Phylum Nematoda Gegenbaur, 1859 - round worms
   Class Secernentea Von Linstow, 1905
     Subclass Tylenchia (Thorne, 1949) Inglis, 1983
       Order Tylenchida G. Thorne, 1949
         1 Suborder Tylenchinaᵀ Chitwood, 1950
         2 Suborder Hoplolaimina Chizhov & Berezina, 1988
         3 Suborder Criconematina Siddiqi, 1980
         4 Suborder Hexatylina Siddiqi, 1980