jawless


jawless
fishes lacking jaws are vastly outnumbered by jawed fishes. The living Agnatha, hagfishes and lampreys, number about 108 species. This is a paraphyletic group and, as well as lacking jaws in contrast to the jawed fishes, also lacks pectoral and pelvic fins, has one or two semicircular canals, no scales, no bones, no vertebral centra but only a notochord, and pores rather than slits as gill openings

Dictionary of ichthyology. 2009.

Look at other dictionaries:

  • jawless — See jaw. * * * …   Universalium

  • jawless — adjective Lacking a jaw …   Wiktionary

  • jawless — jaw·less jȯ ləs adj having no jaw …   Medical dictionary

  • jawless — adj. lacking a jaw (especially a lower jaw) …   English contemporary dictionary

  • jawless — jaw·less …   English syllables

  • jawless — adjective of animals having no jaw • Ant: ↑jawed …   Useful english dictionary

  • jawless fish — [jô′lis] n. any of a class (Agnatha) of fishes with a cartilaginous skeleton, an eel like body, and a circular, sucking mouth lacking jaws, consisting of the lampreys and hagfishes …   English World dictionary

  • jawless fish — cyclostome. [1965 70; JAW1 + LESS] * * *       any of numerous primitive, fishlike, jawless vertebrates comprising the class Agnatha, which includes the lampreys, hagfishes, and some extinct groups. See hagfish; lamprey. * * * …   Universalium

  • jawless fish — noun eel shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms • Syn: ↑jawless vertebrate, ↑agnathan • Hypernyms: ↑aquatic vertebrate • Hyponyms: ↑ostracoderm, ↑ …   Useful english dictionary

  • jawless vertebrate — noun eel shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms • Syn: ↑jawless fish, ↑agnathan • Hypernyms: ↑aquatic vertebrate • Hyponyms: ↑ostracoderm, ↑heterostrac …   Useful english dictionary


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