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
             1 Family Triviidae Troschel, 1863 - trivias
             2 Family Eratoidae T. Gill, 1871 - coffee bean shells see Tribe Eratoini Gill, 1871
             3 Family Pseudosacculidae Kuroda, 1933 [monotypic] see Subfamily Lamellariinae d'Orbigny, 1841
             4 Family Ovulidae Fleming, 1822 - egg snails
             5 Family Pediculariidae J.E. Gray, 1853 [monotypic] see Subfamily Pediculariinae Gray, 1853