Nemathelminthes Gegenbaur, 1859 see Phylum Nematoda Gegenbaur, 1859
   Class Nematoda Gegenbaur, 1859
     Subclass Secernentia (Von Linstow, 1905) Andrássy, 1976
       Order Tylenchida G. Thorne, 1949
         Suborder Tylenchina Chitwood, 1950
           Family Hoplolaimidae Filipjev, 1934
             Genus Helicotylenchus Steiner, 1945
             Genus Pararotylenchus Baldwin & Bell, 1981 see Subgenus Pararotylenchus (Baldwin & Bell, 1981) M.R. Siddiqi, 2000
             Genus Peltamigratus Sher, 1964
             Genus Rotylenchus Filipjev, 1936