Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Mollusca Linnaeus, 1758 - molluscs
     Subphylum Diasoma Runnegar & Pojeta Jr., 1974 see Phylum Mollusca Linnaeus, 1758
       Class Scaphopoda Bronn, 1862 - tusk shells
         Order Dentalioida Palmer, 1974 see Order Dentaliida Starobogatov, 1974
           Genus Bathoxifus see Genus Bathoxiphus Pilsbry & Sharp, 1897
           Genus Compressidens Pilsbry & Sharp, 1897
           Genus Dentalium Linnaeus, 1758
           Genus Fissidentalium Fischer, 1885
           Genus Fustiaria Stoliczka, 1868
           Genus Graptacme Pilsbry & Sharp, 1897
           Genus Laevidentalium Cossmann, 1888
           Genus Lobantale Cossmann, 1888
           Genus Paradentalium Cotton & Godfrey, 1933
           Genus Plagioglypta Pilsbry, 1898
           Genus †Prodentalium Young, 1942
           Genus Progadilina Palmer, 1974
           Genus †Rhytiodentalium Pojeta & Runnegar, 1979
           Genus Spadentalina Habe, 1963
           Genus Tesseracme Pilsbry & Sharp, 1898