Phylum Nematoda Gegenbaur, 1859 - round worms
   Class Secernentea Von Linstow, 1905
     Subclass Tylenchia (Thorne, 1949) Inglis, 1983
       Order Tylenchida G. Thorne, 1949
         Suborder Hexatylina Siddiqi, 1980
           1 Superfamily Sphaerularioidea Lubbock, 1861
           2 Superfamily Iotonchioidea (Goodey, 1953) Siddiqi, 1986 see Superfamily Sphaerularioidea Lubbock, 1861
           3 Genus Anguillonema Fuchs, 1938, nom. dub.
           4 Genus Helionema Brzeski, 1962, nom. dub.
           5 Genus Robleus Massey, 1974, nom. dub.