living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
         Phylum Nemata Cobb, 1919 see Phylum Nematoda Gegenbaur, 1859
           Class Secernentea Von Linstow, 1905
             Subclass Diplogasteria see Subclass Plectia Hodda, 2007
               Order Tylenchida G. Thorne, 1949
                 Suborder Tylenchina Chitwood, 1950
                   Superfamily Criconematoidea Taylor, 1936 (1914)
                     Family Tylenchulidae Skarbilovich, 1947
                       1 Genus Tylenchocriconema Raski & Siddiqi, 1975
                       2 Genus Trophonema Raski, 1957 see Genus Trophotylenchulus Raski, 1957
                       3 Genus Tylenchulus Cobb, 1913
                       4 Genus Sphaeronema Raski & Sher, 1952
                       5 Genus Meloidoderita Poghossian, 1966