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
         Superfamily Rissooidea Gray, 1847
           Family Baicaliidae Fischer, 1885 see Subfamily Baicaliinae Fischer, 1885
             1 Genus Baicalia Martens, 1876
             2 Genus Pyrgobaicalia Starobogatov, 1972