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
         Suborder Orthurethra Pilsbry, 1900
           Superfamily Pupilloidea Turton, 1831
             Family Orculidae Pilsbry, 1918
               Genus Orcula Held, 1837
                 1 Subgenus Pilorcula Germain, 1912
                 2 Subgenus Sphyradium Charpentier, 1837