Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Gastropoda Cuvier, 1795 - snails and slugs
     Subclass Opisthobranchia Milne-Edwards, 1848 - opisthobranchs see Order Opisthobranchia Milne-Edwards, 1848
       Order Sacoglossa Ihering, 1876 - sacoglossans
         Suborder Tamanovalvina
           Superfamily Julioidea see Superfamily Oxynooidea Stoliczka, 1868 (1847)
             Family Volvatellidae Pilsbry, 1895
               1 Genus Ascobulla Marcus, 1972
               2 Genus Volvatella Pease, 1860