Nemathelminthes Gegenbaur, 1859 see Phylum Nematoda Gegenbaur, 1859 Class Nematoda Gegenbaur, 1859 Subclass Torquentia Order Chromadorida Chitwood, 1933 Suborder Chromadorina Filipjev, 1929 Family Hypodontolaimidae de Coninck, 1965