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 Heteroderidae Filipjev & Schuurmans Stekhoven, 1941
               Subfamily Heteroderinae Filipjev & Schuurmans Stekhoven, 1941
                 Genus Cactodera Krall & Krall, 1978