Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Mollusca Linnaeus, 1758 - molluscs
     Subphylum Diasoma Runnegar & Pojeta Jr., 1974 see Phylum Mollusca Linnaeus, 1758
       1 Class †Rostroconchia Pojeta et al., 1972
       1.n.1 Class Scaphopoda Bronn, 1862 - tusk shells
       1.n.2 Class Pelecypoda Goldfuss, 1820 see Class Bivalvia Linnaeus, 1758