Pteriomorphia

Summary

The Pteriomorphia are a subclass of saltwater clams, marine bivalve molluscs. They contain several major orders, including the Arcida, Ostreida, Pectinida, Limida, Mytilida, and Pteriida. It also contains some extinct and probably basal families, such as the Evyanidae, Colpomyidae, Bakevelliidae, Cassianellidae, and Plicatostylidae.