Nuculanida is an order of very small saltwater clams, marine bivalve molluscs in the subclass Protobranchia.
These bivalves are distinguished by the presence of relatively primitive, "protobranchiate" gills. There are a row of short teeth along the hinge of the shell. The shells are often internally nacreous.[1]
Families within the order Nuculanida include:
Nuculanida is an order of very small saltwater clams, marine bivalve molluscs in the subclass Protobranchia.