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 Calyptraeoidea Lamarck, 1809
             Family Calyptraeidae Lamarck, 1809 - slipper snails and shelf limpets
               Genus Crepidula Lamarck, 1799
                 1 Subgenus Siphopatella Lesson, 1833, orth. inval.