Nemathelminthes Gegenbaur, 1859 see Phylum Nematoda Gegenbaur, 1859
   Class Nematoda Gegenbaur, 1859
     Subclass Secernentia (Von Linstow, 1905) Andrássy, 1976
       Order Rhabditida Chitwood, 1933
         Suborder Diplogasterina Paramonov, 1952 see Suborder Diplogastrina Paramonov, 1952
           32 Family Diplogasteridae Micoletzky, 1922 see Family Diplogastridae Micoletzky, 1922
           33 Family Neodiplogasteridae Paramonov, 1952 see Family Neodiplogastridae Paramonov, 1952
           34 Family Diplogasteroididae Filipjev & Schuurmans Stekhoven, 1941
           35 Family Tylopharyngidae Filipjev, 1934
           36 Family Odontopharyngidae Micoletzky, 1922