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 Siphonarioidea Gray, 1827
           1 Family Trimusculidae Burch, 1945 (1840) [monotypic]
           2 Family Siphonariidae Gray, 1827
           3 Family Acroreiidae Cossmann, 1893 [monotypic]