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
               Family Microceramidae Pilsbry, 1903 [monotypic] see Subfamily Microceraminae Pilsbry, 1904
                 Genus Microceramus Pilsbry & Vanatta, 1898
                   Subgenus Spiroceramus Pilsbry & Vanatta, 1898