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 Nemertea Schultze, 1851 - ribbon worms
           Class Enopla Schultze, 1851
             Order Hoplonemertea Hubrecht, 1879
               Suborder Monostilifera Brinkmann, 1917
                 Family Tetrastemmatidae Hubrecht, 1879
                   Genus Prostoma Dugès, 1828
                     1 Prostoma eilhardi (Montgomery, 1894)
                     2 Prostoma graecense (Böhmig, 1892)
                     3 Prostoma canadiensis Gibson & Moore, 1978
                     4 Prostoma jenningsi Gibson & Young
                     5 Prostoma kolasai Gibson & Moore, 1976
                     6 Prostoma puteale (Dugès, 1828)
                     7 ?Prostoma asensoriatum Montgomery, 1896