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  • gills
  • As members of Agnatha (Greek, "no jaws"), hagfish are characterized by the absence of jaws derived from gill arches (bone or cartilage supporting the gills), although they do have a biting apparatus that is not considered to have been derived from gill arches (Nelson 1994). (newworldencyclopedia.org)
  • Although this new hagfish differs from living forms in position of the gills, feeding apparatus, and relatively well developed eyes, it is quite similar to its recent relatives. (sciencemag.org)
  • These properties are consistent with the gill-clogging hypothesis, which we tested here by quantifying the effects of hagfish slime on water flow through an artificial gill model and real fish gills. (biologists.org)
  • Here, we test the gill-clogging hypothesis by measuring the effect of hagfish slime on water flow through an artificial gill analogue and real gills in isolated fish heads and demonstrate that the slime has dramatic effects on flow at physiological water pressures. (biologists.org)
  • A) Apparatus for measuring the effect of hagfish slime on flow through fish gills, consisting of a severed rockfish head with its mouth propped open and housed in PVC piping. (biologists.org)
  • lamprey
  • Our analysis indicates that the third hagfish VLR is the ortholog of lamprey VLRA , while the previously identified hagfish " VLRA " is the counterpart of lamprey VLRC . (pnas.org)
  • Sequence analysis, structural comparison, and phylogenetic analysis indicate that the unique hagfish VLR is the counterpart of lamprey VLRA and the previously identified hagfish "VLRA" is the lamprey VLRC counterpart. (pnas.org)
  • It fills a 100-million-year gap in the fossil record and shows that hagfish are more closely related to the blood-sucking lamprey than to other fishes. (eurekalert.org)
  • We investigated the Hox repertoire and Hox gene expression profiles in three different species-a hagfish, a lamprey and a shark-encompassing the two major groups of vertebrates, and found that these are expressed following a whole-cluster, temporally staggered pattern, indicating that WTC has been conserved during the past 500 million years despite drastically different genome evolution and morphological outputs between jawless and jawed vertebrates. (essex.ac.uk)
  • Variable lymphocyte receptors (VLRs) are antigen receptors in the jawless vertebrates lamprey and hagfish. (embopress.org)
  • Evolutionary crossroads in developmental biology: cyclostomes (lamprey and hagfish). (blogspot.com)
  • glands
  • Also known as slime eels, hagfish have glands on either side of their bodies that produce enormous quantities of mucoid material, probably as a defense mechanism. (infoplease.com)
  • Glands of the hagfish secrete a concentrated slime that expands rapidly and protects from predators via interacting fibers and water-holding proteins. (asknature.org)
  • The formation of this slime starts in glands lining the hagfish body, along which slime gland openings are visible as pores. (asknature.org)
  • Hagfish slime is composed of two interacting components, slime thread skeins and mucin vesicles, which are both released from glands along the ventrolateral length of the animal. (asknature.org)
  • Our observations show that exudate is locally released from the slime glands as a coherent jet and that hagfish do not appear to use their slime as a protective envelope. (biologists.org)
  • Hagfish have a series of glands along their bodies that produce tiny packets of tightly-coiled keratin fibers, lubricated by mucus-y goo. (eurekalert.org)
  • A single foot-and-a-half, nine-ounce hagfish can fill a bucket with slime in seconds from 100 glands alongside its body. (alaskajournal.com)
  • Synchrotron scanning of the Tethymyxine tapirostrum hagfish fossil revealed traces of chemical left behind when the soft tissues fossilized, including signs of keratin that indicate a series of slime-producing glands along the body. (phys.org)
  • Atlantic
  • Using an in situ preparation on Atlantic hagfish, they found that despite inhibition of cardiac mitochondrial function with cyanide or sodium azide, cardiac output was maintained for at least 3 h. (biologists.org)
  • Agnatha
  • Others, however, place Vertebrata and Craniata as synonyms at the same level of classification, and thereby retain hagfish (Myxini) as members of the superclass Agnatha within the vertebrates (Nelson 1994). (newworldencyclopedia.org)
  • predators
  • Miyashita and his colleagues found more than a hundred concentrations of keratin along the body of the fossil, meaning that the ancient hagfish probably evolved its slime defense when the seas included fearsome predators such as plesiosaurs and ichthyosaurs that we no longer see today. (eurekalert.org)
  • Vertebrata
  • Janvier (1981) and a number of others put hagfish in a separate subphylum Myxini, which along with the subphylum Vertebrata comprises the taxon Craniata, recognizing the common possession of a cranium (Janvier 1981). (newworldencyclopedia.org)
  • fishery
  • Hagfish is the real name for what are commonly called slime eels and could become a viable fishery with ready markets standing by. (alaskajournal.com)
  • Now, two Alaska biologists who were given a special permit to catch 60,000 pounds of hagfish for their studies are testing the waters for a fishery with a longliner in Southeast. (alaskajournal.com)
  • Gill
  • Apparatus for measuring the effects of hagfish slime on flow rate through and resistance across an artificial gill analogue, which consisted of a piece of test tube brush within polyvinyl tubing. (biologists.org)
  • They also resemble teleosts in that transepithelial calcium fluxes across the hagfish gill pouches respond to extracts of Stannius corpuscles. (naver.com)
  • metabolic
  • The purpose of this study was to measure the metabolic response of the excised, cannulated hagfish heart to anoxia using direct calorimetry. (biologists.org)
  • Altogether, these results illustrate that the low metabolic demand of the hagfish heart allows for near-routine levels of cardiac metabolism to be supported anaerobically. (biologists.org)
  • The maintenance of anoxic cardiac function in hagfish is thought to be associated with a relatively low cardiac metabolic requirement ( Forster, 1991 ), such that the hagfish heart's routine power output - the lowest ever measured in a fish - is within the heart's maximum glycolytic potential ( Farrell and Stecyk, 2007 ). (biologists.org)
  • Thus
  • Thus, hagfishes have a long, conservative geological history. (sciencemag.org)
  • Hagfish are thus similar to teleosts to the extent that they can and do maintain a plasma calcium concentration which is quite different from that of the ambient medium. (naver.com)
  • genus
  • A fossil hagfish (Myxinoidea), a new genus from the Pennsylvanian, shows tentacles, structures of the head skeleton and internal organs. (sciencemag.org)
  • fishes
  • We're excited to have Dr. J effrey D razen , a biologist who studies deep-sea fishes join us to share his thoughts on two of our Hagfish Day stars, the hagfish and the barreleye. (whaletimes.org)
  • Hagfish may be ugly but they represent the ancestors of all of today's fishes and other vertebrates! (whaletimes.org)
  • subphylum
  • Hagfish is the common name for the marine craniates (animals with skulls) of the class (or subphylum) Myxini , characterized by a scaleless, eel -like body that lacks both paired fins and vertebrae , but does have a cranium. (newworldencyclopedia.org)
  • fibers
  • We are also doing biomimetic research on how we might be able to produce artificial fibers that are as strong and tough as hagfish slime threads. (whaletimes.org)
  • The numerous protein fibers that are found within hagfish slime are produced individually within the cytoplasm of highly specialized cells know as gland thread cells. (chapman.edu)
  • biology
  • In: J.M. Jørgensen, J.P. Lomholt, R.E. Weber, and H. Malte (eds), The biology of hagfishes , pp. 378-395. (iucnredlist.org)
  • This allows us to put an evolutionary date on unique traits that set hagfish apart from all other animals," said Tetsuto Miyashita, PhD, a Chicago Fellow in the Department of Organismal Biology and Anatomy at UChicago who led the research. (eurekalert.org)
  • A biology specialist at Ernst Mayr, Barr holds a master's degree in natural history-and she speaks effusively about how "hagfish exude slime when they're attacked" or how, if C. elegans babies hatch without sufficient food available, they will wait until the time is right to continue developing. (harvard.edu)
  • produce
  • Hagfish produce a very unique substance. (alaskajournal.com)
  • The U.S. Navy is using synthetic hagfish slime to produce a substance that is lighter and stronger than Kevlar. (alaskajournal.com)
  • Hagfish gland thread cells are unique in that they produce a high aspect ratio fiber from cytoskeletal building blocks within the confines of their cytoplasm. (mdpi.com)
  • In order to deal with all the excess ammonia, hagfish should be able to produce and excrete huge amounts of urea in a relatively short amount of time. (southernfriedscience.com)
  • Publications] Morisawa, S.: 'Hagfish sperm produce an acrosomal process at the acrosome reaction. (nii.ac.jp)
  • Hagfishes are able to produce vast amounts of defensive slime when they are attacked. (chapman.edu)
  • eggs
  • I investigated for the first time the fine structure of formation of the micropylar region in hagfish eggs during late stages of oogenesis, focusing on the bottom region of the micropyle and the egg surface. (nii.ac.jp)