Nuculanida is an order of very small saltwater clams, marine bivalve molluscs in the subclass Protobranchia.
Description 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 Families within the order Nuculanida include: Bathyspinulidae Coan & Scott, 1997 Lametilidae Malletiidae H. and A. Adams, 1858 Neilonellidae Schileyko, 1989 Nuculanidae H. Adams & A. Adams, 1858 Sareptidae Stoliczka, 1871 Siliculidae Allen and Sanders, 1973 Tindariidae Verrill and Bush, 1897 Yoldiidae Habe, 1977 Praenuculidae Mcalester, 1969 (?) Pristiglomidae Sanders and Allen, 1973 (?)
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