| 单词 | protochordata |
| 释义 | ProtochordataProtochordata[¦prōd·ō·kȯr′dad·ə]ProtochordataProtochordataa division of the phylum Chordata, including the Hemichordata, Urochorda and Cephalochorda. The group lacks a vertebral column, cranium and organs associated with the region of the head in other chordates, but has a dorsal nerve chord and gill slits. |
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