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]