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 Orthalicoidea Martens, 1860
               1 Family Orthalicidae Martens, 1860
               2 Family Odontostomidae Pilsbry & Vanatta, 1898 see Tribe Odontostomini Pilsbry & Vanatta, 1898
               3 Family Amphibulimidae Crosse & Fischer, 1873 see Subfamily Amphibuliminae Fischer, 1873
               4 Family Urocoptidae Pilsbry, 1898 (1868), nom. inq.
               5 Family Cerionidae Pilsbry, 1901 [monotypic]
               6 Family Microceramidae Pilsbry, 1903 [monotypic] see Subfamily Microceraminae Pilsbry, 1904
               7 Family Megaspiridae Pilsbry, 1904
               8 Family Coelociidae Nordsieck, 1986 see Family Coelociontidae Iredale, 1937