Ichneumonidae Latreille, 1802
Diadegma acronyctae (Ashmead, 1896)
Diadegma aculeatum (Bridgman, 1889)
Diadegma acutum (Viereck, 1925)
Diadegma adelungi (Kokujev, 1915)
Diadegma aegyptiacum Horstmann, 1993
Diadegma aestivale (Viereck, 1921)
Diadegma agens Townes, 1964
Diadegma agile (Brischke, 1880)
Diadegma akoense (Shiraki, 1917)
Diadegma akoensis (Shiraki, 1917)
Diadegma albertae (Walley, 1929)
Diadegma albicalcar (Morley, 1913)
Diadegma albicinctum Walley, 1967
Diadegma albipes Horstmann, 1981
Diadegma albotibiale Horstmann, 1973
Diadegma alpicola (Smits van Burgst, 1914)
Diadegma amphipoeae Kusigemati, 1993
Diadegma angitiaeforma Horstmann, 1969
Diadegma angulator (Aubert, 1963)
Diadegma annulicrus (Thomson, 1887)
Diadegma antennaellae (Walley, 1932)
Diadegma anurum (Thomson, 1887)
Diadegma areolare (Holmgren, 1860)
Diadegma areolator Aubert, 1974
Diadegma argentellae Horstmann, 2004
Diadegma argyloplocevora (Uchida, 1932)
Diadegma armillata (Gravenhorst, 1829)
Diadegma armillatum (Gravenhorst, 1829)
Diadegma auranticolor Aubert, 1979
Diadegma auricellae Horstmann, 2008
Diadegma aztecum (Cameron, 1904)
Diadegma balticum Horstmann, 1969
Diadegma basale Horstmann, 1980
Diadegma blackburni (Cameron, 1883)
Diadegma boreale Horstmann, 1980
Diadegma brevipetiolatum Horstmann, 1969
Diadegma brevivalve (Thomson, 1887)
Diadegma buckelli (Viereck, 1925)
Diadegma californicum Walley, 1967
Diadegma callisto Horstmann, 1993
Diadegma capense (Cameron, 1906)
Diadegma carolina Walley, 1967
Diadegma chrysostictos (Gmelin, 1790)
Diadegma chrysostictum (Gmelin, 1790)
Diadegma cinnabaritor Aubert, 1970
Diadegma claripenne (Thomson, 1887)
Diadegma clavicorne (Brischke, 1880)
Diadegma coleophorarum (Ratzeburg, 1852)
Diadegma colutellae Horstmann, 2008
Diadegma combinatum (Holmgren, 1860)
Diadegma compressum (Cresson, 1864)
Diadegma comptoniellae (Viereck, 1925)
Diadegma consumtor (Gravenhorst, 1829)
Diadegma contractum (Brischke, 1880)
Diadegma crassicorne (Gravenhorst, 1829)
Diadegma crassiseta (Thomson, 1887)
Diadegma crassulum Walley, 1967
Diadegma crassum (Bridgman, 1889)
Diadegma crataegi Horstmann, 1980
Diadegma curvicaudis (Szepligeti, 1916)
Diadegma cylindricum (Brischke, 1880)
Diadegma defectivum (Kokujev, 1915)
Diadegma densepilosellum (Cameron, 1911)
Diadegma dinianator Aubert, 1966
Diadegma discoocellellae (Viereck, 1911)
Diadegma dispar (Gmelin, 1790)
Diadegma dominans (Walker, 1860)
Diadegma duplicatum Horstmann, 1980
Diadegma elegans Dbar, 1984
Diadegma elishae (Bridgman, 1884)
Diadegma elongatum (Thomson, 1887)
Diadegma epinotiae Momoi, 1973
Diadegma erraticum (Brischke, 1880)
Diadegma erucator (Zetterstedt, 1838)
Diadegma erythropoda Kusigemati, 1987
Diadegma erythropus (Hellen, 1949)
Diadegma exareolator Aubert, 1964
Diadegma fabricianae Horstmann & Shaw, 1984
Diadegma falciferum Walley, 1967
Diadegma fenestrale (Holmgren, 1860)
Diadegma filicorne Horstmann, 1980
Diadegma filiformator Aubert, 1971
Diadegma flavoclypeatum Horstmann & Graham, 1989
Diadegma flavotibiale Horstmann, 1973
Diadegma flexa Horstmann, 1973
Diadegma flexum Horstmann, 1973
Diadegma fugitivum (Haliday, 1836)
Diadegma fulvipalpe (Cameron, 1906)
Diadegma fumatum (Hedwig, 1962)
Diadegma fungicola Horstmann, 2008
Diadegma gallicator (Aubert, 1960)
Diadegma gibbulum (Brischke, 1880)
Diadegma glabriculum (Holmgren, 1859)
Diadegma gracile (Gravenhorst, 1829)
Diadegma gracillimum (Smits van Burgst, 1914)
Diadegma grisescens (Gravenhorst, 1829)
Diadegma groenlandicum (Roman, 1916)
Diadegma hiraii Kusigemati, 1993
Diadegma hispanicum Horstmann, 1973
Diadegma hokkaidense Momoi, Kusigemati & Nakanishi, 1968
Diadegma holopygum (Thomson, 1887)
Diadegma hospitum (Holmgren, 1868)
Diadegma hygrobium (Thomson, 1887)
Diadegma imbecillum (Enderlein, 1921)
Diadegma incompletum Horstmann, 1973
Diadegma insectator (Schrank, 1781)
Diadegma insulare (Cresson, 1865)
Diadegma integrator Aubert, 1970
Diadegma ishiyamanum (Uchida, 1928)
Diadegma johanseni (Viereck, 1925)
Diadegma koizumii Momoi, 1973
Diadegma kozlovi (Kokujev, 1915)
Diadegma kyffhusanae Horstmann, 1973
Diadegma kyushuense Momoi, Kusigemati & Nakanishi, 1968
Diadegma lactibiator Aubert, 1964
Diadegma laricinellum (Strobl, 1904)
Diadegma laterale (Gravenhorst, 1829)
Diadegma laticeps (Viereck, 1925)
Diadegma latungula (Thomson, 1887)
Diadegma ledicola Horstmann, 1969
Diadegma leontiniae (Brèthes, 1923)
Diadegma lithocolletis Horstmann, 1969
Diadegma litorale (Holmgren, 1856)
Diadegma longicauda (Cameron, 1904)
Diadegma longicaudatum Horstmann, 1969
Diadegma lugubre (Spinola, 1851)
Diadegma lyonetiae (Viereck, 1925)
Diadegma maculatum (Gravenhorst, 1829)
Diadegma majale (Gravenhorst, 1829)
Diadegma major (Szepligeti, 1916)
Diadegma majus (Szepligeti, 1916)
Diadegma mandschukuonum (Uchida, 1942)
Diadegma maurum (Gravenhorst, 1829)
Diadegma mediterraneum (Constantineanu, 1930)
Diadegma melanium (Thomson, 1887)
Diadegma meliloti Horstmann, 1973
Diadegma meridionator Aubert, 1971
Diadegma micrurum (Thomson, 1887)
Diadegma minutum (Viereck, 1925)
Diadegma mollipla (Holmgren, 1868)
Diadegma monospilum (Thomson, 1887)
Diadegma moraguesi (Kriechbaumer, 1894)
Diadegma muelleri (Butler, 1874)
Diadegma nanus (Gravenhorst, 1829)
Diadegma narcyiae Horstmann, 2008
Diadegma neocerophagum Horstmann, 1969
Diadegma neomajale Horstmann, 1969
Diadegma nepalense Kusigemati, 1987
Diadegma nervosae Horstmann, 1969
Diadegma nigridens Horstmann, 2008
Diadegma nigrifemur (Seyrig, 1927)
Diadegma nigriscapus Horstmann, 1980
Diadegma nigrostigmaticum Horstmann, 1969
Diadegma nigrum (Statz, 1936)
Diadegma novaezealandiae Azidah, Fitton & Quicke, 2000
Diadegma obliteratellum (Viereck, 1925)
Diadegma obscurum (Cresson, 1864)
Diadegma occultum (Brischke, 1880)
Diadegma openangorum (Viereck, 1917)
Diadegma operculellae Horstmann, 1993
Diadegma oranginator Aubert, 1964
Diadegma paenesessile (Viereck, 1925)
Diadegma paludis Horstmann, 1969
Diadegma parviforme (Viereck, 1917)
Diadegma parvum (Provancher, 1874)
Diadegma patruele (Holmgren, 1868)
Diadegma pattoni (Ashmead, 1890)
Diadegma pendulum Walley, 1967
Diadegma pilosum Horstmann, 1980
Diadegma pini Momoi, 1973
Diadegma polonicum Horstmann, 1980
Diadegma psilocorsis Walley, 1967
Diadegma pulchripes (Kokujev, 1915)
Diadegma pulicalvariae Walley, 1967
Diadegma pulicator Aubert, 1974
Diadegma pusio (Holmgren, 1860)
Diadegma pyreneator (Aubert, 1960)
Diadegma rapi (Cameron, 1912)
Diadegma rectificator Aubert, 1970
Diadegma retusa Kusigemati, 1987
Diadegma rufatum (Bridgman, 1884)
Diadegma ruficeps (Holmgren, 1860)
Diadegma rufigaster Horstmann, 1973
Diadegma salicis Horstmann, 1973
Diadegma sanguinicoxa (Brauns, 1895)
Diadegma satanicolor Aubert, 1971
Diadegma scotiae (Bridgman, 1889)
Diadegma semiclausum (Hellen, 1949)
Diadegma simile (Pfankuch, 1914)
Diadegma simplificator Aubert, 1964
Diadegma solum (Viereck, 1925)
Diadegma sordipes (Thomson, 1887)
Diadegma speculare (Thomson, 1887)
Diadegma spurcum (Holmgren, 1868)
Diadegma stagnale (Holmgren, 1856)
Diadegma stenosomum (Viereck, 1925)
Diadegma stigmatellae Horstmann, 1980
Diadegma suecicum Horstmann, 1973
Diadegma tamariscator (Aubert, 1960)
Diadegma tenuipes (Thomson, 1887)
Diadegma trachas (Viereck, 1925)
Diadegma transversale (Szepligeti, 1916)
Diadegma trichopterorum Horstmann, 2004
Diadegma trichoptilus (Cameron, 1909)
Diadegma tripunctatum (Bridgman, 1886)
Diadegma trochanteratum (Thomson, 1887)
Diadegma truncatum (Thomson, 1887)
Diadegma undulator Aubert, 1970
Diadegma ungavae Walley, 1967
Diadegma valesiator Aubert, 1970
Diadegma variegatum (Szepligeti, 1916)
Diadegma velox (Holmgren, 1860)
Diadegma villosulum (Hedwig, 1962)
Diadegma zaydamense (Kokujev, 1915)