jawless fish

Noun
  1. Eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms (synset 101476924)
    is a type of: aquatic vertebrate - animal living wholly or chiefly in or on water
    subtypes:
    • 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
    belongs to: agnatha, superclass agnatha - superclass of eel-shaped chordates lacking jaws and pelvic fins: lampreys; hagfishes; some extinct forms
    same as: agnathan, jawless vertebrate

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