| 单词 | round-mouth |
| 释义 | > as lemmasround-mouth round-mouth n. Zoology a vertebrate of the subclass Cyclostomata, which comprises the jawless fishes such as lampreys; a cyclostome.Chiefly as a gloss of the words cyclostome or Cyclostomata. ΚΠ 1836 J. Richardson Fauna Boreali-Americana III. 292 The suckers of Cuvier, or cyclostomes (round mouths) of Dumeril, forming the second family of the cartilaginous fish with fixed gills. 1886 Athenæum May 618/3 The round-mouths, such as the lamprey, which differ from all other vertebrates in the constitution of their mouth. a1933 J. A. Thomson Biol. for Everyman (1934) I. ii. 21 Primitive Classes: Round-mouths, Lancelets, Sea-squirts, and Enteropneusts. 1997 G. S. Helfman et al. Diversity of Fishes xiii. 198/2 Although traditionally treated as related orders in the subclass Cyclostomata (round mouths), similarities in the body morphology of modern hagfishes and lampreys are likely the result of convergent evolution. < as lemmas |
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