Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Gastropoda Cuvier, 1795 - snails and slugs
     Subclass Heterobranchia Burmeister, 1837 [monotypic] see Superorder Heterobranchia Burmeister, 1837
       Order Heterostropha Fischer, 1885
         1 Superfamily Rissoelloidea Gray, 1850
         2 Superfamily Architectonicoidea Gray, 1850
         3 Superfamily Pyramidelloidea Gray, 1840
         4 Superfamily Valvatoidea Gray, 1840