anaspid

Noun
  1. Extinct small freshwater jawless fish usually having a heterocercal tail and an armored head;
    Of the Silurian and Devonian (synset 101478581)
    is a type of: agnathan, jawless fish, jawless vertebrate - eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms
    belongs to: anaspida, order anaspida - extinct order of jawless vertebrates

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