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
                   01 Genus Ovula Bruguière, 1789
                   02 Genus Aperiovula Cate, 1973
                   03 Genus Calpurnus Montfort, 1810
                   04 Genus Carpiscula Cate, 1973
                   05 Genus Crenavolva Cate, 1973
                   06 Genus Cyphoma Röding, 1798
                   07 Genus Delonovolva Cate, 1973
                   08 Genus Dentiovula Habe, 1961
                   09 Genus Galeravolva Cate, 1973
                   10 Genus Globovula Cate, 1973
                   11 Genus Habuprionovolva Azuma, 1970
                   12 Genus Lacrima Cate, 1973
                   13 Genus Margovula Iredale, 1935
                   14 Genus Neosimnia Fischer, 1884
                   15 Genus Pellasimnia Iredale, 1931
                   16 Genus Prionovolva Iredale, 1930
                   17 Genus Primovula Thiele, 1925
                   18 Genus Pseudocyphoma Cate, 1973
                   19 Genus Pseudosimnia Schilder, 1927
                   20 Genus Rotaovula Cate & Azuma, 1973
                   21 Genus Sandalia Cate, 1973
                   22 Genus Spiculata Cate, 1973
                   23 Genus Stohleroma Cate, 1973
                   24 Genus Testudovolva Cate, 1973