anaspid
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Noun | 1. | anaspid - extinct small freshwater jawless fish usually having a heterocercal tail and an armored head; of the Silurian and Devonian agnathan, jawless fish, jawless vertebrate - eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms Anaspida, order Anaspida - extinct order of jawless vertebrates |
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