Clams, oysters, mussels and scallops: mollusks enclosed within a shell made of two hinged valves, with no distinct head and, in most species, a life spent filter-feeding while partly or fully buried in sediment or attached to a hard surface. Bivalvia is exclusively aquatic, in both marine and freshwater habitats.
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Disputed
Member Species/Taxa CountApproximate described-species (or, for a genus, described-taxon) count; continually revised as species are newly described, reclassified or synonymized. Taxonomic Rank Scientific Name Connections
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