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 Pomatiopsidae Stimpson, 1865
             Subfamily Pomatiopsinae Stimpson, 1865
               Tribe Pomatiopsini Stimpson, 1865 see Subfamily Pomatiopsinae Stimpson, 1865
                 Genus Idiopyrgus Pilsbry, 1911