ExtinctSegmented bodies and jointedCrustaceansAppendagesArthropodaSpeciesInvertebratesExoskeletonRepresented in the fossil recordCuticleSilurianPreyCambrianSpidersEvolutionaryLimbsScorpionsOcelliPairsEnvironmentsSegmentsInsectsGroupAnimalsFoundExtantFormationDistinctNervousOceansScientistsAnimalClassGroupsBelongDiversitySitesMillionFemaleRelationshipsRangeSuccessfulPresentFormRareHeadLife
Extinct2
- Eurypterids, often informally called sea scorpions, are a group of extinct arthropods that form the order Eurypterida. (wikipedia.org)
- Fossil evidence suggests that its diet might have consisted of trilobites, a group of extinct marine arthropods that lived in the Cambrian Period. (a-z-animals.com)
Segmented bodies and jointed2
- Like all other arthropods, eurypterids possessed segmented bodies and jointed appendages (limbs) covered in a cuticle composed of proteins and chitin. (wikipedia.org)
- Arthropods are invertebrates with segmented bodies and jointed limbs. (alchetron.com)
Crustaceans2
- Arthropods form the phylum Arthropoda , which includes the insects , arachnids , myriapods, and crustaceans . (alchetron.com)
- Insects may be found in nearly all environments, although only a small number of species reside in the oceans, which are dominated by another arthropod group, crustaceans. (meditative-philately.com)
Appendages4
- An arthropod (from Greek arthro- , joint + podos , foot) is an invertebrate animal having an exoskeleton (external skeleton), a segmented body, and jointed appendages (paired appendages ). (alchetron.com)
- The arthropod body plan consists of segments, each with a pair of appendages. (alchetron.com)
- All have bristly parapodia (movable, paired appendages) on each body segment. (encyclopedia.com)
- This scorpion, and all other scorpion species, are arthropods (invertebrate animals with jointed appendages) in the class Arachnida, a class first described in 1812 by the French naturalist and zoologist Jean Léopold Nicolas Frédéric Cuvier (1769 - 1832) using the Greek noun ἀράχνη , a-'rach-ne = "spider. (bugsinthenews.info)
Arthropoda1
- Insects ( Latin insecta ), also called insects or kerfe , are the species-richest class of arthropods (Arthropoda) and at the same time, with an absolute majority, the most species-rich class of animals at all. (zxc.wiki)
Species9
- Following their appearance during the Ordovician, eurypterids became major components of marine faunas during the Silurian, from which the majority of eurypterid species have been described. (wikipedia.org)
- The opisthosoma comprised 12 segments and the telson, the posteriormost division of the body, which in most species took the form of a blade-like shape. (wikipedia.org)
- Paleontologists found fossils of the type species of this genus, Anomalocaris Canadensis in the Burgess shale formation of Canada. (a-z-animals.com)
- Their vision relies on various combinations of compound eyes and pigment-pit ocelli: in most species the ocelli can only detect the direction from which light is coming, and the compound eyes are the main source of information, but the main eyes of spiders are ocelli that can form images and, in a few cases, can swivel to track prey. (alchetron.com)
- Estimates of the number of arthropod species vary between 1,170,000 and 5 to 10 million and account for over 80% of all known living animal species. (alchetron.com)
- The group first appeared in the Cambrian (polychaetes are the only annelids to have a fossil record) and it contains more than 5000 species. (encyclopedia.com)
- [3] There are approximately 12,000 named species classified into 16 orders and around 140 families , making Diplopoda the largest class of myriapods , an arthropod group which also includes centipedes and other multi-legged creatures. (wikipedia.org)
- Malacology is the branch of invertebrate zoology which deals with the study of the Mollusca , the second-largest phylum of animals in terms of described species after the arthropods. (absoluteastronomy.com)
- Such efficient economy of body moisture enables some species to acquire sufficient water from the food they consume. (bugsinthenews.info)
Invertebrates2
- Glaphurochiton concinnus was one of the first animal described by Dr. Eugene Richardson, Jr. He described it as Helminthochiton concinnus in the paper 'Pennsylvanian invertebrates of the Mazon Creek area, Illinois: marine fauna', which appeared in the Field Museum's journal Fieldiana in 1956. (esconi.org)
- Insects or Insecta (from Latin insectum) are hexapod invertebrates and the largest group within the arthropod phylum. (meditative-philately.com)
Exoskeleton3
- Insects have a chitinous exoskeleton, a three-part body (head, thorax and abdomen), three pairs of jointed legs, compound eyes and one pair of antennae. (meditative-philately.com)
- Its primary defence mechanism is to curl into a tight coil, thereby protecting its legs and other vital delicate areas on the body behind a hard exoskeleton. (wikipedia.org)
- The exoskeleton forms the outer layer of the insect's body. (zxc.wiki)
Represented in the fossil record2
- However, polychaetes are represented in the fossil record largely by burrows (e.g. (encyclopedia.com)
- Scorpions are well represented in the fossil record, dating from the Silurian period about 430 million years distant. (bugsinthenews.info)
Cuticle2
- Arthropods are characterized by their jointed limbs and cuticle made of chitin , often mineralised with calcium carbonate . (alchetron.com)
- The rigid cuticle inhibits growth, so arthropods replace it periodically by moulting . (alchetron.com)
Silurian1
- Silurian scorpion fossils are of marine animals with gills. (bugsinthenews.info)
Prey1
- Experts believed it could stalk its prey with its large compound eyes, swim quickly to catch up with it, and grab the prey with its strong, spiked front limbs. (a-z-animals.com)
Cambrian1
- The evolutionary ancestry of arthropods dates back to the Cambrian period. (alchetron.com)
Spiders2
- To further test this hypothesis, we investigated neurogenesis in Pycnogonida, or sea spiders, a group of marine arthropods with close affinities to euchelicerates. (biomedcentral.com)
- Like many spiders (e.g., recluse spiders in the Sicariidae family) scorpions exhibit some of the lowest arthropod metabolic rates on record and - like such spiders - are often able to survive without food for a year or more. (bugsinthenews.info)
Evolutionary3
- The remarkable similarity between the camera eyes of cephalopods and vertebrates is one of the best-known examples of evolutionary convergence. (mapoflife.org)
- In fact, the nervous system has been considered 'a particularly suitable organ in which to search for characters to reconstruct evolutionary relationships between the major arthropod groups' [ 2 ]. (biomedcentral.com)
- Accumulating fossil evidence has demonstrated that lampreys in the Devonian period were already almost identical to the modern adult lampreys, with well-developed oral disc, annular cartilages, and circumoral teeth3,4,5,6, suggesting the evolutionary long-term stability of lampreys. (firstpointsoftware.com)
Limbs1
- Arthropod hatchlings vary from miniature adults to grubs and caterpillars that lack jointed limbs and eventually undergo a total metamorphosis to produce the adult form. (alchetron.com)
Scorpions3
- Almost all arthropods lay eggs, but scorpions give birth to live young after the eggs have hatched inside the mother. (alchetron.com)
- Except for the changes in locomotion and respiration necessitated by the migration to land, the basic body plan is externally similar to that of scorpions that lived 425 million years ago… The earliest scorpions possessed a segmented opisthosoma with the mesosoma and metasoma clearly differentiated, well-formed chelate pedipalps and chelicerae, eight walking legs, pectines (unique to scorpions), and a terminal telson. (bugsinthenews.info)
- Scorpions adapted to arid climes are believed capable of managing body hydration more efficiently than any other arthropod known: their excreta, of essentially insoluble nitrogenous wastes, do not export body moisture. (bugsinthenews.info)
Ocelli1
- The prosoma was covered by a carapace (sometimes called the "prosomal shield") on which both compound eyes and the ocelli (simple eye-like sensory organs) were located. (wikipedia.org)
Pairs1
- Octopuses have two eyes and four pairs of arms, and like other cephalopods they are bilaterally symmetric. (absoluteastronomy.com)
Environments1
- Lampreys are blood-sucking vampires in marine environments. (firstpointsoftware.com)
Segments4
- The body of the Anomalocaris had 14 podomeres or segments. (a-z-animals.com)
- Like their exteriors, the internal organs of arthropods are generally built of repeated segments. (alchetron.com)
- Most millipedes have very elongated cylindrical or flattened bodies with more than 20 segments, while pill millipedes are shorter and can roll into a tight ball. (wikipedia.org)
- Between the individual segments there are elastic membranes, the intersegmental membranes , which enable the segments to move relative to one another and to change the volume of the body during egg production, eating or breathing. (zxc.wiki)
Insects2
- The smallest free-living insects are dwarf beetles with a body length of 0.4 mm (even smaller figures are based on measurement errors). (zxc.wiki)
- The largest known insects are stick insects with a body length of about 33 centimeters and the giant longhorn beetle Titanus giganteus with a body length of 15 centimeters. (zxc.wiki)
Group2
- A majority of fossils are from fossil sites in North America and Europe because the group lived primarily in the waters around and within the ancient supercontinent of Euramerica. (wikipedia.org)
- The group is generally regarded as monophyletic, and many analyses support the placement of arthropods with cycloneuralians (or their constituent clades) in a superphylum Ecdysozoa. (alchetron.com)
Animals1
- Cuttlefish are marine animals of the order Sepiida. (absoluteastronomy.com)
Found3
- Only a handful of eurypterid groups spread beyond the confines of Euramerica and a few genera, such as Adelophthalmus and Pterygotus, achieved a cosmopolitan distribution with fossils being found worldwide. (wikipedia.org)
- Present-day fossil discoveries indicate that it had widespread distributions with fossils found in various places, including Canada, Australia, Greenland, Utah, and China . (a-z-animals.com)
- Generally, isolated valves or a rare soft part of the animal are found as fossils. (esconi.org)
Extant1
- Nautilus is the common name of marine creatures of cephalopod family Nautilidae, the sole extant family of the superfamily Nautilaceae and of its smaller but near equal suborder, Nautilina. (absoluteastronomy.com)
Formation1
- The formation contained relatively great numbers of Anomalocaris fossils, which suggests that they were present in abundance in this area. (a-z-animals.com)
Distinct1
- The developmental processes of early neurogenesis show distinct features in the major arthropod groups. (biomedcentral.com)
Nervous3
- combines features of central nervous system development that have been hitherto described separately in different arthropod taxa. (biomedcentral.com)
- Nervous system development and adult neuroanatomy of arthropods provide 'a wealth of valuable characters that can be used for phylogenetic inferences' [ 1 ]. (biomedcentral.com)
- The basic architecture of the arthropod central nervous system is most evident during embryonic development. (biomedcentral.com)
Oceans1
- It swam the oceans using the rows of undulating overlapping lobes (flexible flaps) on the sides of its body. (a-z-animals.com)
Scientists2
- The name Anomalocaris is a reference to the first fossil of the animal that was discovered which scientists thought was similar to the abdomen of a crustacean, hence the name. (a-z-animals.com)
- The discovery of a fossilized mosquito has led some scientists to question the presumed age of ancient fossils and rock layers. (freesmfhosting.com)
Animal1
- The word "insect" (from Latin īnsectum "incised") was Germanized in the 18th century and therefore means "incised (animal)", which refers to the strongly separated body parts. (zxc.wiki)
Class1
- Millipedes can be distinguished from the somewhat similar but only distantly related centipedes (class Chilopoda), which move rapidly, are venomous , carnivorous , and have only a single pair of legs on each body segment. (wikipedia.org)
Groups1
- Likewise, the relationships between various arthropod groups are still actively debated. (alchetron.com)
Belong1
- The respiratory and excretory systems of arthropods vary, depending as much on their environment as on the subphylum to which they belong. (alchetron.com)
Diversity1
- Today these immense bodies of water still hold the greatest diversity of living things on the planet. (epdf.tips)
Sites1
- The degree of similarity between the active sites in arthropod and molluscan haemocyanin has been called "remarkable" and "startling", but actually suggests that wherever in the universe life employs copper for aerobic respiration it will call upon haemocyanin. (mapoflife.org)
Million1
- Butterfly fossils date to the Paleocene, which was about 56 million years ago. (meditative-philately.com)
Female1
- The preservation of fossil female mosquito was an extremely improbable event, the journal article explains. (freesmfhosting.com)
Relationships1
- Studies on early neurogenesis have had considerable impact on the discussion of the phylogenetic relationships of arthropods, having revealed striking similarities and differences between the major lineages. (biomedcentral.com)
Range2
- Arthropods range in size from the microscopic crustacean Stygotantulus up to the Japanese spider crab . (alchetron.com)
- Arthropods also have a wide range of chemical and mechanical sensors, mostly based on modifications of the many setae (bristles) that project through their cuticles . (alchetron.com)
Successful1
- Evidently this early body plan was a particularly successful one, sufficiently general and well adapted that major changes did not subsequently occur. (bugsinthenews.info)
Present2
- Eyes may be present. (encyclopedia.com)
- To acknowledge this, we present two possible scenarios on the evolution of arthropod neurogenesis, whereby Myriapoda play a key role in the resolution of this issue. (biomedcentral.com)
Form2
- Similarly, the scorpion's respiratory organs - in the form of spiracles, book lungs, and respiration through the integument - have a role in preserving body hydration as well. (bugsinthenews.info)
- Parasitic lampreys usually attach themselves to the body surface of the host through their sucker-like oral disc, rasp a hole in the skin with a tongue-like piston tipped with denticles that form the cutting edges, and suck the blood of the host for days. (firstpointsoftware.com)
Rare1
- Remarkably, the fossil appears to contain traces of preserved blood a feature that the discoverers describe as both rare and unique. (freesmfhosting.com)
Head1
- The Anomalocaris has a large head with a pair of large compound eyes on both sides. (a-z-animals.com)
Life1
- Depending on their way of life, the body of the insect can be elongated, flattened or more or less spherical. (zxc.wiki)