| 释义 |
rudist|ˈruːdɪst|
Also Rudista.
[a. mod.L. family name Rudista (J. E. Gray in Synopsis Contents Brit. Mus. (ed. 21, 1823) 62), f. L. rudis unformed + -t- + -a 4.]
A fossil pelecypod bivalve mollusc belonging to the superfamily Rudistacea, which included cone-shaped reef-forming animals. Also attrib. Also Ru-, ruˈdistid [-id3], in the same sense.
1889Nicholson & Lydekker Man. Palæont. (ed. 3) I. xxxvi. 734 The Rudistæ are..entirely extinct. 1890Mem. Boston Soc. Nat. Hist. IV. 322/1 The Rudistæ are conical or cup-shaped Pelecypods with a superficially marked radial symmetry. 1935Twenhofel & Shrock Invertebr. Paleontol. ix. 403 The various Rudistids are especially noteworthy. 1959New Scientist 1 Jan. 16/1 A good collection of fossil reef-forming corals, rudistids, and related atoll fauna. 1969Bennison & Wright Geol. Hist. Brit. Isles xiv. 332 The coral-like Rudists are important, forming reef environments in Tethys. 1978Nature 26 Oct. 779/2 Future editions could be improved by the inclusion of a few famous foreign examples such as the Burgess Shale fauna and a rudist reef association. |