Phylum Nematoda Gegenbaur, 1859 - round worms
   Class Secernentea Von Linstow, 1905
     Subclass Tylenchia (Thorne, 1949) Inglis, 1983
       Order Tylenchida G. Thorne, 1949
         Suborder Hoplolaimina Chizhov & Berezina, 1988
           Superfamily Hoplolaimoidea (Filipjev, 1934) Paramonov, 1967 see Superfamily Tylenchoidea Örley, 1880
             Family Pratylenchidae Thorne, 1949
               Subfamily Nacobbinae Chitwood, in Chitwood & Chitwood, 1950
                 Genus Nacobbus Thorne & Allen, 1944