Bivalve taxonomy

Heteroconchia is a taxonomic infraclass of diverse bivalve molluscs, belonging to the subclass Autobranchia.

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.

Palaeoheterodonta is a subterclass of bivalve molluscs. It contains the extant orders Unionida (freshwater mussels) and Trigoniida. They are distinguished by having the two halves of the shell be of equal size and shape, but by having the hinge teeth be in a single row, rather than separated into two groups, as they are in the clams and cockles.

Protobranchia is a subclass of bivalve molluscs. It contains the extant orders Nuculanida, Nuculida, and Solemyida.

Extinct genus of bivalves

Euheterodonta is an subterclass of Mollusca in the class Bivalvia.

Imparidentia is a major clade of bivalves named by Bieler, Mikkelsen, and Giribet in 2014; this clade, commonly recovered in phylogenetic analyses, consists of all euheterodonts other than the anomalodesmatans. The name comes from Latin impar "unequal" and dens "tooth", in reference to the unequal hinge teeth seen in members of the clade. The relationships among members of Imparidentia are uncertain.

Pectinina is a taxonomic grouping of saltwater clams, a suborder within the order Pectinida of marine bivalve molluscs.