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 Pyramidellinae Gray, 1840
               Genus Pyramidella Lamarck, 1799
                 1 Subgenus Callolonchaeus Vaught, 1989, orth. inval. see Subgenus Callolongchaeus Dall & Bartsch, 1904
                 2 Subgenus Longchaeus Mörch, 1875
                 3 Subgenus Milda Dall & Bartsch, 1904
                 4 Subgenus Pharcidella Dall, 1889
                 5 Subgenus Sulcorinella Dall & Bartsch, 1904
                 6 Subgenus Voluspa Dall & Bartsch, 1904