Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Gastropoda Cuvier, 1795 - snails and slugs
     Subclass Prosobranchia Milne-Edwards, 1848 - prosobranchs see Class Gastropoda Cuvier, 1795
       Order Caenogastropoda Cox, 1960 see Superorder Caenogastropoda Cox, 1960
         Suborder Neotaenioglossa Haller, 1882 see Order Sorbeoconcha Ponder & Lindberg, 1997
           Superfamily Trivioidea F.H. Troschel, 1863 see Superfamily Velutinoidea Gray, 1840
             Family Ovulidae Fleming, 1822 - egg snails
               Subfamily Ovulinae Fleming, 1822
                 Tribe Ovulini Fleming, 1822
                   Genus Pseudosimnia Schilder, 1927
                     1 Subgenus Pseudosimnia Schilder, 1927
                     2 Subgenus Diminovula Iredale, 1930
                     3 Subgenus Inflatovula Cate, 1973
                     4 Subgenus Labiovolva Cate, 1973