Temporal range: Cretaceous
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The largest and best known species is P. platinus. Individuals of this species typically reached 1 m (3 ft 3 in) or more in axial length, but fossil specimens 3 m (nearly 10 feet) long have been found, making it the largest known bivalve. Its huge but very thin shell often provided shelter for schools of small fish, some of which became trapped and fossilized themselves, and the outer shell often provided habitat for oysters and barnacles. Shells containing pearls have also been discovered.
- Paleoecology of giant Inoceramidae (Platyceramus) on a Santonian (Cretaceous) seafloor in Colorado
- Natural History Museum: Savage Ancient Seas
- Invertebrate fossils of Kansas article
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