Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Gastropoda Cuvier, 1795 - snails and slugs
     Subclass Divasibranchia Minichev & Starobogatov, 1975
       Order Stylommatophora Schmidt, 1855 see Infraorder Stylommatophora Schmidt, 1855
         Suborder Mesurethra [monotypic]
           Superfamily Clausilioidea Gray, 1855 [monotypic]
             Family Clausiliidae Gray, 1855
               Subfamily Megalophaedusinae see Tribe Megalophaedusini Zilch, 1954
                 Genus Megalaphaedusa Millard, 1996, orth. inval. see Genus Megalophaedusa Boettger, 1877
                   1 Subgenus Vastina Ehrmann, 1929