Phylum Nematoda Gegenbaur, 1859 - round worms Class Secernentea Von Linstow, 1905 Subclass Tylenchia (Thorne, 1949) Inglis, 1983 Order Tylenchida G. Thorne, 1949 Suborder Criconematina Siddiqi, 1980 Superfamily Criconematoidea Taylor, 1936 (1914) 1 Family Criconematidae Taylor, 1936 (1914)