| 单词 |
acraniate |
| 释义 |
acraniate, a. and n. Zool.|eɪˈkreɪnɪət|
[f. a- 14 + craniate a. and n.]
A. adj. Lacking a skull or cranium; acranial; spec. belonging to the subphylum Cephalochordata (formerly Acrania), of the phylum Chordata, which contains the lancelets.
B. n. An acraniate organism.
1879A. S. Packard Zool. viii. 401 The Vertebrates are divided into the skulless or acraniate..and the skulled or craniate (Craniata). 1893Stud. Biol. Lab. Johns Hopkins Univ. V. 213 (title) An undescribed acraniate: asymmetron lucayanum. 1894A. Willey Amphioxus & Ancestry of Vertebrates ii. 46 Amphioxus, while possessing the general facies of a fish..has no skull, or, in other words..is Acraniate. 1977Compar. Biochem. & Physiol. B. LVII. 167/1 The phylogenetic interrelationships between the three chordate subphyla, namely the tunicates, the acraniates, and the vertebrates, are still quite obscure. 1987Gen. & Compar. Endocrinol. LXVI. 40 Of the four groups of chordates, tunicates,..appendicularians, acraniates, and craniates, the first three groups are suspension feeders. |
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