Nemathelminthes Gegenbaur, 1859 see Phylum Nematoda Gegenbaur, 1859 Class Nematoda Gegenbaur, 1859 Subclass Secernentia (Von Linstow, 1905) Andrássy, 1976 Order Rhabditida Chitwood, 1933 Suborder Rhabditina Chitwood, 1933 Family Diploscapteridae Chitwood & Chitwood, 1937