单词 | anaspid |
释义 | anaspid (extremely rare) n WORD FAMILY anaspid n extinct small freshwater jawless fish usually having a heterocercal tail and an armored head; of the Silurian and Devonian Hyper agnathan, jawless fish, jawless vertebrate eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms |
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