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AGNATHAN
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I. (noun)
Sense 1
Meaning:
Eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms
Synonyms:
agnathan; jawless fish; jawless vertebrate
Classified under:
Hypernyms ("agnathan" is a kind of...):
aquatic vertebrate (animal living wholly or chiefly in or on water)
Hyponyms (each of the following is a kind of "agnathan"):
ostracoderm (extinct fish-like jawless vertebrate having a heavily armored body; of the Paleozoic)
heterostracan (extinct jawless fish with the anterior part of the body covered with bony plates; of the Silurian and Devonian)
cephalaspid; osteostracan (extinct jawless fish of the Devonian with armored head)
anaspid (extinct small freshwater jawless fish usually having a heterocercal tail and an armored head; of the Silurian and Devonian)
conodont (small (2 inches long) extinct eellike fish with a finned tail and a notochord and having cone-shaped teeth containing cellular bone; late Cambrian to late Triassic; possible predecessor of the cyclostomes)
cyclostome (primitive aquatic vertebrate)
lamper eel; lamprey; lamprey eel (primitive eellike freshwater or anadromous cyclostome having round sucking mouth with a rasping tongue)
hag; hagfish; slime eels (eellike cyclostome having a tongue with horny teeth in a round mouth surrounded by eight tentacles; feeds on dead or trapped fishes by boring into their bodies)
Holonyms ("agnathan" is a member of...):
Agnatha; superclass Agnatha (superclass of eel-shaped chordates lacking jaws and pelvic fins: lampreys; hagfishes; some extinct forms)
