Jurassic genus first appearances

Exogyra is an extinct genus of marine oysters that belongs to the family Gryphaeidae (honeycomb oysters). These bivalves were cemented by the more cupped left valve. The right valve is flatter, and the beak is curved to one side. Exogyra lived on solid substrates in warm seas during the Jurassic and Cretaceous periods.

Glyphea is a genus of fossil glypheoid crustaceans that lived from the Jurassic to the Eocene. It includes the following species:

Nerinea is an extinct genus of fossil sea snails, marine gastropod molluscs in the clade Heterobranchia.