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
               1 Subfamily Neotylenchinae Thorne, 1941
               2 Subfamily Gymnotylenchinae Siddiqi, 1980
               3 Subfamily Fergusobiinae Goodey, 1963
               4 Subfamily Rubzovinematinae Slobodyanyuk, 1999
               5 Genus Hadrodenus Mulvey, 1969