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Platyceramus platinus
Dinosaurs are not the only group of organisms to disappear above Cretaceous strata. Inoceramids, a family of large bivalves, are also extinct and not found in Cenozoic layers. Remains of fish have been found preserved within some specimens of this giant clam, leading to the suggestion of possible commensalism or symbiosis. Specimen on display at the Denver Museum of Nature and Science.