Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Gastropoda Cuvier, 1795 - snails and slugs
     Subclass Divasibranchia Minichev & Starobogatov, 1975
       Order Stylommatophora Schmidt, 1855 see Infraorder Stylommatophora Schmidt, 1855
         (Achatinid Sigmurethra)
           Suborder Sigmurethra Pilsbry, 1900 see Group Sigmurethra Pilsbry, 1900
             Superfamily Streptaxoidea Gray, 1860 [monotypic]
               Family Streptaxidae Gray, 1860
                 Subfamily Enneinae Bourguignat, 1883
                   Genus Gulella Pfeiffer, 1856
                     01 Subgenus Aenigmigulella Pilsbry & Cockerell, 1933
                     02 Subgenus Avakubia Pilsbry, 1919
                     03 Subgenus Conogulella Pilsbry, 1919
                     04 Subgenus Costigulella Pilsbry, 1919
                     05 Subgenus Plicigulella Pilsbry, 1919
                     06 Subgenus Primigulella Pilsbry, 1919
                     07 Subgenus Silvigulella Pilsbry, 1919
                     08 Subgenus Tortigulella Pilsbry, 1919
                     09 Subgenus Digulella Haas, 1934
                     10 Subgenus Huttonella Pfeiffer, 1856
                     11 Subgenus Uniplicaria Pfeiffer, 1856
                     12 Subgenus Miragulella Vaught, 1989, orth. inval. see Subgenus Mirigulella Pilsbry & Cockerell, 1933
                     13 Subgenus Molarella Connolly, 1922
                     14 Subgenus Paucidentella Thiele, 1933
                     15 Subgenus Paucidentina Martens, 1897
                     16 Subgenus Rhabdogulella Haas, 1934
                     17 Subgenus Sphincterocochlion Verdcourt, 1985