order anaspida

Noun
  1. Extinct order of jawless vertebrates (synset 101478435)
    is a type of: animal order - the order of animals
    member holonym: anaspid - extinct small freshwater jawless fish usually having a heterocercal tail and an armored head; of the Silurian and Devonian
    belongs to: agnatha, superclass agnatha - superclass of eel-shaped chordates lacking jaws and pelvic fins: lampreys; hagfishes; some extinct forms
    same as: anaspida

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