Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Mollusca Linnaeus, 1758 - molluscs
     Subphylum Cyrtosoma Runnegar & Pojeta Jr., 1974 see Phylum Mollusca Linnaeus, 1758
       1 Class Monoplacophora Odhner, 1940 - monoplacophorans
       1.n.1 Class Gastropoda Cuvier, 1795 - snails and slugs
       1.n.2 Class Cephalopoda Cuvier, 1795 - cephalopods