Phylum [Mollusca] Linnaeus, 1758 - molluscs
   Class Gastropoda Cuvier, 1795 - snails and slugs
     Subclass Prosobranchia Milne-Edwards, 1848 - prosobranchs see Class Gastropoda Cuvier, 1795
       Order Heterogastropoda see Superfamily Heterogastropoda
         Suborder Ptenoglossa Gray, 1853 see Infraorder Ptenoglossa Gray, 1853
           Superfamily Architectonicacea Gray, 1840, nom. illeg. see Superfamily Architectonicoidea Gray, 1850
             Family Architectonicidae Gray, 1850
               Subfamily Architectonicinae J.E. Gray, 1850 see Family Architectonicidae Gray, 1850
                 Genus Philippia Gray, 1847
                   Subgenus Philippia (Psilaxis) Woodring, 1828