| 单词 | ring canal |
| 释义 | > as lemmasring canal ring canal n. Zoology a circular canal around the mouth, esp. one forming part of the digestive system of some coelenterates or the water-vascular system of echinoderms. ΘΚΠ the world > animals > invertebrates > subkingdom Metazoa > grade Diploblastica > phylum Coelenterata > [noun] > member of > parts of > canal forming structure ring canal1869 the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > phylum Echinodermata > [noun] > member of > parts of > canal forming structure ring canal1869 1869 Student & Intellect. Observer 3 418 He has not seen the slightest trace of a ‘ring-canal’ in connection with the contracted vesicle [of Stentor]. 1881 Encycl. Brit. XII. 550/2 The peripheral portion of the lumen of the original enteric cavity forms the ring-canal, which runs all round the margin of the disc, and is continued into the hollow tentacles. 1960 D. C. Braungart & R. Buddeke Introd. Animal Biol. (ed. 5) viii. 103 The stone canal conducts the water from the madreporite down into a ring canal that encircles the mouth. 1995 C. Nielsen Animal Evol. xlviii. 368 Echinoderms... Radial canals extend from the ring canal along the body wall, giving rise to a double row of tube feet. < as lemmas |
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