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 Prostomatella Friedrich, 1935
                     1 Prostomatella arenicola Friedrich, 1935
                     2 Prostomatella enteroplecta
                     3 Prostomatella merula (Corrêa, 1954)
                     4 Prostomatella obscura (Schultze)
                     5 Prostomatella vermicula