Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Gastropoda Cuvier, 1795 - snails and slugs
     Subclass Prosobranchia Milne-Edwards, 1848 - prosobranchs see Class Gastropoda Cuvier, 1795
       Superorder Archaeogastropoda Thiele, 1925
         Order Vetigastropoda Salvini-Plawen, 1980 - archaeogastropods s.l.
           Superfamily Fissurelloidea Fleming, 1822 [monotypic]
             Family Fissurellidae Fleming, 1822 - keyhole limpets
               Subfamily Emarginulinae Children, 1834
                 01 Genus Emarginula Lamarck, 1801
                 02 Genus Cranopsis Adams, 1860
                 03 Genus Clypidina Gray, 1847
                 04 Genus Emarginella Pilsbry, 1891
                 05 Genus Entomella Cossmann, 1888
                 06 Genus Fissurisepta Seguenza, 1863
                 07 Genus Hemitoma Swainson, 1840
                 08 Genus Laeviemarginula Habe, 1953
                 09 Genus Nesta Adams, 1870
                 10 Genus Notomella Cotton, 1957
                 11 Genus Puncturella Lowe, 1827
                 12 Genus Rimula Defrance, 1827
                 13 Genus Rimularia Bronn, 1838, nom. illeg. see Genus Rimula Defrance, 1827
                 14 Genus Scutus Montfort, 1810
                 15 Genus Tugali Gray, 1843
                 16 Genus Zeidora Adams, 1860