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 Simniini Schilder, 1927 see Tribe Ovulini Fleming, 1822
                   Genus Phenacovolva Iredale, 1930
                     1 Subgenus Phenacovolva Iredale, 1930
                     2 Subgenus Calcarovula Cate, 1973
                     3 Subgenus Takasagovolva Azuma, 1974
                     4 Subgenus Kurodaovula Azuma, 1987
                     5 Subgenus Turbovula Cate, 1973