FAMILY                      Tetradonematidae Cobb, 1919 [Rubtsov 1977 p.80]
GENUS                              Aproctonema Keilin, 1917:399
SPECIES                                 Aproctonema chapmani Nickle, 1969:52 [host Culiocoides arboricola]
TYPE SPECIES                            Aproctonema entomophagum Keilin, 1917 [ host Sciara pullula]
SPECIES                                 Aproctonema simuliophaga Rubtsov, 1966
GENUS                              Bispiculum Zervos, 1980:156
SPECIES                                 Bispiculum inaequale Zervos, 1980:156 [coleopteran host]
GENUS                              Bissonema Rubtsov, 1978
TYPE SPECIES                            Bissonema acicularis (Rubtsov, 1966)
                                        [=Mermithonema acicularis Rubtsov, 1966]
GENUS                              Brevinema Rubtsov, 1978
TYPE SPECIES                            Brevinema brevis (Rubtsov, 1966)
                                        [=Mermithonema brevis Rubtsov, 1966]
GENUS                              Corethrellonema Nickle, 1969:49
TYPE SPECIES                            Corethrellonema grandispiculosum Nickle, 1969:51 [Louisiana;  host Corethrella brakeleyi]
GENUS                              Crassinema Rubtsov, 1978
TYPE SPECIES                            Crassinema glustschenkovae Rubtsov, 1978
GENUS                              Didilia Tang, Hominick, Killick Kendrick, Killick Kendrick & Page, 1993:326 [Type is D. ooglypta]
SPECIES                                 Didilia ooglypta Tang, Hominick, Killick-Kendrick, Killick-Kendrick & Page, 1993:326 [host Phlebotomus papatasi (Diptera)]
GENUS                              Heterogonema Waerebeke & Remillet, 1971 [host Nitidulidae]
SPECIES                                 Heterogonema ovomasculis Waerebeke & Remillet, 1973
GENUS                              Mermithonema Goodey, 1941:105
TYPE SPECIES                            Mermithonema entomophilum Goodey, 1941 [ host Sepsis cynipsea]
GENUS                              Nematimermis Tchesunov & Spiridonov, 1993:7 [Type is N. enoplivora]
SPECIES                                 Nematimermis enoplivora Tchesunov & Spiridonov, 1993:7 [host Enoplus brevis]
GENUS                              Paraproctonema Rubtsov, 1978
TYPE SPECIES                            Paraproctonema simuliophaga
                                        [=Aproctonema simuliophaga]
GENUS                              Tetradonema Cobb, 1919:176
TYPE SPECIES                            Tetradonema plicans Cobb, 1919 [ Diagnostic; Nickle & Jouvenaz 1987 p.313; host Sciara coprophila]
SPECIES                                 Tetradonema solenopsis Nickle & Jouvenaz, 1987:311 [host Solenopsis invicta (Hymenoptera)]
GENUS                              Trichonema Rubtsov, 1978 [praeocc. Cobbold 1874]
TYPE SPECIES                            Trichonema binucleata Rubtsov, 1978 [ host Culicoides obsoletus]