Nemathelminthes Gegenbaur, 1859 see Phylum Nematoda Gegenbaur, 1859
   Class Nematoda Gegenbaur, 1859
     Subclass Torquentia
       Order Desmoscolecida Filipjev, 1929 [monotypic]
         1 Suborder Desmoscolecina Chitwood, 1933