| 单词 | heterostracan |
| 释义 | heterostracan (extremely rare) n WORD FAMILY heterostracan n extinct jawless fish with the anterior part of the body covered with bony plates; 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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