Cretaceous genus extinctions

Pleurotomaria is an extinct genus of sea snails, marine gastropod molluscs in the family Pleurotomariidae.

Betelgeusia is an extinct genus of sea stars in the family Radiasteridae. It was described by Blake and Reid, in 1998, and existed in what is now the Netherlands, Texas, United States, Morocco, and India, during the Middle Jurassic through the Cretaceous period. It contains the species B. brezinai, B. exposita, B. riedi, and B. orientalis.