| 释义 |
cephalochordate, n. and a. Zool.
Brit. |ˌkɛf(ə)ləʊˈkɔːdeɪt|, |ˌkɛf(ə)ləʊˈkɔːdət|, U.S. |ˌsɛfəloʊˈkɔrdət|, |ˌsɛfəloʊˈkɔrˌdeɪt|[see also cephalo- comb. form]
[‹ cephalo- comb. form + chordate adj., after Cephalochordata n.]
A. n. An animal of the subphylum Cephalochordata; a lancelet.
1904G. H. Parker Maldive Cephalochordates 39 It is perhaps premature, in view of the rapidly increasing number of species, to discuss at any length the classification of the cephalochordates. 1960J. H. King & J. W. Nichols in R. H. Waters et al. Princ. Compar. Physiol. ii. 29 The larva of a urochordate (an immobile form of chordate) is strikingly similar to the adult amphioxus (a cephalochordate), which is the lowest chordate resembling the vertebrates. 1999Nature 4 Nov. 22/3 Chevron-shaped muscle blocks also occur in cephalochordates (the closest living relatives of vertebrates).
B. adj. Of or relating to the subphylum Cephalochordata.
1938H. S. Rao in B. Prashad Progr. Sci. India xii. 373 Franz..proposed an exhaustive systematic revision of the Cephalochordate genera Branchiostoma and Asymmetron. 1968BioScience 18 878/2 Some cephalochordate species may aggregate simply by being carried to appropriately coarse bottom deposits where they would burrow in and remain. 2002S. J. Gould Struct. Evolutionary Theory x. 1170 Amphioxus, the modern cephalochordate surrogate for an ancestral form, has only one Hox cluster, while gnathostome vertebrates have four. |