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 (9 ft 10 in) 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 fossilised themselves. The outer shell often provided habitat for its own juveniles, also for oysters such as the epizoic oyster Pseudoperna congesta, and barnacles.
Shells containing pearls have also been discovered.
- Everhart, Mike (2009). "Oyster-shell coprolites; a stratigraphic marker in the smoky hill chalk (Upper Cretaceous) of Western Kansas". Transactions of the Kansas Academy of Science: Abstracts. 11: 12.
- 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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