eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms
Hypernyms: ↑aquatic vertebrate
Member Holonyms: ↑Agnatha, ↑superclass Agnatha

Useful english dictionary. 2012.

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  • agnathan — n. 1. an eel shaped vertebrate without jaws or paired appendages; a member of the Agnatha. The group includes the cyclostomes and some extinct forms. Syn: jawless vertebrate, jawless fish [WordNet 1.5] …   The Collaborative International Dictionary of English

  • agnathan — 1. adjective Belonging or pertaining to the superclass Agnatha, the jawless vertebrates. Haikouichthys is one of three species of jawless (or agnathan) fish to be found in the Early Cambrian period. 2. noun A member of the superclass Agnatha of… …   Wiktionary

  • agnathan — /ag neuh theuhn/, n. 1. any member of the vertebrate class Agnatha. adj. 2. agnathous. [AGNATH(A) + AN] * * * ▪ fish Introduction   any member of the group of primitive, jawless fishes (fish) that includes the lampreys (lamprey) (order… …   Universalium

  • Agnatha — (Greek, no jaws ) is a paraphyletic [cite book|last=Purnell|first=M. A.|authorlink=|editor=Derek E. G. Briggs and Peter R. Crowther|year=2001|title=Palaeobiology II|publisher=Blackwell Publishing|location=Oxford|isbn=0 632 05149 3|page=p401; Note …   Wikipedia

  • Heterostraci — Taxobox name = Heterostraci image caption = Drepanaspis gemuendenensis , accompanied by the placoderm Tiaraspis subtilis fossil range = Silurian Devonian |regnum = Animalia phylum = Chordata classis = Heterostraci subdivision ranks = Orders… …   Wikipedia

  • Thelodonti — Temporal range: 453–359 Ma …   Wikipedia

  • fish — fishless, adj. /fish/, n., pl. (esp. collectively) fish, (esp. referring to two or more kinds or species) fishes, v. n. 1. any of various cold blooded, aquatic vertebrates, having gills, commonly fins, and typically an elongated body covered with …   Universalium

  • Fish — /fish/, n. Hamilton, 1808 93, U.S. statesman: secretary of state 1869 77. * * * I Any of more than 24,000 species of cold blooded vertebrates found worldwide in fresh and salt water. Living species range from the primitive lampreys and hagfishes… …   Universalium

  • hormone — hormonal, hormonic /hawr mon ik, moh nik/, adj. /hawr mohn/, n. 1. Biochem. any of various internally secreted compounds, as insulin or thyroxine, formed in endocrine glands, that affect the functions of specifically receptive organs or tissues… …   Universalium

  • Devonian Period — Interval of geologic time from 417 to 354 million years ago; it was the fourth period of the Paleozoic Era. During the Devonian, a giant continent was situated in the Southern Hemisphere (see Gondwana), and other landmasses were located in the… …   Universalium

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