Anaspida
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| Noun | 1. | Anaspida - extinct order of jawless vertebrates animal order - the order of animals Agnatha, superclass Agnatha - superclass of eel-shaped chordates lacking jaws and pelvic fins: lampreys; hagfishes; some extinct forms anaspid - extinct small freshwater jawless fish usually having a heterocercal tail and an armored head; of the Silurian and Devonian |
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