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 Ptenoglossa Gray, 1853 see Infraorder Ptenoglossa Gray, 1853
           Superfamily Janthinoidea Lamarck, 1822 see Superfamily Epitonioidea Berry, 1910 (1812)
             Family Epitoniidae Berry, 1910 (1812) - wentletraps
               Subfamily Epitoniinae Berry, 1910 (1812) see Family Epitoniidae Berry, 1910 (1812)
                 Genus Epitonium Röding, 1798
                   01 Subgenus Epitonium Röding, 1798
                   02 Subgenus Asperiscala de Boury, 1909
                   03 Subgenus Connexiscala de Boury, 1909
                   04 Subgenus Crisposcala de Boury, 1886
                   05 Subgenus Foliaceiscala de Boury, 1912
                   06 Subgenus Globiscala de Boury, 1909
                   07 Subgenus Hirtoscala Monterosato, 1890
                   08 Subgenus Hyaloscala de Boury, 1909
                   09 Subgenus Laeviscala de Boury, 1909
                   10 Subgenus Labeoscala de Boury, 1912
                   11 Subgenus Lamelliscala de Boury, 1909
                   12 Subgenus Librariscala Kilburn, 1985
                   13 Subgenus Limiscala de Boury, 1909
                   14 Subgenus Minutiscala de Boury, 1909
                   15 Subgenus Nipponiscala Millard, 1996, orth. inval.
                   16 Subgenus Papyriscala Boury, 1909 see Genus Papyriscala Boury, 1909
                   17 Subgenus Parviscala de Boury, 1887
                   18 Subgenus Perlucidiscala de Boury, 1912
                   19 Subgenus Pupiscala Masahito, Kuroda & Habe, 1971
                   20 Subgenus Sodaliscala de Boury, 1909