| 单词 | gnathostome |
| 释义 | gnathostome|ˈneɪθəʊstəʊm|
[a. G. gnathostome (E. Haeckel Anthropogenie (1874) xviii. 432), f. gnatho- + stoma.]
A member of the Gnathostomata, a superclass of vertebrates with fully developed upper and lower jaws. Also as adj., of or pertaining to this group. Also gnathoˈstom(at)ous a.
1889Cent. Dict., Gnathostomatous. 1905J. McCabe tr. Haeckel's Evol. Man II. xxi. 560 All the vertebrates or gnathostomes, from the fishes to man, descend from a common, extinct, fish-like ancestor. 1908W. H. Gaskell Orig. Vertebr. i. 60 From such gnathostomatous fishes the cyclostomes were supposed to have descended. 1909E. S. Goodrich in R. Lankester Treat. Zool. IX. 92 The Gnathostomes might be divided into the Ichthyomorpha (Pisces) and the Tetrapoda (Amphibia, Reptilia, Aves, Mammalia). 1933A. S. Romer Vertebr. Paleont. iii. 35 All possess jaws, structures indicating so great and significant an advance that these forms..are often spoken of as gnathostomes (‘jaw-mouthed’). 1936Neal & Rand Compar. Anat. viii. 305 Gnathostome fishes have an immovable tongue. 1954G. C. Kent Compar. Anat. Vertebr. iii. 48 Agnathons lack true jaws..; all other vertebrates, because they exhibit jaws, are gnathostomes. 1968R. Zangerl tr. Peyer's Compar. Odontology 30 The placoderms are all more or less clearly gnathostomous. |
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