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 fossilised themselves. The outer shell often provided habitat for its own juveniles, also for oysters such as the epizootic oyster Pseudoperna congesta  as shown in the image here, and barnacles.
Shells containing pearls have also been discovered.
- OYSTER-SHELL COPROLITES; A STRATIGRAPHIC MARKER IN THE SMOKY HILL CHALK (Upper Cretaceous) of Western Kansas, Kansas Academy of Science, Transactions 11(Abstracts):12.© 2001-2009 by Mike Eberhart 2009 "These structures are made up almost entirely of shell fragments from the epizootic oyster Pseudoperna congesta with single, small pieces of juvenile inoceramid shell occurring" 
- OYSTER-SHELL COPROLITES; A STRATIGRAPHIC MARKER IN THE SMOKY HILL CHALK (Upper Cretaceous) of Western Kansas, Kansas Academy of Science, Transactions 11(Abstracts):12.© 2001-2009 by Mike Eberhart 2009, "Biostratigraphically, these shell masses are found in association with the large bivalves Volviceramus grandis and Platyceramus platinum 
- 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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