Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Gastropoda Cuvier, 1795 - snails and slugs
     Subclass Prosobranchia Milne-Edwards, 1848 - prosobranchs see Class Gastropoda Cuvier, 1795
       Order Neogastropoda Wenz, 1938 see Suborder Neogastropoda Wenz, 1938
         Suborder Stenoglossa Bouvier, 1887
           Superfamily Conoidea Fleming, 1822
             Family Turridae Adams & Adams, 1853 (1838) - turret snails
               Subfamily Turrinae Adams & Adams, 1853 (1838)
                 Genus Gemmula Weinkauff, 1875
                   1 Subgenus †Paragemmula Shuto, 1984
                   2 Subgenus Pinguigemmula MacNeil, 1960
                   3 Subgenus Ptychosyrinx Thiele, 1925
                   4 Subgenus Unedogemmula MacNeil, 1960
                   5 Subgenus Gemmula Weinkauff, 1875