Nuculanoida

Nuculanoida
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Bivalvia
Subclass:	Protobranchia
Order:	Nuculanoida
Families
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Nuculanoida 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.

Families within the order Nuculanoida include:

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