placoderm

Noun
  1. Fish-like vertebrate with bony plates on head and upper body;
    Dominant in seas and rivers during the Devonian;
    Considered the earliest vertebrate with jaws (synset 101482747)
    is a type of: aquatic vertebrate - animal living wholly or chiefly in or on water
    belongs to: class placodermi, placodermi - extinct group of bony-plated fishes with primitive jaws

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