living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
         Phylum Mollusca Linnaeus, 1758 - molluscs
           Class Scaphopoda Bronn, 1862 - tusk shells
             Order Gadilida Starobogatov, 1974
               Family Pulsellidae Boss, 1982
                 1 Genus Pulsellum Stoliczka, 1868
                 2 Genus Striopulsellum Boss, 1982, nom. nud. see Genus Striopulsellum Scarabino, 1995
                 3 Genus Annulipulsellum Scarabino, 1986
                 4 Genus Compressidens Pilsbry & Sharp, 1897
                 5 Genus Emersoniella Boss, 1982, nom. nud. see Genus Wemersoniella Scarabino, 1986