organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Kingdom Animalia Linnaeus, 1758 - animals
     Eumetazoa Bütschli, 1910 - eumetazoans
       Bilateria Hatschek, 1888 - bilaterians see Subkingdom Bilateria Hatschek, 1888
         Protostomia Grobben, 1908 see Infrakingdom Protostomia Grobben, 1908
           Aschelminthes Grobben, 1910 see [unranked] Protostomia Grobben, 1908
             Cycloneuralia Nielsen, 1995 see [unranked] Introverta Nielsen, 1995
               Introverta Nielsen, 1995
                 Phylum Nematoda Gegenbaur, 1859 - round worms
                   Genus Ascaris Linnaeus, 1758
                   Genus Caenorhabditis Osche, 1952
                   Genus Draconema Cobb, 1913
                   Genus Kinonchulus (F. Riemann, 1972)
                   Genus Panagrellus Thorne, 1938
                   Genus Parascaris Yorke & Maplestone, 1926
                   Genus Pontonema Leidy, 1855