Inoceramidae

The Inoceramidae are an extinct family of bivalves ("clams") in the Class Mollusca. Fossils of inoceramids are found in marine sediments of Permian to latest Cretaceous in age. Inoceramids tended to live in upper bathyal and neritic environments. Many species of inoceramid are found all over the world, demonstrating the wide distribution of their preferred ecosystems, and possibly long-lived planktotrophic larvae. Despite their wide distribution, the pace of evolution of inoceramids was great, with species ranges commonly averaging 0.2-0.5 Ma.

== Size == right|thumb|Gigantic specimen of Inoceramus steenstrupi across, from Greenland Various species of inoceramids have achieved shell sizes ranging from small to large. Members of the Inoceramus and Cladoceramus genera have shells of more than in length. In 1952, a huge specimen of Inoceramus steenstrupi long, was found in Qilakitsoq, the Nuussuaq Peninsula, Greenland. This fossil is 83 Ma old, the Upper Santonian or Lower Campanian stage. Specimens referred to Antarcticeramus are also gigantic, some around 1.8 m and shell thicknesses of 3 cm.