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What (who) is rudist$536282$ - definition
ORDER OF MOLLUSCS (FOSSIL)
Rudistes; Hippuritoida; Rudista; Rudistid; Rudist bivalve; Hippuritidae; Rudist; Hippuritida
![pteriomorph]] ''[[Volviceramus]] grandis'' (right) and the rudist ''[[Durania maxima]]'' (left)](https://commons.wikimedia.org/wiki/Special:FilePath/Volviceramus Durania Pseudoperna.jpg?width=200 "pteriomorph]] ''[[Volviceramus]] grandis'' (right) and the rudist ''[[Durania maxima]]'' (left)")
rudist
['ru:d?st]
¦ noun a cone-shaped fossil bivalve mollusc which formed colonies resembling reefs in the Cretaceous period.
Origin
C19: from mod. L. Rudista (former group name), from L. rudis 'unwrought'.
Rudistes
·noun ·pl An extinct order or suborder of bivalve mollusks characteristic of the Cretaceous period;
- called also Rudista. ·see ·Illust. under Hippurite.
Wikipedia
Rudists
Rudists are a group of extinct box-, tube- or ring-shaped marine heterodont bivalves belonging to the order Hippuritida that arose during the Late Jurassic and became so diverse during the Cretaceous that they were major reef-building organisms in the Tethys Ocean, until their complete extinction at the close of the Cretaceous.
