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
           1 Family Planorbidae Rafinesque, 1815 - planorbids
           2 Family Bulinidae Fischer & Crosse, 1880 see Subfamily Bulininae Fischer & Crosse, 1880
           3 Family Protancylidae Walker, 1923 [monotypic] see Tribe Miratestini Sarasin & Sarasin, 1897
           4 Family Patelloplanorbidae Franc, 1968 [monotypic] see Tribe Miratestini Sarasin & Sarasin, 1897
           5 Family Neoplanorbidae Hannibal, 1912 see Subfamily Neoplanorbinae Hannibal, 1912
           6 Family Ancylidae Rafinesque, 1815 - freshwater limpets see Tribe Ancylini Rafinesque, 1815