Phylum [Mollusca] Linnaeus, 1758 - molluscs
   Class Gastropoda Cuvier, 1795 - snails and slugs
     Subclass Prosobranchia Milne-Edwards, 1848 - prosobranchs see Class Gastropoda Cuvier, 1795
       Order Mesogastropoda Thiele, 1925 - mesogastropods see [unranked] mesogastropods
         Suborder Taenioglossa see Order Mesogastropoda Thiele, 1925
           Superfamily Cypraeacea see Superfamily Cypraeoidea Rafinesque, 1815
             Family Ovulidae Fleming, 1822 - egg snails
               Subfamily Ovulinae Fleming, 1822
                 1 Genus Calpurnus Montfort, 1810
                 2 Genus Crenavolva Cate, 1973
                 3 Genus Delonovolva Cate, 1973
                 4 Genus Dentiovula Habe, 1961
                 5 Genus Ovula Bruguière, 1789
                 6 Genus Prionovula Iredale, 1930
                 7 Genus Pseudosimnia Schilder, 1927
                 8 Genus Testudovula Cate, 1973