英语词汇“rudist”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

rudist

/ˈruːdɪst

(also rudistid /ruːˈdɪstɪd/)

noun

A cone-shaped fossil bivalve mollusc which formed colonies resembling reefs in the Cretaceous period.

Superfamily Rudistacea, order Hippuritoida.

An extinct group of Mesozoic bivalves, the rudistids, became closely adapted to a cemented mode of life: one valve became conical while the other formed a lid....

Cretaceous radiations of rudists were apparently initiated during periods of globally high sea level and the Lebanon decapod faunas are a part of this general increasing invertebrate diversity.
This member contains abundant and diverse mid-Cretaceous shallow-marine invertebrates, including reef corals and rudist bivalves.

Origin

Late 19th century: from modern Latin Rudista (former group name), from Latin rudis 'rude'; for the variant spelling see -id³.

单词	rudist
释义	rudist /ˈruːdɪst / (also rudistid /ruːˈdɪstɪd/) noun A cone-shaped fossil bivalve mollusc which formed colonies resembling reefs in the Cretaceous period. Superfamily Rudistacea, order Hippuritoida. An extinct group of Mesozoic bivalves, the rudistids, became closely adapted to a cemented mode of life: one valve became conical while the other formed a lid.... Cretaceous radiations of rudists were apparently initiated during periods of globally high sea level and the Lebanon decapod faunas are a part of this general increasing invertebrate diversity. This member contains abundant and diverse mid-Cretaceous shallow-marine invertebrates, including reef corals and rudist bivalves. Origin Late 19th century: from modern Latin Rudista (former group name), from Latin rudis 'rude'; for the variant spelling see -id³.
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