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Class BivalviaDomain Eukarya Kingdom Animalia Sub-kingdom Eumetazoa Sub-sub-kingdom Bilateria Metaphylum Schizocoelos Coelomates Phylum Mollusca Class Bivalvia This group of molluscs includes the clams, mussels, scallops and oysters. The body is greatly flattened laterally and th shell is composed of two lateral, hinged valves. There are about 11,000 species of bivalves. Latin: bi, two + valva, valve. (Dorit et al, 1991) Subclass Lamellibranchia Subclass Protobranchia Subclass Septibranchia |