Mollusca Linnaeus, 1758 - molluscs see Phylum Mollusca Linnaeus, 1758
   Gastropoda Cuvier, 1795 see Class Gastropoda Cuvier, 1795
     Heterobranchia Burmeister, 1837 see Superorder Heterobranchia Burmeister, 1837
       "Lower Heterobranchia"
         Omalogyroidea Sars, 1878
           1 Omalogyridae Sars, 1878
           2 †Stuoraxidae Bandel, 1994