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
         (Helicid Sigmurethra)
           Superfamily Sagdoidea Pilsbry, 1895 [monotypic]
             Family Sagdidae Pilsbry, 1895
               Subfamily Sagdinae Pilsbry, 1895
                 01 Genus Sagda Beck, 1837
                 02 Genus Hojeda Baker, 1926
                 03 Genus Hyalosagda Albers, 1860
                 04 Genus Lacteoluna Pilsbry, 1926
                 05 Genus Meiophysema Baker, 1935
                 06 Genus Odontosagda Martens, 1860
                 07 Genus Proserpinula Albers, 1860
                 08 Genus Stauroglypta Baker, 1935
                 09 Genus Trifaux Baker, 1935
                 10 Genus Volvidens Henderson, 1914
                 11 Genus Xenodiscula Pilsbry, 1919
                 12 Genus Zaphysema Pilsbry, 1894