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
                   01 Genus Tetrastemmaᵀ Ehrenberg, 1831
                   02 Genus Prostoma Dugès, 1828
                   03 Genus Amphinemertes Coe, 1940
                   04 Genus Itanemertes Corrêa, 1957
                   05 Genus Prostomiopsis Friedrich, 1936
                   06 Genus Algonemertes Corrêa, 1954
                   07 Genus Austroprostoma Stiasny-Wijnhoff, 1942
                   08 Genus Sacconemertes Karling, 1933
                   09 Genus Sacconemertella Iwata, 1970
                   10 Genus Sacconemertopsis Iwata, 1970
                   11 Genus Arenonemertes Friedrich, 1933
                   12 Genus Nemertellina Friedrich, 1935
                   13 Genus Nemertellopsis Friedrich, 1935
                   14 Genus Africanemertes Stiasny-Wijnhoff, 1942
                   15 Genus Prostomatella Friedrich, 1935