Nemathelminthes Gegenbaur, 1859 see Phylum Nematoda Gegenbaur, 1859
   Class Nematoda Gegenbaur, 1859
     Subclass Penetrantia
       Order Dorylaimida Pearse, 1942
         Suborder Dorylaimina Chitwood, 1933
           67 Family Nygolaimidae Thorne, 1935
           68 Family Dorylaimidae De Man, 1876
           69 Family Chrysonematidae Siddiqi, 1969
           70 Family Thornenematidae Siddiqi, 1969
           71 Family Nordiidae Jairajpuri & Siddiqi, 1964
           72 Family Qudsianematidae Jairajpuri, 1965
           73 Family Aporcelaimidae Heyns, 1965
           74 Family Longidoridae Thorne, 1935
           75 Family Belondiridae Thorne, 1939
           76 Family Actinolaimidae Thorne, 1939
           77 Family Discolaimidae Siddiqi, 1969
           78 Family Leptonchidae Thorne, 1935
           79 Family Campydoridae Thorne, 1935