placoderm definition

  • noun:
    • some of various extinct fishes associated with Silurian and Devonian times, characterized by bony dishes of armor since the mind and flanks, hinged jaws, and paired fins.
    • A member of an extinct set of seafood with armored minds; the group lived throughout the Silurian and Devonian durations.
    • among Placodermi.
    • A ganoid fish of this group Placodermi.
    • fish-like vertebrate with bony dishes on head and torso; prominent in seas and streams during the Devonian; considered the initial vertebrate with jaws
  • others:
    • Having the skin covered with wide flat plates, as a fish; from the Placodermi.

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