Bathyspinulidae
Bathyspinulidae is a family of bivalves belonging to the order Nuculanida 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 s .... Genera: * '' Tindariopsis'' Verrill & Bush, 1897 References Nuculanida Bivalve families {{bivalve-stub ...
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Nuculanida
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 Praenuculidae is an extinct family of prehistoric bivalves in the superfamily Nuculoidea. Praenuculidae species lived from the early Ordovician, Arenig stage through the Early Devonian Emsian stage.

Bivalve
Bivalvia (), in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of marine and freshwater molluscs that have laterally compressed bodies enclosed by a shell consisting of two hinged parts. As a group, bivalves have no head and they lack some usual molluscan organs, like the radula and the odontophore. They include the clams, oysters, cockles, mussels, scallops, and numerous other families that live in saltwater, as well as a number of families that live in freshwater. The majority are filter feeders. The gills have evolved into ctenidia, specialised organs for feeding and breathing. Most bivalves bury themselves in sediment, where they are relatively safe from predation. Others lie on the sea floor or attach themselves to rocks or other hard surfaces. Some bivalves, such as the scallops and file shells, can swim. The shipworms bore into wood, clay, or stone and live inside these substances. The shell of a bivalve is composed of calc ...
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