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
         Pseudocoelomata see [unranked] Pseudocoelomates Hyman, 1951
           Phylum Nematomorpha Vejdovsky, 1886 - horsehair worms
             Genus Chordodes Creplin, 1847
             Genus Chordodiolus Heinze, 1935
             Genus Gordionus Müller, 1926
             Genus Gordius Linnaeus, 1758
             Genus Nectonema Verrill, 1879
             Genus Parachordodes Camerano, 1897
             Genus Paragordius Camerano, 1897