Kingdom Animalia Linnaeus, 1758 - animals Phylum Mollusca Linnaeus, 1758 - molluscs Subphylum Diasoma Runnegar & Pojeta Jr., 1974 see Phylum Mollusca Linnaeus, 1758 Class Pelecypoda Goldfuss, 1820 see Class Bivalvia Linnaeus, 1758 Subclass Isofilibranchia Iredale, 1939 see Superorder Isofilibranchia Iredale, 1939 Genus Geukensia van de Poel, 1959