Phylum Nematoda Gegenbaur, 1859 - round worms
   Class Secernentea Von Linstow, 1905
     Subclass Tylenchia (Thorne, 1949) Inglis, 1983
       Order Tylenchida G. Thorne, 1949
         Suborder Tylenchinaᵀ Chitwood, 1950
           Infraorder Tylenchataᵀ (Thorne, 1949) M.R. Siddiqi, 2000
             Superfamily Tylenchoideaᵀ Örley, 1880
               Family Tylenchidae Örley, 1880
                 Subfamily Thadinae Siddiqi, 1986
                   1 Genus Thada Thorne, 1941
                   2 Genus Neothada Khan, 1973