Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Gastropoda Cuvier, 1795 - snails and slugs
     Subclass Heterobranchia Burmeister, 1837 [monotypic] see Superorder Heterobranchia Burmeister, 1837
       Order Heterostropha Fischer, 1885
         Superfamily Pyramidelloidea Gray, 1840
           Family Pyramidellidae Gray, 1840
             Subfamily Odostomiinae Casey, 1904
               Genus Chrysallida Carpenter, 1856
                 1 Subgenus Babella Dall & Bartsch, 1906
                 2 Subgenus Haldra Dall & Bartsch, 1904
                 3 Subgenus Mumiola A. Adams, 1863
                 4 Subgenus Odontostomiella Cossmann & Peyrot, 1918, nom. illeg. see Genus Odostomella Bucquoy, Dautzenberg & Dollfus, 1883
                 5 Subgenus Prestoniella Saurin, 1958
                 6 Subgenus Pyrgulina Adams, 1863 see Genus Pyrgulina Adams, 1863
                 7 Subgenus Standeniella Saurin, 1958
                 8 Subgenus Trabecula Monterosato, 1884
                 9 Subgenus Vilia Dall & Bartsch, 1904