Mesozoic molluscs of Europe

thumb|350x350px|Silicified Gryphaea sp. from the Lower Jurassic. Le Liquier, Aveyron, France. Max Rouger collection. Gryphaea, one of the genera known as '''devil's toenails''', is a genus of extinct oysters, marine bivalve mollusks in the family Gryphaeidae.

Platyceramus was a genus of Cretaceous bivalve molluscs belonging to the extinct inoceramid lineage. It is sometimes classified as a subgenus of Inoceramus.