Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Gastropoda Cuvier, 1795 - snails and slugs
     Subclass Prosobranchia Milne-Edwards, 1848 - prosobranchs see Class Gastropoda Cuvier, 1795
       Order Caenogastropoda Cox, 1960 see Superorder Caenogastropoda Cox, 1960
         Suborder Neotaenioglossa Haller, 1882 see Order Sorbeoconcha Ponder & Lindberg, 1997
           Superfamily Trivioidea F.H. Troschel, 1863 see Superfamily Velutinoidea Gray, 1840
             Family Triviidae Troschel, 1863 - trivias
               Subfamily Triviinae Troschel, 1863
                 Tribe Pusulini Schilder, 1936 see Subfamily Triviinae Troschel, 1863
                   Genus Pusula Jousseaume, 1884
                     Subgenus Circumscapula Cate, 1979