organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Kingdom Animalia Linnaeus, 1758 - animals
     Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
       Bilateria Hatschek, 1888 see Subkingdom Bilateria Hatschek, 1888
         Acoelomata see [unranked] Acoelomates Hyman, 1951
           1 Phylum Mesozoa van Beneden, 1876 see [unranked] Mesozoa van Beneden, 1876
           2 Phylum Platyhelminthes Gegenbaur, 1859 - flatworms
           3 Phylum Nemertina Oersted, 1844 see Phylum Nemertini
           4 Phylum Gnathostomulida Ax, 1956 - gnathostomulids