Phylum Mollusca Linnaeus, 1758 - molluscs
   Subphylum Conchifera Gegenbauer, 1878
     Class Gastropoda Cuvier, 1795 - snails and slugs
       Subclass Orthogastropoda Ponder & Lindberg, 1995
         Superorder Heterobranchia Burmeister, 1837
           Order Opisthobranchia Milne-Edwards, 1848
             Suborder Sacoglossa Ihering, 1876 see Order Sacoglossa Ihering, 1876
               Superfamily Oxynooidea Stoliczka, 1868 (1847)
                 1 Family Oxynoidae Stoliczka, 1868 (1847)
                 2 Family Juliidae Smith, 1885
                 3 Family Volvatellidae Pilsbry, 1895