最終更新日：2024/08/01

(paleontology) Any of many box-, tube- or ring-shaped marine heterodont bivalves from the Jurassic and Cretaceous periods.

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rudist

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元となった辞書の項目

rudist

noun

(paleontology) Any of many box-, tube- or ring-shaped marine heterodont bivalves from the Jurassic and Cretaceous periods.

The rudist is a type of fossilized marine organism.

意味（1）

(paleontology) Any of many box-, tube- or ring-shaped marine heterodont bivalves from the Jurassic and Cretaceous periods.

In its shallow waters, now-extinct clams known as rudists formed extensive beds.