Ablechroiulus Andrassy, 1966 accepted as Rhabditis Dujardin, 1845 (extant flag source)
Ablechroiulus Andrassy, 1966 accepted as Rhabditis Dujardin, 1845 (basis of record)
Achromadora Cobb, 1913 (basis of record)
Achromadora Cobb, 1913 (extant flag source)
Acrobeles Von Linstow, 1887 (extant flag source)
Acrobeles Von Linstow, 1887 (basis of record)
Acrobeloides Cobb, 1924 (basis of record)
Acrobeloides Cobb, 1924 (extant flag source)
Acrobelophis Andrassy, 1984 (extant flag source)
Acrobelophis Andrassy, 1984 (basis of record)
Acrolobus Bostrom, 1985 (extant flag source)
Acrolobus Bostrom, 1985 (basis of record)
Acrostichus Rahm, 1928 (extant flag source)
Acrostichus Rahm, 1928 (basis of record)
Aetholaimus Williams, 1962 (extant flag source)
Aetholaimus Williams, 1962 (basis of record)
Alaimus de Man, 1880 (basis of record)
Alaimus de Man, 1880 (extant flag source)
Amphidelus Thorne, 1939 (extant flag source)
Amphidelus Thorne, 1939 (basis of record)
Anaplectus Coninck & Stekhoven, 1933 (extant flag source)
Anaplectus Coninck & Stekhoven, 1933 (basis of record)
Anatonchus Cobb, 1916 (extant flag source)
Anatonchus Cobb, 1916 (basis of record)
Anomyctus Allen, 1940 (extant flag source)
Anomyctus Allen, 1940 (basis of record)
Aphanolaimus de Man, 1880 (basis of record)
Aphanolaimus de Man, 1880 (extant flag source)
Aphelenchoides Fischer, 1894 (extant flag source)
Aphelenchoides Fischer, 1894 (basis of record)
Aphelenchus Bastian, 1865 (extant flag source)
Aphelenchus Bastian, 1865 (basis of record)
Aporcelaimellus Heyns, 1965 (extant flag source)
Aporcelaimellus Heyns, 1965 (basis of record)
Aporcelaimium Loof & Coomans, 1970 accepted as Metaporcelaimus Lordello, 1965 (extant flag source)
Aporcelaimium Loof & Coomans, 1970 accepted as Metaporcelaimus Lordello, 1965 (basis of record)
Aporcelaimus Thorne & Swanger, 1936 (basis of record)
Aporcelaimus Thorne & Swanger, 1936 (extant flag source)
Aprutides Scognamiglio, Talamé & s'Jacob, 1970 (extant flag source)
Aprutides Scognamiglio, Talamé & s'Jacob, 1970 (basis of record)
Aulolaimus de Man, 1880 (basis of record)
Aulolaimus de Man, 1880 (extant flag source)
Axonchium Cobb, 1920 (basis of record)
Axonchium Cobb, 1920 (extant flag source)
Bastiania de Man, 1876 (extant flag source)
Bastiania de Man, 1876 (basis of record)
Bathyodontus Fielding, 1950 (basis of record)
Bathyodontus Fielding, 1950 (extant flag source)
Bunonema Jägerskiöld, 1905 (basis of record)
Bunonema Jägerskiöld, 1905 (extant flag source)
Bursaphelenchus Fuchs, 1937 (basis of record)
Bursaphelenchus Fuchs, 1937 (extant flag source)
Bursilla Andrassy, 1976 (basis of record)
Bursilla Andrassy, 1976 (extant flag source)
Butlerius Goodey, 1929 (basis of record)
Butlerius Goodey, 1929 (extant flag source)
Campydora Cobb, 1920 (extant flag source)
Campydora Cobb, 1920 (basis of record)
Carcharolaimus Thorne, 1939 (basis of record)
Carcharolaimus Thorne, 1939 (extant flag source)
Cephalobus Bastian, 1865 (basis of record)
Cephalobus Bastian, 1865 (extant flag source)
Ceratoplectus Andrássy, 1984 accepted as Plectus Bastian, 1865 (extant flag source)
Ceratoplectus Andrássy, 1984 accepted as Plectus Bastian, 1865 (basis of record)
Cervidellus Thorne, 1937 (extant flag source)
Cervidellus Thorne, 1937 (basis of record)
Chiloplacus Thorne, 1937 (basis of record)
Chiloplacus Thorne, 1937 (extant flag source)
Choanolaimus de Man, 1880 (basis of record)
Choanolaimus de Man, 1880 (extant flag source)
Chromadorina Filipjev, 1918 (extant flag source)
Chromadorina Filipjev, 1918 (basis of record)
Chromadorita Filipjev, 1918 (extant flag source)
Chromadorita Filipjev, 1918 (basis of record)
Chrysonemoides Siddiqi, 1969 accepted as Chrysonema Thorne, 1929 (basis of record)
Chrysonemoides Siddiqi, 1969 accepted as Chrysonema Thorne, 1929 (extant flag source)
Coarctadera Dougherty, 1953 (extant flag source)
Coarctadera Dougherty, 1953 (basis of record)
Craspedonema Richters, 1908 (extant flag source)
Craspedonema Richters, 1908 (basis of record)
Criconemella De Grisse & Loof, 1965 (basis of record)
Criconemella De Grisse & Loof, 1965 (extant flag source)
Cruznema Artigas, 1927 (extant flag source)
Cruznema Artigas, 1927 (basis of record)
Cryptonchus Cobb, 1913 (extant flag source)
Cryptonchus Cobb, 1913 (basis of record)
Curviditis Dougherty, 1953 (basis of record)
Curviditis Dougherty, 1953 (extant flag source)
Cuticularia Van der Linde, 1938 (basis of record)
Cuticularia Van der Linde, 1938 (extant flag source)
Cylindrolaimus de Man, 1880 (extant flag source)
Cylindrolaimus de Man, 1880 (basis of record)
Daptonema Cobb, 1920 (basis of record)
Daptonema Cobb, 1920 (extant flag source)
Demaniella Steiner, 1914 (extant flag source)
Demaniella Steiner, 1914 (basis of record)
Deontolaimus de Man, 1880 (basis of record)
Deontolaimus de Man, 1880 (extant flag source)
Desmolaimus de Man, 1880 (basis of record)
Desmolaimus de Man, 1880 (extant flag source)