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 Superfamily Sphaerularioidea Lubbock, 1861 Family Neotylenchidae Thorne, 1941 Genus Hadrodenus Mulvey, 1969