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 Physoidea Fitzinger, 1833 [monotypic]
           Family Physidae Fitzinger, 1833
             Genus Physa Draparnaud, 1801
               Subgenus Petrophysa Pilsbry, 1926