Phylum Mollusca Linnaeus, 1758 - molluscs Class Bivalvia Linnaeus, 1758 - bivalves Subclass Protobranchia Pelseneer, 1889 Order Nuculida Dall, 1889 Superfamily †Ctenodontoidea Wöhrmann, 1893, nom. illeg. [monotypic] Family †Ctenodontidae Wöhrmann, 1893, nom. illeg. Genus †Dystactella Hall & Whitfield, 1872