| 释义 |
pteropod|ˈtɛrəpɒd|
[ad. mod.L. Pteropoda, a. F. ptéropode (G. Cuvier 1804, in Ann. Mus. Hist. Nat. IV. 232): see pteropoda.]
a. Zool. A pelagic marine gastropod belonging to the class Pteropoda, which includes molluscs having a modified foot bearing lobes which act as fins; a sea butterfly.
1835Kirby Hab. & Inst. Anim. I. ix. 269 The Pteropods..having no means of fixing themselves like most of the bivalves, float continually in the ocean. 1877T. H. Huxley Man. Anat. Invertebr. Animals viii. 505 In all Pteropods and Branchiogasteropods, the mantle secretes a cuticular shell. 1883C. F. Holder in Harper's Mag. Jan. 187/1 With what grace the little pteropod Cleodora moves along! 1890[see butterfly snail]. 1934W. Beebe Half Mile Down ix. 167 At 1825 feet coiled pteropods..appeared by the dozen. 1956A. Hardy Open Sea I. xii. 228 The deep-water pteropods are dark in colour. 1976Sci. Amer. July 95/1 The pteropods, wing-footed marine snails, collect phytoplankton on floating webs of sticky mucus.
b. pteropod ooze, a calcareous marine sediment rich in the remains of the tests of pteropods.
1891Murray & Renard in Rep. Sci. Results Voy. H.M.S. Challenger: Deep-Sea Deposits iii. 223 Pteropod Ooze. This name was employed by Mr. Murray during the cruise of the Challenger to designate those deep-sea deposits in which a very large part of the calcareous organisms consists of the dead shells of Pteropods and Heteropods. 1894S. J. Hickson in Pop. Sci. Monthly XLIV. 470 The pteropod ooze has only twenty-five per cent. of carbonate of lime. 1929A. Conan Doyle Maracot Deep 17 We would bring up..a scoop of pteropod ooze. 1967Oceanogr. & Marine Biol. V. 51 To the South of New Caledonia..there is a small zone of pteropod ooze. |