Metazoa Haeckel 1874 - multicellular animals see Kingdom Animalia Linnaeus, 1758
   Phylum Nemertea Schultze, 1851 - ribbon worms
     Neonemertea Thollesson & Norenburg, 2003
       Hoplonemertea Hubrecht, 1879 see Order Hoplonemertea Hubrecht, 1879
         Monostilifera see Suborder Monostilifera Brinkmann, 1917
           Distromatonemertea Thollesson & Norenburg, 2003
             Family Tetrastemmatidae Hubrecht, 1879
               1 Genus Nemertellina Friedrich, 1935
               2.1.1 Tetrastemma wilsoni Coe, 1943
               2.1.2 Genus Oerstedia Quatrefages, 1846
               2.2.1 Tetrastemma elegans (Girard, 1852)
               2.2.2 Genus Antarctonemertes Friedrich, 1955