Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Gastropoda Cuvier, 1795 - snails and slugs
     Subclass Divasibranchia Minichev & Starobogatov, 1975
       Order Basommatophora Keferstein, 1865 see Suborder Basommatophora Keferstein, in Bronn, 1864
         Superfamily Planorbioidea Vaught, 1989, orth. inval. see Superfamily Planorboidea Rafinesque, 1815
           Family Bulinidae Fischer & Crosse, 1880 see Subfamily Bulininae Fischer & Crosse, 1880
             Subfamily Plesiophysinae Bequaert & Clench, 1939 [monotypic] see Tribe Plesiophysini Bequaert & Clench, 1939
               1 Genus Plesiophysa Fischer, 1883