollusca phylum. According to the Tree of Life Project, there are two groups...
New research from MIT and Israel suggests that the central dogma of genetics may not apply to some cephalopods due to their editing of RNA.
Donor challenge: A generous supporter will match your donation 3 to 1 right now. Triple your impact! Dear Internet Archive Supporter,. I ask only once a year: please help the Internet Archive today. Were an independent, non-profit website that the entire world depends on. Most cant afford to donate, but we hope you can. If everyone chips in $50, we can keep this going for free. For the price of a couple books, we can share those books online forever. When I started this, people called me crazy ...
The following basically follows Teichert (1988) except that Teicherts two Subclasses Endoceratoidea and Actinoceratoidea have been discarded, since the two orders [[Endocerida]] and [[Actinocerida]] are not so distinct from their contemporaries as to justify such a high taxonomic ranking ...
Within the Phylum Mollusca, cephalopods encompass a small and complex group of exclusively marine animals that live in all the oceans of the world with the exception of the Black and Caspian seas. They are distributed from shallow waters down into the deep sea, occupying a wide range of ecological niches. They are dominant predators and themselves prey with high visual capability and well-developed vestibular, auditory, and tactile systems. Nevertheless, their perceptions are chemically facilitated, so that water-soluble and volatile odorants are the key mediators of many physiological and behavioral events.. For cephalopods as well as the other aquatic animals, chemical cues convey a remarkable amount of information critical to social interaction, habitat selection, defense, prey localization, courtship and mating, affecting not only individual behavior and population-level processes, but also community organization and ecosystem function. Cephalopods possess chemosensory systems that have ...
So today were all the final presentations given by the interns and I must say that Im pretty impressed!! All of the other groups did some pretty complicated stuff! All this talk of gadolinium and DIRSIG really made me stop and think. It also made me realize that Helen and I have had it pretty easy working for the color and ophthalmology labs here at RIT. I mean all we did w2as take pictures and analyze them while other people were out building bridges and actual stars! This internship was a lot of fun and now that I realize just how much intensive work that we could have been put through, I really cherish all of the fun, easy going tasks that we were given to do. I really dont want to have to go out and get an actual job with actual manual labor ...
The peaks in the reflectivity spectrum of waveguide gratings observed when the incident beam couples to a mode of the structure are promising features for many applications. However their weak angular tolerance and their strong polarization sensitivity, especially under oblique incidence, limit their interest in practice. These problems can be overcome by forming slow degenerate modes outside the usual high symmetry points of the Brillouin zone with a complex periodic pattern [ Fehrembach, Appl. Phys. Lett. 86, 121105 (2005) ]. We show experimentally that spectrally sharp, ...
Ammolite is a fossilized shell of a sea creature that lived back in the time of the dinosaurs, over 400 Million Years ago !! 14 K rolled gold $69
Ever since recorded history began, and probably before, people have noticed and gathered fossils, including pieces of rock and minerals that have replaced the remains of biologic organisms, or preserved their external form. Fossils themselves, and the totality of their occurrence within the sequence of Earths rock strata, is referred to as the fossil record. The fossil...
This is an SSSI. There are no restrictions to visit this area, but you must not hammer the bedrock. Look around until you find the exposed clay bedrock, among the boulder-strewn shoreline. Fossils are very obvious on the surface of this, but remember only to remove fossils on the surface or lying loose. The boulders contain many nodules that are full of bivalves, gastropods, fossilised wood fragments and other smaller remains.. Most of the zones are well represented with fossils. Flat compressed mother-of-pearl coated and pyrite ammonites can be found throughout all stages of the succession. However, they can be very difficult to preserve, so only remove one if you feel it can be saved. Cardioceras sp. seems to be the main species of ammonite. Belemnites are very easy to find here and bivalves are also present. There are also rich microfossil assemblages.. ...
The natural blind spot occurs where axons passing over the front of the retina converge to form the head of the optic nerve, and where retinal blood vessels enter and exit the eyeball, resulting in a hole in the photoreceptor mosaic. Natural blind spots are present only in the eyes of vertebrates; cephalopods, such as octopus, more rationally have retinal axons that pass over the back of the retina, so the optic nerve does not have to pass through the photoreceptor layer to exit the eye. These differences reflect the different origins of vertebrate and cephalopod eyes: invertebrate eyes develop from the skin whereas vertebrate eyes, including human eyes, are outgrowths from the brain and apparently reversal was embryologically impossible. Human eyes are irrational as the light has to go through the blood vessels and nerve fibres before reaching the retina. The blood vessels especially can be seen by looking through a pinhole in a card and moving it back and forth. The shadows cast by the vessels ...
Sharks and turtles get a lot of love from divers, (and for good reason), but today were going to give some attention to our friend the squid. 2013 was a good year for squid enthusiasts - most notably the first video of a giant squid. There are more than 300 species […]. Read more › ...
Everything about the Triassic period points to divine involvement. Let me ask you this: Could some kind of random genetic chance make the population of shelled cephalopods grow significantly? No, of course not. So the only logical explanation is that there was an infinite and all-knowing cephalopod creator who modified their mollusk foot into a muscular hydrostat that eventually, on the sixth day, became a tentacle.". ...
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Because the genus was only known from a single specimen, Conway Morris was unable to deduce its affinity. It had some features which were reminiscent of the arthropods, but these could well have been convergently derived. Its fins were very unlike the arthropods. Working from photographs, the Italian palaeontologist Alberto Simonetta believed he could classify Nectocaris within the chordates. He focussed mainly on the tail and fin morphology, interpreting Conway Morriss gut as a notochord - a distinctive chordate feature. However, his case was unconvincing, and its classification remained uncertain until 2010, when Martin Smith and Jean-Bernard Caron described 91 additional specimens, many better preserved than the type. These allowed them to reinterpret Nectocaris as a primitive cephalopod, with two tentacles instead of the 8 or 10 of modern cephalopods. The structure previous researchers had identified as an oval carapace or shield behind the eyes was shown to actually be a soft funnel, ...
Hybridoma technology is used to fuse fusion a B cell and myeloma to form a hybridoma that produces identical monoclonal antibodies.
Attribution - You must give appropriate credit and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.. NonCommercial - You may not use the material for commercial purposes.. ShareAlike - If you remix, transform, or build upon the material, you must distribute your contributions under the same license as the original.. ...
I am seeking collaborations - email me or give me a call for sales queries, if you want to have a chat about my work or collaborate on a project ...
The central dogma of molecular biology and genetics is pretty straightforward. You take DNA, then you transcribe the desired gene into RNA (usually mRNA) and, once outside of the nucleus, you translate that RNA using ribosomes into amino acids that then form proteins. Those proteins then do the actual function that their original genetic encoding […]. ...
Hi, I am writing code for camera control within a skeletal glut program that already has key press capability. It will be modeled after FPS shooter movement schemes. Starting with gluLookAt(Ex,Ey,Ez,Ox,Oy,Oz,0,1,0) how do I create a camera eye and virtual object position that will represent forward. Once I learn this direction I can go to the others.
Like many cephalopods, octopuses have three hearts. Two pump blood through its gills, and a third pumps blood through its body to its organs. The hearts reportedly stop when the octopus swims. And because its blood uses hemocyanin to move oxygen rather than hemoglobin (like our blood uses), its blood is blue.. And … thats about all I have to say about the octopus circulatory system. Ive tried to come up with a way to expand these fascinating (and at least to me, awe-inspiring) facts into a bona fide article for The Behemoth. But I dont have much more to say after noting those details. Some things are just too short for our "small magazine about a big God and his big world.". And some things are too long. We regularly struggle with getting fascinating stories (especially about science) down to our ideal word counts.. This issue, were making an exception to our usual rules so that we can bring you Josh Jeters visit to Mount Athos. Travel writing-especially Christian travel writing-is one of ...
Extensive messenger RNA editing generates transcript and protein diversity in genes involved in neural excitability, as previously described, as well as in genes participating in a broad range of other cellular functions. We identified hundreds of cephalopod-specific genes, many of which showed elevated expression levels in such specialized structures as the skin, the suckers and the nervous system. Finally, we found evidence for large-scale genomic rearrangements that are closely associated with transposable element expansions. Our analysis suggests that substantial expansion of a handful of gene families, along with extensive remodelling of genome linkage and repetitive content, played a critical role in the evolution of cephalopod morphological innovations, including their large and complex nervous systems ...
H5983 - עַמּוֹן ʻAmmôwn, am-mone; from ; tribal, i.e. inbred; Ammon, a son of Lot; also his posterity and their country:-Ammon, Ammonites.
o †Ammonoidea Zittel, 1884 (ammoniitit; ammonites) ,--o †Anacestida , ,?- †Gyroceratites , ,?- †Paraphyllites , ,?- †Prolobites , ,--o †Anarcestina , , ,?- †Anarcestes , , ,?- †Maenioceras , , ,-- †Prolobitoidea [Prolobitaceae] , , `-- †Anarcestoidea [Anarcestaceae] , `--o †Gephuroceratina , ,?- †Manticoceras , ,-- †Gephuroceratoidea [Gephurocerataceae] , `-- †Pharciceratoidea [Pharcicerataceae] ,?-o †Clymeniida , ,?- †Cyrtoclymenia , ,?- †Epiwocklumeria , ,--o Platyclymeniina [Glymeniina] , , `--o †Clymeniina [Pharcicerataceae] , , `--o †Clymenoidea [Clymeniaceae] , , ,-- †Clymenia , , `-- †Platyclymenia , `--o †Gonioclymeniina , ,?- †Wocklumeria , ,--o †Gonioclymenoidea [Gonioclymeniaceae] , , `-- †Gonioclymenia , `--o †Parawocklumeriaceae [Parawocklumeroidea] , `-- †Parawocklumeria `--+-- †Goniatitida Hyatt, 1884 `--o †Prolecanitida [Prolecanitina] ,-- †Medlicottoidea [Medlicottiaceae] `--+==o †Prolecanitoidea [Prolecanitaceae] ...
For squid looking to sparkle, extra bling is only seconds away, thanks to a nerve network in the skin that allows these cephalopods to alter their iridescence - the first invertebrate creatures found to have this ability.
basis of record Roper, C. F. E.; Jereb, P. (2010). Family Promachoteuthidae. In: P. Jereb & C.F.E. Roper, eds. Cephalopods of the world. An annotated and illustrated catalogue of species known to date. Volume 2. Myopsid and Oegopsid Squids. FAO Species Catalogue for Fishery Purposes. No. 4, Vol. 2. Rome, FAO. pp. 374-376., available online at http://www.fao.org/docrep/014/i1920e/i1920e.pdf [details] ...
Jereb, P., Vecchione, M. & Roper, C.F.E. (2010). Family Loliginidae. ,i,In,/i, P. Jereb & C.F.E. Roper, eds. ,i,Cephalopods of the world. An annotated and illustrated catalogue of species known to date. Volume 2. Myopsid and Oegopsid Squids,/i,. FAO Species Catalogue for Fishery Purposes. No. 4, Vol. 2. Rome, FAO. pp. 38-117 ...
ABSTRACT: Coleoid cephalopods (squid, cuttlefish, and octopus) have the largest and most complex brains of all invertebrates and show behavioral abilities similar to those of vertebrates. Among the coleoids, the oval squid Sepioteuthis lessoniana forms well-structured schools that are indicative of sociality. These behaviors are reflected in aspects of the well-developed brain. In this study, we focused on the role of the cephalopod brain in complex behavior. In order to reveal the network of γ-aminobutyric acid (GABA) in coleoids, we examined the immunohistochemical localization of glutamic acid decarboxylase (GAD), which is the synthetic enzyme of GABA, in the brain of young S. lessoniana. We found that GABAergic neurons and their axons were distributed throughout the brain. GABA neurons were abundantly localized in the inferior frontal lobe, which is involved in controlling arm motions, and in the subesophageal masses, which are lower and intermediate centers of action. GABAergic fibers were ...
Cephalopods possess the most complex centralized nervous system among molluscs and the molecular determinants of its development have only begun to be explored. To better understand how evolved their brain and body axes, we studied Sepia officinalis embryos and investigated the expression patterns of neural regionalization genes involved in the mediolateral patterning of the neuroectoderm in model species. SoxB1 expression reveals that the embryonic neuroectoderm is made of several distinct territories that constitute a large part of the animal pole disc. Concentric nkx2.1, pax6/gsx, and pax3/7/msx/pax2/5/8 positive domains subdivide this neuroectoderm. Looking from dorsal to ventral sides, the sequence of these expressions is reminiscent of the mediolateral subdivision in model species, which provides good evidence for "mediolateral patterning" conservation in cephalopods. A specific feature of cephalopod development, however, includes an unconventional orientation to this mediolateral ...
Find the fascicles article Description des rhyncholites des Nautiles (Mollusca, Cephalopoda) du Paléogène des bassins de Paris et dAquitaine et des Corbières (France) on the website of Scientific Publications of the Muséum national dHistoire naturelle, Paris
Adamo, S.A. & Hanlon, R.T. (1996). Do cuttlefish (Cephalopoda) signal their intentions to conspecifics during agonistic encounters? Animal Behaviour 52, 73-81.. Barata, E.N., Serrano, R.M., Miranda, A., Nogueira, R., Hubbard, P. C. & Canário, A.V.M. (2008). Putative pheromones from the anal glands of male blennies attract females and enhance male reproductive success. Animal Behaviour 75, 379-389.. Boal, J.G. (1997) Female choice of males in cuttlefish (Mollusca: Cephalopoda). Behaviour 134, 975-988.. Boal, J.G. (2006) Social recognition: A top down view of cephalopod behaviour. Vie et Milieu-Life and Environment 56, 69-79.. Boal, J.G. & Golden, D.K. (1999) Distance chemoreception in the common cuttlefish, Sepia officinalis (Mollusca, Cephalopoda). Journal of Experimental Marine Biology and Ecology 235, 307-317.. Chybicki, I.J. & Burczyk, J. (2009). Simultaneous estimation of null alleles and inbreeding coefficients. Journal of Heredity 100 (1), 106-113.. Conte, F.S. (2004). Stress and the ...
Octopuses can learn. They can make discriminations based on visual, tactile, and chemical cues. Octopus vulgaris keeps its home hidden. The females find a hole, a crevice or sheltered place ad they often protect their homes with shells, stones, and other solid objects they gather.. Members of this species are perfectly adapted to live in very different habitats. Their capacity to conceal themselves on any substrate by varying colour, skin, texture, and posture is challenged by few other cephalopod species. In the Catalonian Sea, more particularly in the area of Banyuls and Port Vendres, Octopus vulgaris seems to undergo seasonal migrations, mainly of vertical orientation. In the early spring, large animals move inshore for spawning. The females tend to disappear during the summer; they lay eggs, brood, and die. From late summer onwards, the largest size class consists mainly of males. They leave the coastal waters in autumn or early summer; at this time the males are mature, and the females at ...
Material: Ammonite. Region: Madagascar. It is not an antique but a symbol of ancient Chinese art as a collection, hope we can communicate with art and culture of ancient China. A great and significative collection or gift!
This site is part of the Jurassic World Heritage Coastline, so follow the Fossil Code of Conduct. This is an SSSI, so the use of hammers on the bedrock and cliffs is not allowed. In addition, the cliffs are extremely dangerous, so collecting directly from them is extremely inadvisable. However, fossils are found washed up on the foreshore and so hammers are not required.. The ammonite, Pavlovia rotunda can also be found flattened in the foreshore clays. We do not recommend collecting this ammonite, as it is too fragile and best left for others to see. Instead, try to find nodules (Rotunda Nodules), as these can contain superb ammonites, but these are not a common as they once were. However, large ammonites have been found loose, which have fallen out of boulders and many fragments can lie scattered along the beach.. If you carry on to Freshwater Steps, which is about 2.5km from the pool, the foreshore and cliff yields the crinoid Saccocoma, which is pyritised. Freshwater Steps is equal distance ...
Fuchs_et_al_2015_PZ.pdf @TqB @belemniten @PFOOLEY @DPS Ammonite and perhaps a host of others? The list of authors read like a whos who of "paleomalacology" /RECOMMENDED!!!!!! ___________________________________________________________________________ A nearly complete respiratory, circulatory, and excretory system preserved in small Late Cretaceous octopods (Cephalopoda) from Lebanon Dirk Fuchs • Philipp R. Wilby • Sigurd von Boletzky • Pierre Abi-Saad • Helmut Keupp • Yasuhiro Iba Palaontol Z. DOI 10.1007/s12542-015-0256-6 ...
Abaca (n.) The Manila-hemp plant (Musa textilis); also, its fiber. See Manila hemp under Manila.. Abigail (n.) A ladys waiting-maid.. Abreast (adv.) Side by side; also, opposite; over against; on a Abstain (v. i.) To hold ones self aloof; to forbear or refrain voluntarily, and especially from an indulgence of the passions or appetites; -- with from.. Acciaccatura (n.) A short grace note, one semitone below the note to which it is prefixed; -- used especially in organ music. Now used as equivalent to the short appoggiatura.. Acerate (a.) Acerose; needle-shaped.. Acetabular (a.) Cup-shaped; saucer-shaped; acetabuliform.. Acetabulifera (n. pl.) The division of Cephalopoda in which the arms are furnished with cup-shaped suckers, as the cuttlefishes, squids, and octopus; the Dibranchiata. See Cephalopoda.. Acetabuliform (a.) Shaped like a shallow cup; saucer-shaped; as, an acetabuliform calyx.. Acetanilide (n.) A compound of aniAchlamydate (a.) Not possessing a mantle; -- said of certain ...
The oegopsid squid Illex illecebrosus was selected for consideration by reason of the limited knowledge which surrounds the cellular elements of its blood and the potential significance these answers might have on its unique phylogeny. -- Standard blood smear preparations were utilized to define a working image of those elements, later to be described as eosinophilic granulocytes. Incorporated within this study was the application of Villanueva stain which, having imparted greater contrast between nucleus and cytoplasm, made microvideomat analysis possible. Relationships between selected nuclear configurations and their areas, selected nuclear configurations and the associated cytoplasmic areas, and thirdly, between the nuclear and cytoplasmic areas were derived from such data. -- Living preparations stained supravitally provided correlative information as to the nature and/or presence of cell organelles observed at the levels of light and electron microscopy. -- Experiments were devised to ...
Posterior salivary glands. As the gland described above, posterior salivary glands are simple branched tubular glands. They are covered by a connective capsule with muscular fibers surrounding the glandular tubules like thin connections. Each tubule presents two zones formed by different cells. The first or proximal zone (A) consists of globular mucous cells with flattened basal nuclei (Figure 5b). The supranuclear cytoplasm contains high level of PAS (+) and alcian blue (+) pH = 3.5, vesicles denoting the presence of weakly sulphated glycosaminoglycans content. Cylindrical cells with a basal spherical nucleus surrounded by a basophilic cytoplasm are also seen. The second or distal zone (B) present cylindrical cells characterized by its weakly eosinophilic cytoplasm. The nucleus with basal or apical location is observed (Figure 5b). The PAS (+) and Alcian Blue (-) pH = 3.5 reaction in the cytoplasm, suggests the presence of neutral carbohydrates.. Animals kept in the aquarium without food for ...
The Squid, Octopus, and Nautilus ClipArt gallery includes 132 illustrations of squid, octopus, nautilus, and ammonites. These animals are members of the mollusk (or mollusc) class of cephpalopods, named cephalopoda.. ...
The CR-2 Plus AF is an Auto focusing Non Mydriatic Camera with Fundus AutoFluorescence (FAF) With the added auto functions, taking images with a Canon retinal camera has never been easier! The FAF photography mode will provide information on changes of the retina that cant be made visible with standard colour photography. The 5 photography modes: Color, Red Free, Cobalt, FAF and Anterior Segment make the CR-2 Plus AF a very versatile retinal camera. It is equipped with a unique dedicated EOS camera for the highest image quality.. ...
by the way, when are you returning my shoe vest, its my favorite. and yes I am a celebrity....in my own head so, but seriously, no one has followed that rule Newsy put in red so I guess its a resistence now. try putting the rules in flashing banner graphics that scream at us Newsy ...
Fig. 4. Detailed views of the deeper-water carbonates (Units A, B, C) and the calcareous marls to marlstones of the Marlstone member from the Kasımlar Formation of the Aşağiyaylabel (AS I, AS IV) and Karapinar (KA I-II & IV) sections. Well-bedded Kasimlarceltites beds at the base of the Kasımlar Formation (Carbonate member, Unit A) at the sections (a) AS I, (b) AS IV, (c) KA I and (d) KA II. Julian/Tuvalian boundary (Lower/Upper Carnian boundary) at the carbonate/marl transitional intervals at the sections (e) AS I and (f) KA IV within the Kasımlar Formations at the top of Unit C, below the Marlstone member. (g) Characteristic marls of the Marlstone member (AS I) within the Kasımlar Formation bearing the abundant Tuvalian ammonoid Paratropites cf. hoetzendorfii. (h) Layer with accumulation of the bivalve Halobia and pyrite cubes within the Marlstone member from AS I. (i) Sandstone layer of the Marlstone member, AS I. (j) Breccia layer with shallow-water components within the Marlstone ...
The mantle cavity is a central feature of molluscan biology. This cavity is formed by the mantle skirt, a double fold of mantle which encloses a water space. This space contains the molluscs gills, anus, and organs for taste, excretion and reproductive organs. The mantle cavity functions as a respiratory chamber in all molluscs. In bivalves it is usually part of the feeding structure. In some mollusks the mantle cavity is a brood chamber, and in cephalopods and some bivalves such as scallops, it is a locomotory organ. The mantle is highly muscular. In cephalopods the contraction of the mantle is used to force water through a tubular siphon, and this propels the animal rapidly through the water. In other molluscs, it is used as a kind of "foot" for locomotion. ...
Rain long foretold takes a long time to pass; if it arrives on short notice, it soon will pass. For the folks I go out collecting with all hikes, digs and kayak trips are rain or shine. Safety is always top of mind and prepping for the weather is paramount. Keep yourself safe whatever part of the world you choose to explore. For forecasts of marine weather in Vancouver call 604.666.3655 or visit http://www.weatheroffice.com/ ...
These Cenomanian representatives (Figs 3A-J, 4A-C) are all very involute at small diameters, becoming progressively more evolute as size increases. The umbilicus is ofmoderate depth, with a flattened, undercut wall and narrowly rounded umbilical shoulder. The whorl section is invariably depressed, reniform, with a whorl breadth to height ratio of 1.1 to 1.32, the greatest breadth below mid-flank in the smaller specimens. Most specimens are weathered, and show neither ornament nor constrictions. SAM PCZ022454, (ex D994) is a particularly evolute juvenile, and although rather worn, has broad, distant, linguoid ventral ribs.. SAM-PCZ022449a (ex A599) is a well-preserved internal mould 68 mm in diameter. There are 6-7 strong flexuous constrictions per halfwhorl. SAM-PCZ022458 (exD2491) is the largest specimen with the shell well preserved, and bears 6-7 distinct collar-ribs per whorl. These arise at the umbilical seam, and are prorsiradiate and flexuous, straight to feebly convex on the inner flank, ...
Types.- Holotype is UWBM74501(Figure 39.2) from Member IV, Zumaya, Spain. Paratype UWBM76079 (Figure 40.9) is from Member IV, Bidart, France. Paratype UWBM76096 (Figure 41) is from Member IV, Hendaye, France. Etymology. - Terminus (Latin), the Roman deity who presided over boundaries or landmarks. Discussion. - Anapachydiscus terminus n. sp. differs from A. fresvillensis in the much higher rib density in early and middle growth stages (more than 60 vs. 31-32, increasingto 40). Later stages are very similar in that the massive involute shell of both species has ventral ribbing only, but flank ribs persist in A. terminus at a stage where they are effacing in A. fresvillensis (compare Figure 40.9 and Figure 35.6). The high rib density immediately distinguishes A. terminus from other European Campanian Anapachydiscus, such as A. wittekindi (Schl ter, 1872) (see Blaszkiewicz, 1980, p. 50, Pl. 42, figs. 1, 2, Pl. 43, fig. 2, Pls. 44-47, Pl. 48, figs. 3, 4, Pl. 49, figs. 1, 3, Pl. 50, figs. 2, 3, Pls. ...
MetaFilter is a weblog that anyone can contribute a link or a comment to. A typical weblog is one person posting their thoughts on the unique things they find on the web. This website exists to break down the barriers between people, to extend a weblog beyond just one person, and to foster discussion among its members.. ...
In particular niches of the marine environment, such as abyssal trenches, icy waters and hot vents, the base of the food web is composed of bacteria and archaea that have developed strategies to survive and thrive under the most extreme conditions. Some of these organisms are considered
One of the coils in a molluscan shell. Whorls are most noticeable among Gastropoda and Cephalopoda, in which the shell is a hollow cone that grows only at the apertural end and tends to curl about its vertical axis. In most molluscs the coils form a helix in which each whorl is attached to the next, but in some the coiling is loose. ...
SELAIN lezat, cumi-cumi kaya gizi. Ada protein, mineral, dan macam-macam vitamin. Tinta cair yang dimilikinya, berguna untuk memerangi tumor. Cumi-cumi merupakan salah satu hewan laut dari keluarga Loliginidae, kelas Cephalopoda. Dalam bahasa Latin, cumi-cumi dikenal dengan sebutan Loligo spp, sedangkan dalam bahasa Inggris squid. Di Indonesia, cumi-cumi dikenal dengan beberapa istilah, seperti enus, nus, sotong,…
Members of the class Cephalopoda are gonochoric. Male and female adults usually die shortly after spawning and brooding, respectively. Mating behavior: Males perform various displays to attract potential females for copulation. During copulation, male grasp the female and inserts the hectocotylus into the females mantle cavity where fertilization usually occurs. Life cycle: Embryos hatch into planktonic stage and live for some time before they grow larger and take up a benthic existence as adults (Ref. 833). ...
Members of the class Cephalopoda are gonochoric. Male and female adults usually die shortly after spawning and brooding, respectively. Mating behavior: Males perform various displays to attract potential females for copulation. During copulation, male grasp the female and inserts the hectocotylus into the females mantle cavity where fertilization usually occurs. Life cycle: Embryos hatch into planktonic stage and live for some time before they grow larger and take up a benthic existence as adults (Ref. 833). ...
First thing--it is not a poem, it is a song; if you expect the meter to be precise, you will be disappointed. I assure you, though, that it is quite singable (and would work with either a guitar or a banjo accompaniment, or perhaps a jug band). I had listened to Roy Zimmermans Christmas album "Peacenick" earlier today (dont wait--click the link, go listen to the samples and buy some of his music!), so there may be a bit of that influence there... but the song that really came to mind as a model was Alex Bevans "Have another laugh on Cleveland blues" (from the days when Dennis Kucinich was known as the young Mayor of Cleveland). So this is not a terribly traditional Squidmas song, but more of a rollicking fun bit of honkytonk. Oh... and in case you didnt know, a "radula" is the rasp-like tongue-equivalent that most mollusks use to kinda sorta grind their food to pieces. Just... dont tell Freud. Anyway, although it is tongue-like, you could not (or rather, a cephalopod could not--I rather ...
The North Pacific Giant Octopus (Enteroctopus dofleini) is a large cephalopod belonging to the genus Enteroctopus. It can be found in the coastal North Pacific, usually at a depth of around 65 meters (215 ft). It can, however, live in much shallower or much deeper waters. It is arguably the largest octopus species, based on a scientific record of a 71 kg (156.5 lb) individual weighed live. The alternative contender is the Seven-arm Octopus based on a 61 kg (134 lb) carcass estimated to have a live mass of 75 kg (165 lb). However, there are a number of questionable size records that would suggest E. dofleini is the largest of all octopus species by a considerable margin. ...
The precursors to modern octopuses had fins that ran alongside their bodies but these fossils do not. "These are sensational fossils, extraordinarily well preserved says Dirk Fuchs of the Freie University Berlin, lead author of the report. But what surprised the scientists most was how similar the specimens are to modern octopus: "these things are 95 million years old, yet one of the fossils is almost indistinguishable from living species." All of this raises an obvious question: if octopuses were so sophisticated 95 million years ago, why arent they running things right now?! Clearly god did not favor the octopus. As this is "cephalopod" and "science" related, it stands to reason that PZ Meyers beat us to it, which he did. Get your fix for buccal masses and gladial vestiges over there.. ...
Other Minds - The Octopus, the Sea, and the Deep Origins of Consciousness audiobook on demand - Although mammals and birds are widely regarded as the smartest creatures on earth, it has lately become clear that a very distant branch of the tree of life has also sprouted higher intelligence: the cephalopods, consisting of the squid, the...
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They are cool. They have many features not found anywhere else, like the crown of suckers lining their arms, going from beak to mouth. The espophagus goes through their brain, and their mantle contains their visera, they have 3 hearts. Cephalopods have remarkable behavior, like changing the color and texture of their skin to match their background.. They have a lot of remarkable behavior, governed by large nervous systems. They have the largest invertebrate nervous systems. Here we can see the brain of an adult mouse, and shown at the same scale, heres an adult octopus, a small to medium size octopus. Here we can see the brain, and on either side there are large optic lobes connecting to the eyes which would be on either side of it. This is less than half of the octopus nervous system, and the rest run down each of their 8 arms. These nervous systems are put together rather differently, but it gives us an excellent example of convergent evolution for how genomes are put together.. From decades ...
Cephalopods muscular stomach is located roughly in the midpoint of the visceral mass. After digestion in the stomach, the bolus moves to a long, white organ, caecum for digestion. Lastly the food goes to the liver, for nutrient absorption and solid waste is excreted through the rectum. Octopuses are said to have external digestion. They will use their beak to break through the crabs armour and excrete a digestion liquid onto the crabs internal organs. The liquid contains a nerve poison that paralyses the prey and proteases, enzymes, that digest its organs, so the crabs interior can be sucked by the octopus ...
The Lias (or Lower Jurassic) marine sediments seen in the cliffs and scars of the Yorkshire coast form the thickest exposed sequence of this age in England at 450m. These rocks are richly fossiliferous and have been studied since the early 19th century. The sedimentary sequence is important for providing a window into the stratigraphy of the North Sea basins to the east and north and also because it contains the Global Boundary Stratotype Section and Point (GSSP) for the base of the Pliensbachian stage. This field guide covers all major marine fossil groups from chronostratigraphically important ammonites to vertebrates, and terrestrial animals and plants washed into the Early Jurassic sea, reviews the early work and workers, and looks at the conservation of these important exposures.. ...
Learn more about minerals in this beautiful and colorful Minerals Rock exhibit that displays over 60 different types of minerals, rocks and ammonites.
Explore similar Bible verses on Nehemiah 2:10 in English Standard Version - But when Sanballat the Horonite and Tobiah the Ammonite servant ...
The discovery and exploitation of a new outcrop of the A1 Unit of yellow marls and marly limestones of Leenhardt (1883), comprised between the Urgonian limestones and the Aptian marls of the authors, leads to question the generalized attribution of this formation to the Deshayesites grandis ammonite Subzone. Data from this section at Croagnes rather lead to place A1, at least locally in the stratotypic area of the surroundings of Apt, at the level of the onset of the anoxic event OAE1a, just below the Roloboceras hambrovi Subzone. The assumed isochroneity of this Unit is also questioned.
Im the cephalopod loving redhead behind Ginga Squid studio. In previous lives Ive been an engineer, accountant, scuba instructor and most recently - a mum to 2 gorgeous little kiddies (well they are most of the time)! I love creating things - it keeps me sane. I particularly love sourcing interesting, unusual and rare natural gemstones and fossils (its my equivalent of a shoe addiction). I also love colour - bring it on! I like to use beads in my work that I can buy Fair Trade from developing countries, so helping the craftspeople directly. My website is http://www.GingaSquid. ...
A single protein found on the surface of squid egg capsules will instantly transform a placid cephalopod into a eight-armed undersea terror, scientists discover.
The little-known but well-recorded vampire squid is in fact the sole, relic descendant of a special cephalopod group. They live in the science-fiction-sounding OMZ.
Occur on the shelf on rocky and rubble bottoms, as well as on sand around rocks. The young are close to shore while the adults occur offshore in the vicinity of the continental slope. Feed mainly on crustaceans, fish and cephalopods (Ref. 4781). Minimum depth reported taken from Ref. 27000. ...
et sp.), a new octopus from the tropical Indo-West Pacific (Cephalopoda: Octopodidae)". Molluscan Research. 25 (2): 57-70.. ... Around 300 species are recognised and the order is grouped within the class Cephalopoda with squids, cuttlefish and nautiloids ... Cited in Borrelli, Luciana; Gherardi, Francesca; Fiorito, Graziano (2006). A catalogue of body patterning in Cephalopoda. ... "The Cephalopoda". University of California Museum of Paleontology. Retrieved 27 March 2017.. ...
Systematics of the Onychoteuthidae Gray, 1847 (Cephalopoda: Oegopsida). Zootaxa 2696: 1-186. Preview ...
On Mesonychoteuthis, a new genus of oegopsid, Cephalopoda. Annals and Magazine of Natural History, Series 9, 16: 272-277. ... Clarke, M.R. (1980). "Cephalopoda in the diet of sperm whales of the southern hemisphere and their bearing on sperm whale ... Mesonychoteuthis hamiltoni Robson, 1925 (Cephalopoda, Oegopsida). Antarktika Doklady Komission 14: 159-189. [English ...
The firefly squid belongs to the Cephalopoda class and the superorder Decapodiformes, commonly known as squids. Their body is ...
Bolstad, K.S.; O'Shea, S. (2004). "Gut contents of a giant squid Architeuthis dux (Cephalopoda: Oegopsida) from New Zealand ...
Wikisource has the text of the 1911 Encyclopædia Britannica article Cephalopoda.. *Cephalopoda Tree of Life Web Project - ... A cephalopod (pronounced /ˈsɛfələˌpɒd/ or /ˈkɛf/~) is any member of the molluscan class Cephalopoda (Greek plural κεφαλόποδα, ... Class Cephalopoda († indicates extinct groups). *Subclass Nautiloidea: Fundamental ectocochleate cephalopods that provided the ... Nixon, M. (1995). "A nomenclature for the radula of the Cephalopoda (Mollusca) - living and fossil". Journal of Zoology. 236: ...
The diet of the longfin inshore squid changes with size; small immature individuals feed on planktonic organisms while larger individuals feed on crustaceans and small fish. Studies showed that juveniles fed on euphausiids and arrow worms, while older individuals fed mostly on small crabs, but also on polychaetes and shrimp. Adults fed on fish (clupeids, myctophids) and squid larvae/juveniles, and those larger than 16 cm fed on fish and squid. Fish species preyed on by longfin inshore squid include silver hake, mackerel, herring, menhaden, sand lance, bay anchovy, weakfish, and silversides. Maurer and Bowman (1985) discovered a difference in inshore/offshore diet: in offshore waters in the spring, the diet is composed of crustaceans (mainly euphausiids) and fish; in inshore waters in the fall, the diet is composed almost exclusively of fish; and in offshore waters in the fall, the diet is composed of fish and squid. Cannibalism is observed in individuals larger than 5 cm."[2] ...
Cephalopoda. Fauna und Flora des Golfes von Neapel. Monograph, no. 35. [English translation: A. Mercado 1972. Israel Program ...
Current Classification of Recent Cephalopoda Archived December 10, 2006, at the Wayback Machine. Naef, A. 1921-23. Cephalopoda ...
Cephalopoda. Report on the Danish Oceanographical Expeditions 1908-10 to the Mediterranean and Adjacent Seas 2(9): 1-94. " ...
1. Cephalopoda (PDF). George W. Tryon. p. 162. Addison Emery Verrill (1878-1882). "The cephalopods of the north-eastern coast ... William Evans Hoyle (1886). "Report on the cephalopoda collected by H.M.S. Challenger during the years 1873-76". In John Murray ... Myopsida, Octopoda" [The Cephalopoda. Part I: Oegopsida. Part II: Myopsida, Octopoda]. Wissenschaftliche Ergebnisse der ... M.J. Imber (1978). "The squid families Cranchiidae and Gonatidae (Cephalopoda: Teuthoidea) in the New Zealand region". New ...
Class Cephalopoda Subclass Nautiloidea: nautilus Subclass †Ammonoidea: ammonites Subclass Coleoidea Division †Belemnoidea: ... Bather, F.A. (1888). "Shell-growth in Cephalopoda (Siphonopoda)". Annals and Magazine of Natural History. 6 (1): 298-310. ... Nishiguchi, Michelle & Mapes, Royal K. (2008). "Cephalopoda". In Ponder, Winston F., & Lindberg, David R. Phylogeny and ...
Meyer,, W. T. (1909). "Chapter 19". Cephalopoda. Die Fauna Südwest-Australiens. ITIS. 2. pp. 329-335. Retrieved 16 May 2016. ... Current Classification of Recent Cephalopoda "CephBase: Sepia irvingi". Archived from the original on 2005. ...
Volume 1. Cephalopoda. 1879. (in the introductory statement) Hyatt A. & Pilsbry H. A. 1911. Manual of conchology, structural ... 1879 - Volume 1. Cephalopoda. 1880 - Volume 2. Muricinae, Purpurinae. 289 pp., 70 plates. 1880-1881 - Volume 3. Tritoniidae, ...
Sepkoski -CEPHALOPODA. ...
Young, R.E., M. Vecchione & K.M. Mangold (1999). Cephalopoda Glossary. Tree of Life Web Project. Young, R.E., M. Vecchione & K. ... Jackson, G.D. (1995). The use of beaks as tools for biomass estimation in the deepwater squid Moroteuthis ingens (Cephalopoda: ... doi:10.1017/S0025315400057684 Clarke, M.R. & L. Maddock (1988). Beaks of living coleoid Cephalopoda. In: M.R. Clarke & E.R. ... doi:10.1111/j.1502-3931.1983.tb02000.x Kanie, Y. (1998). New vampyromorph (Coleoidea: Cephalopoda) jaw apparatuses from the ...
Mollusca: Cephalopoda". NOAA Technical Report NMFS 73 (National Oceanic and Atmospheric Administration & National Marine ...
Class Cephalopoda. In: Cook S de C ed. New Zealand Coastal Marine Invertebrates, volume 1. Christchurch, Canterbury University ... The marine fauna of New Zealand: Octopoda (Mollusca: Cephalopoda). NIWA Biodiversity Memoir 112, 280 pp. O'Shea S, Jackson GD ...
Young, R.E., M. Vecchione & K.M. Mangold (1999). Cephalopoda Glossary. Tree of Life Web Project. Vecchione, M. & R.E. Young ( ... doi:10.2989/025776198784126340 Young, R.E., M. Vecchione & K.M. Mangold (2000). Cephalopoda Fin Cartilage. Tree of Life Web ... 1998). The Magnapinnidae, a newly discovered family of oceanic squid (Cephalopoda: Oegopsida). South African Journal of Marine ...
... , sail, and cuttlefish Chun, Carl (1975). The Cephalopoda. Israel Program for Scientific Translations. p. 120. ...
Cephalopoda: Idiosepiidae). Venus, the Japanese Journal of Malacology 50(3): 165-174. Okutani, T. 1995. Cuttlefish and squids ... Current Classification of Recent Cephalopoda "CephBase: Idiosepius thailandicus". Archived from the original on 2005. ...
Young, R.E., M. Vecchione & K.M. Mangold (1999). Cephalopoda Glossary. Tree of Life Web Project. Prasad, R.R. (1948). " ...
Cephalopoda Glossary. Tree of Life web project. Norman, M. 2000. Cephalopods: A World Guide. ConchBooks, Hackenheim. p. 15. " ... Cephalopoda)". Zoomorphology. 110 (6): 313-316. doi:10.1007/BF01668021. Gleadall I.G. (1989). "An octopus with only seven arms ...
Cephalopoda Glossary. Tree of Life Web Project. Young, R.E., M. Vecchione & K.M. Mangold (1997). Cephalopod Funnel Locking- ...
Accessed on 21 November 2016 Young, R.E., M. Vecchione & K.M. Mangold (1999). Cephalopoda Glossary. Tree of Life Web Project. ...
Cephalopoda) in the Great Barrier Reef and Coral Sea, Reviews in Fish Biology and Fisheries" on DeepDyve, the largest online ... Genetic diversity of isolated populations of Nautilus pompilius (Mollusca, Cephalopoda) in the Great Barrier Reef and Coral Sea ... A phylogenetic study of the squid family Onychoteuthidae (Cephalopoda: Oegopsida). Bonnaud, L; Rodhouse, PG; Boucher-Rodoni, R ... Genetic diversity of isolated populations of Nautilus pompilius (Mollusca, Cephalopoda) in the Great Barrier Reef and Coral Sea ...
Encyclopedia of Life, Cephalopoda *Major cephalopod references on the web:. *Hoyle, W. E. 1886. Report on the Cephalopoda ... For an overview of the people working on the ToL Cephalopoda branch, see ToL Scientific Contributors for Cephalopoda ... Class: Cephalopoda Cuvier, 1797 *Subclass: Nautiloidea Agassiz, 1847 * * * * * *Fam: Nautilidae Blainville, 1825 ... The Cephalopoda is an ancient and very successful group of the Mollusca. Cephalopods have been among the dominant large ...
... Richard E. Young, Michael Vecchione, and Katharina M. Mangold (1922-2003) A B C D E F G H I J K L M N O P ... The Cephalopoda is a class within the Mollusca. Molluscan foot - A major structure in molluscan morphology. In gastropods the ... Page: Tree of Life Cephalopoda Glossary Authored by Richard E. Young, Michael Vecchione, and Katharina M. Mangold (1922-2003). ... For example a synonym of the Cephalopoda is the Siphonopoda.. Systematics - The classification of organisms into hierarchial ...
Boletzky SV (1974) The larvae of cephalopoda: a review. Thalassia Jugosl 10(1/2):45-76Google Scholar ...
MOLLUSCA (V): DIVERSITY-Cephalopoda (Mollusca study images; click on tree to see full cladogram) ... 8) Class CEPHALOPODA (nautilus, squids, octopus) ~700 marine spp a) includes largest (to 19 m), fastest swimming (to 25 kph), ...
A new species of dicyemid mesozoan is described from Sepiella japonica Sasaki, 1929, collected from the eastern area of Inland Sea, Osaka Bay, and Kii Strait in Japan. Dicyema sepiellae n. sp. is a large species that reaches about 4,000 microm in len
Cephalopoda in the three subclasses as shown. Nautiloids are also known as Palcephalopoda. , a term which is applied to most ... The name Cephalopoda literally means head feet which refers to the cluster of [[arm]]s and/or [[tentacle]]s that project ... The name Cephalopoda literally means head feet which refers to the cluster of [[arm]]s and/or [[tentacle]]s that project ... Class Cephalopoda===. +. The ,u,. Palcephalopoda. -Neocephalopoda,/u, distinction is based on essential differences between the ...
The name Cephalopoda literally means head feet and refers to the fact that these animals have a [[. foot. ]] (actually a ... Cephalopoda in the three subclasses as shown. Nautiloids are also known as Palcephalopoda. , a term which is applied to most ... The name Cephalopoda literally means head feet which refers to the cluster of [[. arm. ]]. s and/or [[tentacle]]s that ... Class Cephalopoda===. +. ,u,Dibranchiata,/u,-- forms with two gills, considered advanced. Equivalent to the Coleoidea, possibly ...
The palcephalopoda includes most of the Nautiloidea as originally defined but leaves out the Orthocerida which are combined with the Bactritida, Ammonoidea, and coleoids in the Neocephalopoda. Palcephalopods characteristically have cap-shaped apeces with a cicatrix ore something similar and are retrosiphonte, meaning the septal necks in the siphuncle point to the rear. The apex in neocephalopoda is bulbous and lacks a cicatrix. The only living palcephalopods are Nautilus and Allonautilus. Both are tetrabranchiate (posses 4 gills), have radula with 9 teeth and 4 marginalia (Lateradulata) and posses a large number of sticky finger-like arms that lack suckers. Reproduction is what is known as K-selected, with a few large yolk-rich eggs produced a number of times from which large well developed offspring come. Adults are long-lived ...
The following basically follows Teichert (1988) except that Teicherts two Subclasses Endoceratoidea and Actinoceratoidea have been discarded, since the two orders [[Endocerida]] and [[Actinocerida]] are not so distinct from their contemporaries as to justify such a high taxonomic ranking ...
Cephalopoda +. Cephalopods (Class Cephalopoda)are exclusively marine mollusks (Phyllum [[. Mollusca. ]]) with well ... class Cephalopoda has been traditionally divided into three subclasses on the basis of shell structure. , or two subclasses on ... The name Cephalopoda literally means head feet which refers to the cluster of [[arm]]s and/or [[tentacle]]s that project ... Cephalopoda literally means head feet and refers to the fact that these animals have a foot (actually a cluster of tentacles ...
The apex in neocephalopoda is bulbous and lacks a cicatrix. The only living palcephalopods are Nautilus and Allonautilus. Both are tetrabranchiate ...
Plectronoceras in an excellent place to start, even for the whole shabang, being the oldest known cephalopod, known from as early as the Franconian, lower Yenchou, of China. I added the Ellesmerocerida which are the root stock of all post Cambrian cephalopods. The Endocerida and Actinocerida are shown slightly differently to allow for the added Orthocerida. All three are independently derived from the Ellesmerocerida. The Orthocerida provides a place for the Bactrida to attach. Stemming from the Bactida are three independent groups, the Ammonidea, Aulacocerida (Belemnoidea) , and Coleoidea. The line of direct decent from the Ellesmerocerida continues to the Nautilida, which along with the Coleoidea contains the most recent cephalopods ...
Cephalopoda: Sepiidae). by The Biological Bulletin; Biological sciences Research Cephalopods Morphology (Biology) Nautilus ... APA style: Cuttlebone Morphology Limits Habitat Depth in Eleven Species of Sepia (Cephalopoda: Sepiidae).. (n.d.) >The Free ... A review of the Sepiidae (Cephalopoda) of Southern Africa. Ann. S. Afr. Mus. 59 (10): 313 pp. Timoshenko, D. 1940. Theory of ... MLA style: "Cuttlebone Morphology Limits Habitat Depth in Eleven Species of Sepia (Cephalopoda: Sepiidae).." The Free Library. ...
Silas EG (1968) Cephalopoda of the west coast of India collected during the cruises of the research vessel Varuna, with a ... Voss NA (1969) A monograph of the Cephalopoda of the North Atlantic: the family Histioteuthidae. Bull Mar Sci 19:713-867Google ... Berry SS (1918) Report on the Cephalopoda Obtained by the FIS. "Endeavour" in the Great Australian Bight and Other Southern ... Presence of the Wondrous Jewel Squid Histioteuthis miranda (Cephalopoda: Histioteuthidae) in the Eastern Arabian Sea and ...
Cephalopoda (9788400072674): NHBS - Ángel Guerra Sierra, Museo Nacional de Ciencias Naturales ...
Cephalopoda. Introduction. Few studies have investigated the complex digestive tract of Nautilus pompilius and Nautilus ... Boucher-Rodoni, R. (1973). Vitesse de digestion dOctopus cyanea (Cephalopoda: Octopoda). Mar. Biol. 18,237 -242. ... Schipp, R. and Martin, A. W. (1981). Cytology of the renal appendages of Nautilus (Cephalopoda, Tetrabranchiata). Cell Tissue ... Boucher-Rodoni, R. and Mangold, K. (1977). Experimental study of digestion in Octopus vulgaris (Cephalopoda, Octopoda). J. Zool ...
Voight, J. R. , Pörtner, H. O. and ODor, R. K. (1994): A review of ammonia-mediated buoyancy in squids (Cephalopoda) , Marine ...
The digestive tract of Nautilus pompilius (Cephalopoda, Tetrabranchiata): an X-ray analytical and computational tomography ...
Pulpos octopódidos (Cephalopoda: Octopodidae). 69-98. In: Boschi, E. E. (Ed.). El mar argentino y sus recursos pesqueros. Tomo ... The digestive system of E. megalocyathus presents the typical morphology in U shape of the Cephalopoda Coleoidea. The dorsal ... MICROANATOMÍA DEL SISTEMA DIGESTIVO DE ENTEROCTOPUS MEGALOCYATHUS (CEPHALOPODA, OCTOPODA) EN EL ATLÁNTICO SUROCCIDENTAL ... Morfología del aparato digestivo de Enteroctopus megalocyathus y Loligo sanpaulensis (Mollusca, Cephalopoda). Iheringia, Sér. ...
Part 4, Jurassic Cephalopoda and a Cretaceous Nautilus. Bulletin of the AMNH ; v. 82, article 3. en_US. ... Part 4, Jurassic Cephalopoda and a Cretaceous Nautilus. Bulletin of the AMNH ; v. 82, article 3. ...
Cephalopoda). Production of soma and gonad in maturing female Illex argentinus (Mollusca: Cephalopoda). Samples of male Illex ...
Cephalopoda. Cephalopods include the squid, octopus, cuttlefish, and the survivor of an ancient lineage-the nautilus. Their ... the Cephalopoda (squid, octopuses, cuttlefish, and nautilus), the Polyplacophora (chitons), the Scaphopoda (tooth shells), the ...
Cephalopoda Glossary The gladius, found in many decapodiforms and Vampyroteuthis, is an internal remnant of the originally ...
Squids (Cephalopoda). Introduction. Squids belong to the group of mollusks called cephalopods, which include octopi, cuttlefish ...
  • 1998) Classification, type localities and type repositories of recent Cephalopoda, Systematics and Biogeography of Cephalopods. (wikipedia.org)
  • However, because chambered shells are found in a range of molluscs - monoplacophorans and gastropods as well as cephalopods - a siphuncle is essential to ally a fossil shell conclusively to the cephalopoda. (wikipedia.org)
  • Although earlier molluscan fossils are also septate, Knightoconus is the latest septate mollusc before the first sipunculate cephalopods - a point that has been taken to prove its relevance to the Cephalopoda. (wikipedia.org)
  • Systematics of Alloteuthis (Cephalopoda:Loliginidae) based on molecular and morphometric data. (geomar.de)
  • 1964. The Nautiloid Order Ellesmeroceratida (Cephalopoda). (wikipedia.org)
  • Cephalopoda, Fossil -- Ethiopia -- Harerge Kifle Hager. (amnh.org)
  • Cephalopoda, Fossil -- Somalia. (amnh.org)
  • Age of fossil Argonautidae (Cephalopoda) from Hokuriku Province (central Honshu, Japan) based on diatom biostratigraphy" (PDF). (wikipedia.org)
  • The Evolution of the Cephalopoda. (wikipedia.org)
  • Discosorids and Oncocertids (Cephalopoda) of the Middle Ordovician Kunda and Aseri Regional Stages of Baltoscandia and the early evolution of these groups. (wikipedia.org)
  • Roper, C. F. E. and M. J. Sweeney (1978) , A catalog of the type-specimens of Recent Cephalopoda in the National Museum of Natural History. (wikipedia.org)