Any chordate animal with a noto-chord and lacking a brain and skull. Acrani-ates include the urochordates and cephalochor-dates. See Cephalochordata,Urochordata.指任何脊索動物中具有脊索而缺乏大腦和頭骨的動物。無頭骨類包括尾索動物和頭索動物。參閱142頁 Cephalo......(本文共 220 字) [閱讀本文] >>
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