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
               Genus Nemertellina Friedrich, 1935
                 Nemertellina yamaokai (Iwata, 1954)