Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Gastropoda Cuvier, 1795 - snails and slugs
     Subclass Prosobranchia Milne-Edwards, 1848 - prosobranchs see Class Gastropoda Cuvier, 1795
       Order Caenogastropoda Cox, 1960 see Superorder Caenogastropoda Cox, 1960
         Suborder Architaenioglossa Haller, 1890
           Superfamily Cyclophoroidea Gray, 1847
             Family Diplommatinidae Pfeiffer, 1856
               Subfamily Cochlostomatinae Kobelt, 1902 [monotypic]
                 Genus Cochlostoma Jan, 1830
                   1 Subgenus Auritus Westerlund, 1883
                   2 Subgenus Holcopoma Kobelt & Möllendorff, 1899
                   3 Subgenus Obscurella Clessin, 1889
                   4 Subgenus Personatus Westerlund, 1883
                   5 Subgenus Titanopoma Wagner, 1897
                   6 Subgenus Turritus Westerlund, 1883