| Subgenus | Opius (Adontopius) Fischer, 1984
| 10 | Species |
| Subgenus | Opius (Agnopius) Fischer, 1982
| 24 | Species |
| Subgenus | Opius (Allophlebus) Fischer, 1972
| 31 | Species |
| Subgenus | Opius (Allotypus) Förster, 1862
| 38 | Species |
| Subgenus | Opius (Apodesmia) Forster, 1862
| 46 | Species |
| Subgenus | Opius (Aulonotus) Ashmead, 1900
| 0 | Species |
| Subgenus | Opius (Baeocentrum) Schulz, 1911
| 40 | Species |
| Subgenus | Opius (Bellopius) Wharton, 1997
| 11 | Species |
| Subgenus | Opius (Bracanastrepha) Brèthes, 1924
| 14 | Species |
| Subgenus | Opius (Buckanastrepha) Fischer, 1977 ⇒ Bracanastrepha
| 17 | Species |
| Subgenus | Opius (Cephaloplites) Szépligeti, 1897
| 2 | Species |
| Subgenus | Opius (Chilosema) Fischer, 1972
| 1 | Species |
| Subgenus | Opius (Cryptognathopius) Fischer, 1984
| 4 | Species |
| Subgenus | Opius (Cryptonastes) Förster, 1862
| 28 | Species |
| Subgenus | Opius (Eutrichopsis) Forster, 1862
| 1 | Species |
| Subgenus | Opius (Gastrosema) Fischer, 1972
| 112 | Species |
| Subgenus | Opius (Gerius) Fischer, 1972
| 8 | Species |
| Subgenus | Opius (Grimnirus) Fischer, 1972
| 16 | Species |
| Subgenus | Opius (Hoenirus) Fischer, 1972
| 11 | Species |
| Subgenus | Opius (Holcosema) Fischer, 1972
| 1 | Species |
| Subgenus | Opius (Hypocynodus) Förster, 1862
| 27 | Species |
| Subgenus | Opius (Ilicopius) Fischer, 1992
| 6 | Species |
| Subgenus | Opius (Kainopaeopius) Fischer, 1987
| 4 | Species |
| Subgenus | Opius (Lissosema)
| 0 | Species |
| Subgenus | Opius (Merotrachys) Fischer, 1972
| 59 | Species |
| Subgenus | Opius (Millenniopius) Fischer, 1996
| 1 | Species |
| Subgenus | Opius (Mimiropius) Fischer, 1987
| 8 | Species |
| Subgenus | Opius (Misophthora) Förster, 1862
| 34 | Species |
| Subgenus | Opius (Nosopaeopius) Fischer, 1972
| 32 | Species |
| Subgenus | Opius (Nosopoea) Förster, 1862
| 57 | Species |
| Subgenus | Opius (Odontopoea) Fischer, 1987
| 12 | Species |
| Subgenus | Opius (Opiognathus) Fischer, 1972
| 30 | Species |
| Subgenus | Opius (Opiostomus) Fischer, 1972
| 31 | Species |
| Subgenus | Opius (Opiothorax) Fischer, 1972
| 52 | Species |
| Subgenus | Opius (Opithorax)
| 0 | Species |
| Subgenus | Opius (Opius) Wesmael, 1835
| 0 | Species |
| Subgenus | Opius (Pendopius) Fischer, 1972
| 33 | Species |
| Subgenus | Opius (Phaedrotoma) Förster, 1862
| 1 | Species |
| Subgenus | Opius (Phlebosema)
| 0 | Species |
| Subgenus | Opius (Pleurosema) Fischer, 1972
| 40 | Species |
| Subgenus | Opius (Psyttalia) Walker, 1860
| 0 | Species |
| Subgenus | Opius (Rhogadopsis) Brèthes, 1913
| 67 | Species |
| Subgenus | Opius (Snoflakopius) Fischer, 1972
| 2 | Species |
| Subgenus | Opius (Stomosema) Fischer, 1972
| 36 | Species |
| Subgenus | Opius (Thiemanastrepha) Fischer, 1977 ⇒ Bracanastrepha
| 18 | Species |
| Subgenus | Opius (Thoracosema) Fischer, 1972
| 32 | Species |
| Subgenus | Opius (Tolbia) Cameron, 1907
| 40 | Species |
| Subgenus | Opius (Utetes) Foerster, 1862
| 0 | Species |
| Subgenus | Opius (Xynobius) Förster, 1862
| 0 | Species |
| Species | Opius abnormis Wesmael, 1835
| | |
| Species | Opius abscissus Thomson, 1895 ⇒ Opius lugens
| | |
| Species | Opius aciculatus Thomson, 1895
| | |
| Species | Opius aciurae Fischer, 1964
| | |
| Species | Opius adaequator Fischer, 1964
| | |
| Species | Opius addendus Fischer, 1959 ⇒ Opius (Nosopoea) maculipes
| | |
| Species | Opius additivus Fischer, 1965
| | |
| Species | Opius adveniens Fischer, 1960 ⇒ Opius lugens
| | |
| Species | Opius aemula Haliday, 1837
| | |
| Species | Opius aemuloides Fischer, 1958
| | |
| Species | Opius affinis Spinola, 1851
| | |
| Species | Opius africanus Szépligeti, 1908
| | |
| Species | Opius agreutretoides Fischer, 1988
| | |
| Species | Opius agromyzae Viereck, 1912 ⇒ Opius (Rhogadopsis) dimidiatus
| | |
| Species | Opius agromyzicola Fischer, 1967
| | |
| Species | Opius albiapex Fischer, 1965
| | |
| Species | Opius albicoxis Marshall, 1898 ⇒ Opius (Allotypus) geniculatus
| | |
| Species | Opius alconanus Fischer, 1964
| | |
| Species | Opius aldrichi Muesebeck, 1958
| | |
| Species | Opius alloeus
| | |
| Species | Opius altimontanus Fischer, 1969 ⇒ Opius (Agnopius) similis
| | |
| Species | Opius ambirius Goureau, 1851
| | |
| Species | Opius ambivius Goureau, 1851
| | |
| Species | Opius amensis Fischer, 1964 ⇒ Opius nigrocastaneus
| | |
| Species | Opius americanus Gahan, 1915 Robust Schreber's dicranella moss | | |
| Species | Opius ampla Ashmead, 1890
| | |
| Species | Opius analis Wesmael, 1835
| | |
| Species | Opius anaximandri Fischer, 1970
| | |
| Species | Opius anaximensis Fischer, 1970
| | |
| Species | Opius andigenis
| | |
| Species | Opius angaleti
| | |
| Species | Opius anthomyiae
| | |
| Species | Opius apiculator Nees, 1834 ⇒ Opius (Opiothorax) levis
| | |
| Species | Opius aquaticus Muesebeck, 1933 ⇒ Opius (Tolbia) caesus Pygmypipes, Sweet pinesap | | |
| Species | Opius arenarius Stelfox, 1959
| | |
| Species | Opius arenosus Szépligeti, 1898 ⇒ Opius (Allophlebus) singularis
| | |
| Species | Opius areolaris Thomson, 1895 ⇒ Opius (Apodesmia) ocellatus
| | |
| Species | Opius areolatus Szépligeti, 1902
| | |
| Species | Opius argentina Brèthes, 1924 ⇒ Opius (Bracanastrepha) anastrephae
| | |
| Species | Opius argillaceus Tobias, 1998
| | |
| Species | Opius arisanus Sonan, 1932
| | |
| Species | Opius atrocoxalis Ashmead, 1890
| | |
| Species | Opius augustianus Fischer, 1966 ⇒ Opius (Baeocentrum) interstitialis
| | |
| Species | Opius auripennis
| | |
| Species | Opius australicola Fischer, 1966
| | |
| Species | Opius australis Fischer, 1966
| | |
| Species | Opius baderae Wharton, 2013
| | |
| Species | Opius baeblus Wharton, 2013
| | |
| Species | Opius baezodedicata Fischer, 2001
| | |
| Species | Opius baezodedicatus Fischer, 2001 ⇒ Phaedrotoma baezodedicata
| | |
| Species | Opius bajulus Haliday, 1837
| | |
| Species | Opius balthasarius Fischer, 1978
| | |
| Species | Opius basinger Viereck, 1905 Twining screwstem | | |
| Species | Opius basiniger Viereck, 1905
| | |
| Species | Opius basirufus Fischer, 1958 ⇒ Opius (Agnopius) similis
| | |
| Species | Opius beckeri Fischer, 1957
| | |
| Species | Opius bellopius
| | |
| Species | Opius benignus Papp, 1981
| | |
| Species | Opius berberidis Fischer, 1964 ⇒ Opius (Nosopaeopius) downesi
| | |
| Species | Opius betae Bengtsson, 1926
| | |
| Species | Opius bianchii
| | |
| Species | Opius bibentis
| | |
| Species | Opius bicolor Szépligeti, 1898 ⇒ Opius (Cryptonastes) bicoloriformis
| | |
| Species | Opius bifossatus Fischer, 1965
| | |
| Species | Opius bigdeltanus Fischer, 1965
| | |
| Species | Opius bipustulatus Fischer, 1958 ⇒ Opius (Allotypus) irregularis
| | |
| Species | Opius biroi Fischer, 1960
| | |
| Species | Opius blanda Haliday, 1837
| | |
| Species | Opius blantoni Fischer, 1964
| | |
| Species | Opius bremeri Bengtsson, 1926
| | |
| Species | Opius brethesi De Santis, 1967 ⇒ Opius (Rhogadopsis) tucumanus
| | |
| Species | Opius brevicaudis Szépligeti, 1905
| | |
| Species | Opius brevipalpis Thomson, 1895
| | |
| Species | Opius breviscapus Thomson, 1895 ⇒ Opius orbiculator
| | |
| Species | Opius brevisulcus Thomson, 1895
| | |
| Species | Opius britannicola Fischer, 2006
| | |
| Species | Opius brunneitarsis Gahan, 1915 Robust Schreber's dicranella moss | | |
| Species | Opius brutus Papp, 1978 ⇒ Opius (Apodesmia) ocellatus
| | |
| Species | Opius cablus Wharton, 2013
| | |
| Species | Opius caelatus Haliday, 1837
| | |
| Species | Opius caffer Wesmael, 1835
| | |
| Species | Opius calatheae Fischer, 1966
| | |
| Species | Opius californicus
| | |
| Species | Opius canadensis
| | |
| Species | Opius canaliculatus Gaham, 1915
| | |
| Species | Opius capsicola
| | |
| Species | Opius caricivorae Fischer, 1964
| | |
| Species | Opius carinata Thomson, 1895
| | |
| Species | Opius carinatus Thomson, 1895
| | |
| Species | Opius carpocapsae Ashmead, 1900
| | |
| Species | Opius castaneus Granger, 1949
| | |
| Species | Opius caudatulus Thomson, 1895
| | |
| Species | Opius caudatus Szépligeti, 1898
| | |
| Species | Opius caudifer Fischer, 1958 ⇒ Opius (Opiothorax) longicornis
| | |
| Species | Opius cellulosus Fischer, 1965 ⇒ Opius (Baeocentrum) punctipes
| | |
| Species | Opius cephalotes Wesmael, 1835
| | |
| Species | Opius cereus Gahan, 1919
| | |
| Species | Opius chapmanni Fischer, 1964
| | |
| Species | Opius cheni van Achterberg & Li, 0
| | |
| Species | Opius chimus Fischer, 1983
| | |
| Species | Opius choristigma Spinola, 1851
| | |
| Species | Opius christenseni Papp, 1982
| | |
| Species | Opius christophori Fischer, 1978
| | |
| Species | Opius ciliatus Nees, 1811
| | |
| Species | Opius cincticornis Gahan, 1915 Robust Schreber's dicranella moss | | |
| Species | Opius cinctiventris Fischer, 1959
| | |
| Species | Opius cinereifactus Fischer, 1964 ⇒ Opius (Thoracosema) farmingdalicus
| | |
| Species | Opius circinus Papp, 1979
| | |
| Species | Opius ciruculator Nees, 1834
| | |
| Species | Opius cisromensis Papp, 1982
| | |
| Species | Opius citlus Fischer, 1983
| | |
| Species | Opius clarus Haliday, 1837 ⇒ Opius (Allophlebus) singularis
| | |
| Species | Opius clavifemoralis Jakimavicius, 1986
| | |
| Species | Opius clypeata Jakimavicius, 1979
| | |
| Species | Opius coillum Chen & Weng, 2005
| | |
| Species | Opius coloradensis Gahan, 1915 Robust Schreber's dicranella moss | | |
| Species | Opius columbicus Fischer, 1963
| | |
| Species | Opius comatus Wesmael, 1835 Cooper wolfberry, Cooper's wolfberry, Peach thorn | | |
| Species | Opius commodus Gahan, 1915
| | |
| Species | Opius complicans Fischer, 1965
| | |
| Species | Opius compressiventris Fischer, 1964
| | |
| Species | Opius concepcionensis Fischer, 1978
| | |
| Species | Opius concolor Szépligeti, 1910
| | |
| Species | Opius confusus Giraud, 1877
| | |
| Species | Opius consors Fischer, 1957 ⇒ Opius (Cryptonastes) tersus
| | |
| Species | Opius contrarius Fischer, 1963
| | |
| Species | Opius contrut Fischer, 1996
| | |
| Species | Opius coracinus Thomson, 1895
| | |
| Species | Opius coriacitergum Fischer, 2014
| | |
| Species | Opius crabtreeanus Fischer, 1964 ⇒ Opius (Rhogadopsis) aberrans
| | |
| Species | Opius crenuliferus Li, van Achterbergan Achterberg & Tan, 2013
| | |
| Species | Opius csikii Fischer, 1957 ⇒ Opius (Cryptonastes) gracilis
| | |
| Species | Opius cubitalis Fischer, 1959
| | |
| Species | Opius cupidus
| | |
| Species | Opius curticornis Fischer, 1960
| | |
| Species | Opius curtifemur Fischer, 1961
| | |
| Species | Opius curtipectus Fischer, 1958
| | |
| Species | Opius curtisignum Fischer, 1968
| | |
| Species | Opius curviscutum Fischer, 1988
| | |
| Species | Opius cyclogaster Thomson, 1895
| | |
| Species | Opius cynipsidum Giraud, 1877
| | |
| Species | Opius dablus Wharton, 2013
| | |
| Species | Opius dacicida Silvestri, 1911
| | |
| Species | Opius dacusii Cameron, 1906
| | |
| Species | Opius daghoides Zaykov & Fischer, 1983
| | |
| Species | Opius dakarensis Fischer, 2005
| | |
| Species | Opius danielsae Wharton, 2013
| | |
| Species | Opius decorata Stelfox, 1949
| | |
| Species | Opius deeralensis Fullaway, 1950 ⇒ Fopius deeralensis
| | |
| Species | Opius dentifer Thomson, 1895
| | |
| Species | Opius depeculator
| | |
| Species | Opius dexter Silvestri, 1914
| | |
| Species | Opius diabolica Fischer, 1961
| | |
| Species | Opius diachasmoides Tobias, 1986
| | |
| Species | Opius differentiarius Fischer, 1965
| | |
| Species | Opius dilatatus Fischer, 1960 ⇒ Opius pygmaeator
| | |
| Species | Opius dimensis Fischer, 1964
| | |
| Species | Opius discolor Papp, 1978 ⇒ Opius (Cryptonastes) bicoloriformis
| | |
| Species | Opius dissitus Muesebeck, 1963 Parasitoid wasp | | |
| Species | Opius distractus
| | |
| Species | Opius diversa Szépligeti, 1898
| | |
| Species | Opius diversiformis Fischer, 1960
| | |
| Species | Opius efoveolatus Szépligeti, 1913
| | |
| Species | Opius ehrhorni Gahan, 1915 Robust Schreber's dicranella moss | | |
| Species | Opius empedoplis Fischer, 1970
| | |
| Species | Opius erythroicus Fischer, 1978
| | |
| Species | Opius eversus Papp, 1981 ⇒ Opius (Nosopoea) circulator
| | |
| Species | Opius exareolatus Viereck, 1917 ⇒ Opius (Stomosema) apicalis
| | |
| Species | Opius exigua Wesmael, 1835
| | |
| Species | Opius exiguus Wesmael, 1835
| | |
| Species | Opius exilis Haliday, 1837
| | |
| Species | Opius extiratus Fischer, 1964 ⇒ Opius (Thoracosema) tibialis
| | |
| Species | Opius extraordinarius Fischer, 1965 ⇒ Opius americanus
| | |
| Species | Opius extusus Papp, 1981
| | |
| Species | Opius fallax Szépligeti, 1896 ⇒ Opius (Misophthora) instabilis
| | |
| Species | Opius farmingdalensis Fischer, 1964 ⇒ Opius (Thoracosema) farmingdalicus
| | |
| Species | Opius fasciatus Thomson, 1895
| | |
| Species | Opius ferrugator Goureau, 1862
| | |
| Species | Opius ferugineus
| | |
| Species | Opius fijiensis Fullaway, 1936 ⇒ Psyttalia (Austroopius) fijiensis
| | |
| Species | Opius flavitarsis Szépligeti, 1913 ⇒ Opius (Nosopaeopius) terebrator
| | |
| Species | Opius flavus Weng & Chen, 2005
| | |
| Species | Opius fletcheri Silvestri, 1916
| | |
| Species | Opius flexicarina Fischer, 1975
| | |
| Species | Opius foersteri Gahan, 1915 ⇒ Opius basiniger
| | |
| Species | Opius formosanus Watanabe, 1934 Wasp | | |
| Species | Opius forticornis Cameron, 1905
| | |
| Species | Opius foveola Fischer, 1957 ⇒ Opius (Odontopoea) connivens
| | |
| Species | Opius frequens Fischer, 1964
| | |
| Species | Opius froggatti Fullaway, 1950
| | |
| Species | Opius fukuensis
| | |
| Species | Opius fulgidum Haliday, 1837
| | |
| Species | Opius fulvicollis Thomson, 1895 Bull filaree, Texas filaree, Texas fillarie | | |
| Species | Opius fulvifacies Fischer, 1966
| | |
| Species | Opius funebris Wesmael, 1835 ⇒ Opius pygmaeator
| | |
| Species | Opius gabriellae Wharton, 2013
| | |
| Species | Opius gafsaensis Fischer, 1964
| | |
| Species | Opius gahanoides
| | |
| Species | Opius gigapiceus Fischer, 1989
| | |
| Species | Opius glasgowi Fischer, 1964
| | |
| Species | Opius godfrayi Wharton, 2013
| | |
| Species | Opius gomesi Costa Lima, 1938 ⇒ Opius (Bellopius) bellus
| | |
| Species | Opius gracielae De Santis, 1982
| | |
| Species | Opius gracilariae Ashmead, 1890 ⇒ Opius (Gastrosema) striativentris
| | |
| Species | Opius gracilior Brues, 1933
| | |
| Species | Opius gracillariae Gahan, 1915 ⇒ Opius (Gastrosema) striativentris Robust Schreber's dicranella moss | | |
| Species | Opius graculis Fischer, 1988 ⇒ Ademoneuron graculis
| | |
| Species | Opius graeffei Fischer, 1959
| | |
| Species | Opius grafi Fischer, 1964 ⇒ Opius (Tolbia) globigaster
| | |
| Species | Opius granulosus Jakimavicius, 1986
| | |
| Species | Opius gravicornis Fischer, 1964
| | |
| Species | Opius gregnar Wharton, 1987
| | |
| Species | Opius griseiscutum Fischer, 1978
| | |
| Species | Opius haemorrhoeus Haliday, 1837
| | |
| Species | Opius haeselbarthi Fischer, 1972
| | |
| Species | Opius hageni
| | |
| Species | Opius hagermanicus Fischer, 1964 ⇒ Opius (Misophthora) hollisterensis
| | |
| Species | Opius hazratbalensis Ahmed, Samiuddin, Mir & Shamim, 2020
| | |
| Species | Opius hians
| | |
| Species | Opius hispanicum Fischer, 1959
| | |
| Species | Opius holconotus Fischer, 1958
| | |
| Species | Opius humilifactus Fischer, 1965
| | |
| Species | Opius humilis Silvestri, 1913 ⇒ Psyttalia humilis
| | |
| Species | Opius hungaricus Szépligeti, 1896 ⇒ Opius (Apodesmia) ocellatus
| | |
| Species | Opius hyalinus Provancher, 1888 ⇒ Opius (Opiognathus) cinctus
| | |
| Species | Opius hydrelliae Rimsky-Korsakov, 1925 ⇒ Opius (Tolbia) caesus
| | |
| Species | Opius hydrellianus Fischer, 1971 ⇒ Opius (Tolbia) caesus
| | |
| Species | Opius ignifer Fischer, 1964
| | |
| Species | Opius iguacuenisis
| | |
| Species | Opius ilicis Nixon, 1939 ⇒ Opius (Ilicopius) pulchriceps Wright's stonecrop | | |
| Species | Opius impatientis Fischer, 1957
| | |
| Species | Opius impressiformis Fischer, 1964
| | |
| Species | Opius incertus
| | |
| Species | Opius incisi Silvestri, 1916
| | |
| Species | Opius inconsuetus Silvestri, 1914
| | |
| Species | Opius indentatus Wharton, 1987
| | |
| Species | Opius infumatus Niezabitowski, 1910
| | |
| Species | Opius ingens Fischer, 1965 ⇒ Opius brunneitarsis
| | |
| Species | Opius inopinatus Papp, 1982
| | |
| Species | Opius inquirendus Silvestri, 1913
| | |
| Species | Opius insularis Hedqvist, 1965 ⇒ Opius (Allotypus) insulicola
| | |
| Species | Opius integer Thomson, 1895
| | |
| Species | Opius intermmissus Fischer, 1964
| | |
| Species | Opius juglandis
| | |
| Species | Opius juniperi Fischer, 1964
| | |
| Species | Opius kangarooensis Fischer, 1988
| | |
| Species | Opius karlmayi Fischer, 2014
| | |
| Species | Opius kostolnaensis Fischer, 1984
| | |
| Species | Opius kraussi Fullaway, 1951 ⇒ Diachasmimorpha kraussi
| | |
| Species | Opius labradorensis Fischer, 1965
| | |
| Species | Opius lacajensis Fischer, 1962
| | |
| Species | Opius lareunionensis Fischer, 2014
| | |
| Species | Opius laticrenis Fischer, 2014
| | |
| Species | Opius latipes Fischer, 1958 ⇒ Opius (Pendopius) pendulus
| | |
| Species | Opius leclyta Fischer, 1996
| | |
| Species | Opius lectoides Gahan, 1930
| | |
| Species | Opius lectus Gahan, 1919
| | |
| Species | Opius lemnaphilae Muesebeck, 1939 Florida pygmy pipes, Reynolds' pygmy pipes | | |
| Species | Opius leptostigma Wesmael, 1835
| | |
| Species | Opius leucosema Fischer, 1978
| | |
| Species | Opius lindbergi Fischer, 1963 ⇒ Psyttalia lindbergiana
| | |
| Species | Opius liopleuris Thomson, 1895
| | |
| Species | Opius lividipes Fischer, 1964
| | |
| Species | Opius loksai Papp, 1985
| | |
| Species | Opius longicauda Thomson, 1895
| | |
| Species | Opius longicaudatus Ashmead, 0 Longtailed fruit fly parasite | | |
| Species | Opius longipes Fischer, 1957 ⇒ Opius (Nosopoea) ambiguus
| | |
| Species | Opius longiradialis
| | |
| Species | Opius longisignum Fischer, 1968
| | |
| Species | Opius longistigmus Goureau, 1865
| | |
| Species | Opius lounsburyi Silvestri, 1914
| | |
| Species | Opius lugens Haliday, 1837
| | |
| Species | Opius lukuganus Fischer, 1968
| | |
| Species | Opius luteiceps Viereck, 1905 Twining screwstem | | |
| Species | Opius luteus Kriechbaumer, 1894
| | |
| Species | Opius macrocerus Thomsom, 1895 Bull filaree, Texas filaree, Texas fillarie | | |
| Species | Opius maculimembris Tobias, 2000
| | |
| Species | Opius magnicornis Wesmael, 1835
| | |
| Species | Opius magnus Fischer, 1958
| | |
| Species | Opius malarator Li, van Achterbergan Achterberg & Tan, 2013
| | |
| Species | Opius malivorellae Fischer, 1964
| | |
| Species | Opius manii
| | |
| Species | Opius manilensis
| | |
| Species | Opius maraquoanus Fischer, 1963
| | |
| Species | Opius marshi Wharton, 2013
| | |
| Species | Opius martiarushensis Fischer, 1963
| | |
| Species | Opius mashhoodi Samiuddin & Ahmad, 2009
| | |
| Species | Opius masoni Fischer, 1964 ⇒ Opius (Rhogadopsis) aberrans
| | |
| Species | Opius mediocarinata Fischer, 1963
| | |
| Species | Opius mediocarinatus Fischer, 1963
| | |
| Species | Opius mediosignum Fischer, 1968
| | |
| Species | Opius melleus
| | |
| Species | Opius mendus Papp, 1982
| | |
| Species | Opius meracus Fischer, 1960 ⇒ Opius pygmaeator
| | |
| Species | Opius mesoniger Jiménez, 1983
| | |
| Species | Opius micans Stelfox, 1957
| | |
| Species | Opius microsomaticus Fischer, 1965
| | |
| Species | Opius minimus Fischer, 1958 ⇒ Opius (Cryptonastes) tersus
| | |
| Species | Opius minor Fischer, 1957 ⇒ Opius (Cryptonastes) gracilis
| | |
| Species | Opius mirabunda Papp, 1982
| | |
| Species | Opius mombinpraeoptantis Fischer, 1966 ⇒ Bracanastrepha anastrephae
| | |
| Species | Opius monilipalpis Li, Van Achterbergan Achterberg & Tan, 2013
| | |
| Species | Opius monininguensis Fischer, 1965
| | |
| Species | Opius montana Ashmead, 1890
| | |
| Species | Opius montevidanus Fischer, 1966
| | |
| Species | Opius muliebris
| | |
| Species | Opius mutus Fischer, 1964 ⇒ Biosteres (Chilotrichia) brevipalpis
| | |
| Species | Opius nablus Wharton, 2013
| | |
| Species | Opius nairobicus Fischer, 1983
| | |
| Species | Opius nanus Provancher, 1888 Freckled milkvetch, Speckledpod milkvetch | | |
| Species | Opius neopusillus Fischer, 1957 ⇒ Opius (Nosopaeopius) ochrogaster
| | |
| Species | Opius nigriceps Szépligeti, 1898 ⇒ Opius (Nosopaeopius) ochrogaster
| | |
| Species | Opius nigricinctus Fischer, 1957 ⇒ Opius (Kainopaeopius) crassicrus
| | |
| Species | Opius nigrithorax Fischer, 1958 ⇒ Opius (Cryptonastes) gracilis
| | |
| Species | Opius nigrocastaneus Viereck, 1905
| | |
| Species | Opius nigrocasteneus Viereck, 1905 Twining screwstem | | |
| Species | Opius nitidulator Nees, 1834
| | |
| Species | Opius nitidus Goureau, 1865
| | |
| Species | Opius nodatus Fischer, 1958 ⇒ Opius (Agnopius) similis
| | |
| Species | Opius notabilis Fischer, 1958
| | |
| Species | Opius notaulicus Fischer, 1964
| | |
| Species | Opius nudiscutum
| | |
| Species | Opius numerosus
| | |
| Species | Opius obscurator Bouche, 1834
| | |
| Species | Opius obscurus Szépligeti, 1901 ⇒ Opius lugens
| | |
| Species | Opius obustus Tobias, 1998
| | |
| Species | Opius ochropus Thomson, 1895
| | |
| Species | Opius oetztalicola Fischer, 1997 ⇒ Opius (Nosopaeopius) aureliae
| | |
| Species | Opius oleracei Fischer, 1963
| | |
| Species | Opius olmosensis Fischer, 1983
| | |
| Species | Opius oophilus Fullaway, 1951 ⇒ Fopius arisanus
| | |
| Species | Opius orbiculator Nees, 1811
| | |
| Species | Opius ornatus Fischer, 1964
| | |
| Species | Opius osogovoensis Fischer, 1964
| | |
| Species | Opius osoguineus Fischer, 2004
| | |
| Species | Opius ottotomoana
| | |
| Species | Opius otwayensis Fischer, 1988
| | |
| Species | Opius ovaliops Fischer, 1980
| | |
| Species | Opius ovator Nees, 1834
| | |
| Species | Opius pachymerus Li, van Achterbergan Achterberg & Tan, 2013
| | |
| Species | Opius pallidipalis Fischer, 1964
| | |
| Species | Opius pallidipes Marshall, 1872
| | |
| Species | Opius pallipes Wesmael, 1835 ⇒ Xenarcha mellipes Cooper wolfberry, Cooper's wolfberry, Peach thorn | | |
| Species | Opius palpalis Szépligeti, 1902
| | |
| Species | Opius pamboloides Tobias, 1986
| | |
| Species | Opius pappianus Fischer, 1986 ⇒ Opius (Opiothorax) graecus
| | |
| Species | Opius paraensis Spinola, 1851
| | |
| Species | Opius paraitepuyensis Fischer, 1964
| | |
| Species | Opius paraplasticus Fischer, 1972
| | |
| Species | Opius paratakomanus Fischer, 1964 ⇒ Opius (Rhogadopsis) pallidipalpalis
| | |
| Species | Opius parawattacoonus Fischer, 1964
| | |
| Species | Opius parvifossa Fischer, 1964
| | |
| Species | Opius parvulus Wesmael, 1835
| | |
| Species | Opius parvungulus Thomson, 1895
| | |
| Species | Opius pegomyiae
| | |
| Species | Opius pequodorum Viereck, 1917 Yellow screwstem | | |
| Species | Opius periclymenii Fischer, 1964 ⇒ Opius (Agnopius) similis
| | |
| Species | Opius perkinsi Fullaway, 1950 ⇒ Utetes perkinsi
| | |
| Species | Opius perproximus Silvestri, 1914
| | |
| Species | Opius perygmaeus Fischer, 1964 California scrub oak borer | | |
| Species | Opius peterseni Fischer, 1964
| | |
| Species | Opius phaeostigma Wilkinson, 1927
| | |
| Species | Opius philippinensis
| | |
| Species | Opius phoenicensis Fischer, 1965
| | |
| Species | Opius phytomyzae Fischer, 1957 ⇒ Opius (Nosopoea) ambiguus
| | |
| Species | Opius piceus Thomson, 1895 Bull filaree, Texas filaree, Texas fillarie | | |
| Species | Opius pimoensis Fischer, 1978
| | |
| Species | Opius pinkbedsanus Fischer, 1964 ⇒ Opius (Thoracosema) igneus
| | |
| Species | Opius pipitae Wharton, 2013
| | |
| Species | Opius placidus Haliday, 1837
| | |
| Species | Opius plovdivensis Zaykov & Fischer, 1983
| | |
| Species | Opius portarthurensis Fischer, 1978
| | |
| Species | Opius posticatae Fischer, 1957
| | |
| Species | Opius propecoracinum Fischer, 1999
| | |
| Species | Opius provancheri Dalla Torre, 1886
| | |
| Species | Opius pseudonapomyzae Fischer, 2005
| | |
| Species | Opius pseudonitida Fahringer, 1943
| | |
| Species | Opius pteridiophius Wharton & Austin, 1990
| | |
| Species | Opius pterostigmalis Szépligeti, 1908
| | |
| Species | Opius pterostigmatus Szépligeti, 1898
| | |
| Species | Opius pulcherrimus Fischer, 1958 ⇒ Opius (Ilicopius) pulchriceps
| | |
| Species | Opius pulchrithorax Fischer, 1958 ⇒ Opius (Misophthora) compar
| | |
| Species | Opius pulchriventris Fischer, 1958
| | |
| Species | Opius punctiscuta Thomson, 1895
| | |
| Species | Opius punctiventris Thomson, 1895 ⇒ Opius (Tolbia) caesus
| | |
| Species | Opius punctivertex Fischer, 1964
| | |
| Species | Opius pusillator Zetterstedt, 1838
| | |
| Species | Opius pusilloides Fischer, 1964 ⇒ Opius (Gastrosema) oscinidis
| | |
| Species | Opius pusillus Szépligeti, 1913
| | |
| Species | Opius pygmaeator Nees, 1811
| | |
| Species | Opius pygmisoma Fischer, 1968
| | |
| Species | Opius pyrosoma
| | |
| Species | Opius quasipulvis Fischer, 1989
| | |
| Species | Opius quercicola Fischer, 1966
| | |
| Species | Opius raoi Fischer, 1966
| | |
| Species | Opius raoiformis Fischer, 2014
| | |
| Species | Opius raphaeli Fischer, 0
| | |
| Species | Opius reptantis Fischer, 1957 ⇒ Opius (Nosopoea) ambiguus
| | |
| Species | Opius resinae Brues, 1933
| | |
| Species | Opius retractus
| | |
| Species | Opius rhagoleticolus Sachtleben, 1934
| | |
| Species | Opius rhodopensis Zaykov, 1983
| | |
| Species | Opius ribeiroensis
| | |
| Species | Opius richmondi Gahan, 1919
| | |
| Species | Opius robsonensis Fischer, 1964
| | |
| Species | Opius rojam Daniels & Wharton, 2013
| | |
| Species | Opius rosae Tobias, 1977
| | |
| Species | Opius rosicola Muesebeck, 1950 California pinefoot | | |
| Species | Opius rossicus Szepligeti, 1901
| | |
| Species | Opius rotundiventris Thomson, 1895
| | |
| Species | Opius rudis Wesmael, 1835 Cooper wolfberry, Cooper's wolfberry, Peach thorn | | |
| Species | Opius rudius Wesmael, 0
| | |
| Species | Opius ruficeps Cameron, 1910 ⇒ Opius provancheri
| | |
| Species | Opius rufisignum Fischer, 1968
| | |
| Species | Opius rufoflavus Fischer, 2001
| | |
| Species | Opius rufus Holmgren, 1868
| | |
| Species | Opius rugosus Wesmael, 1838
| | |
| Species | Opius rumecatus Fischer, 1983
| | |
| Species | Opius ruminans Fischer, 1957 ⇒ Opius pygmaeator
| | |
| Species | Opius rusticus Haliday, 1837
| | |
| Species | Opius sanjoseensis Fischer, 1962
| | |
| Species | Opius sauteri Fischer, 1963
| | |
| Species | Opius scabriculus Wesmael, 1835
| | |
| Species | Opius scaptomyzae Fischer, 1967
| | |
| Species | Opius schlicki Fischer, 1964
| | |
| Species | Opius schuleri Fischer, 1964
| | |
| Species | Opius scutellatus Fischer, 1962
| | |
| Species | Opius seebensteinensis Fischer, 1959
| | |
| Species | Opius seiuncta Fischer, 1959
| | |
| Species | Opius semiaciculatus
| | |
| Species | Opius semipilosus Fischer, 2014
| | |
| Species | Opius sepivalfus Wharton, 1987
| | |
| Species | Opius sequentator Fischer, 1963
| | |
| Species | Opius severini Fischer, 1964
| | |
| Species | Opius shabelliensis Fischer, 1996
| | |
| Species | Opius silvestris Jakimavicius, 1986
| | |
| Species | Opius similiformis Fischer, 1957 ⇒ Opius (Agnopius) similis
| | |
| Species | Opius simplex Fischer, 1962
| | |
| Species | Opius simplicornis Fischer, 0
| | |
| Species | Opius singulator Nees, 1834
| | |
| Species | Opius sitagrus Papp, 1982 ⇒ Opius (Allophlebus) staryi
| | |
| Species | Opius skinneri
| | |
| Species | Opius smarti Fischer, 1966
| | |
| Species | Opius songi Li, van Achterbergan Achterberg & Tan, 2013
| | |
| Species | Opius spec Fischer, 1966
| | |
| Species | Opius sperabilis Tobias, 1998
| | |
| Species | Opius spinaciae Thomson, 1895
| | |
| Species | Opius spretus Haliday, 1837 ⇒ Opius (Allophlebus) singularis
| | |
| Species | Opius stecki Wharton, 2013
| | |
| Species | Opius stelfoxi
| | |
| Species | Opius stigmaticus Fischer, 1958
| | |
| Species | Opius stramineipes Thomson, 1895
| | |
| Species | Opius subangulatus Granger, 1949
| | |
| Species | Opius subpallipes Tobias, 1986
| | |
| Species | Opius subrotundatus Niezabitowski, 1910
| | |
| Species | Opius subsicivus Papp, 1991 ⇒ Opius (Agnopius) uvarovi
| | |
| Species | Opius subsulcatus Fischer, 1964
| | |
| Species | Opius subtilis Szépligeti, 1898 ⇒ Opius (Tolbia) caesus
| | |
| Species | Opius suffixus Fischer, 1964 ⇒ Opius (Rhogadopsis) aberrans
| | |
| Species | Opius superbus Szépligeti, 1898
| | |
| Species | Opius suturalis Hgahan, 1913 Higgin's barberry | | |
| Species | Opius sylvaticus Haliday, 1837
| | |
| Species | Opius tabellariae Fischer, 1964
| | |
| Species | Opius tacita Haliday, 1837
| | |
| Species | Opius taeniatus Fischer, 1957 ⇒ Opius (Apodesmia) rufipes
| | |
| Species | Opius takomaanus Fischer, 1965
| | |
| Species | Opius tambourinicus Fischer, 1988
| | |
| Species | Opius tambourinus Fischer, 1966
| | |
| Species | Opius taramegillae Wharton, 2013
| | |
| Species | Opius tarasi Tobias, 1986
| | |
| Species | Opius tekirdagensis Fischer & Beyarslan, 2005
| | |
| Species | Opius telephosi Fischer, 1970 ⇒ Opius (Merotrachys) peleus
| | |
| Species | Opius terraereginae Fischer, 1966
| | |
| Species | Opius testaceifactus Fischer, 1964 ⇒ Opius pequodorum
| | |
| Species | Opius testaceipes Szépligeti, 1913
| | |
| Species | Opius testaceus Szépligeti, 1914
| | |
| Species | Opius thiemanastrepha
| | |
| Species | Opius thomsoni Fischer, 1971
| | |
| Species | Opius thoracicus Costa, 1883
| | |
| Species | Opius toulonus Fischer, 1964
| | |
| Species | Opius townesi Fischer, 1965
| | |
| Species | Opius toxotrypanae
| | |
| Species | Opius transbaikalicus Fischer, 1999
| | |
| Species | Opius triidadensis
| | |
| Species | Opius trisulcus Thomson, 1895
| | |
| Species | Opius truncatulus Fischer, 1963
| | |
| Species | Opius truncatus Wesmael, 1835
| | |
| Species | Opius tryoni Cameron, 1911
| | |
| Species | Opius tubibasis Fischer, 1978
| | |
| Species | Opius turcmenicus Fischer, 1959 ⇒ Opius (Nosopoea) maculipes
| | |
| Species | Opius turicai Blanchard, 1966 ⇒ Opius (Bellopius) bellus
| | |
| Species | Opius turneri Gahan, 1919
| | |
| Species | Opius tutus Fischer, 1977
| | |
| Species | Opius unguipus
| | |
| Species | Opius unifasciatus Ashmead, 1894
| | |
| Species | Opius urbani Fischer, 1971
| | |
| Species | Opius vandenboschi Fullaway, 1951 ⇒ Fopius vandenboschi
| | |
| Species | Opius variegata Szépligeti, 1896
| | |
| Species | Opius variegatus Szépligeti, 1896
| | |
| Species | Opius varipes Szépligeti, 1898 ⇒ Opius (Opiothorax) levis
| | |
| Species | Opius vernicosus Tobias, 1998
| | |
| Species | Opius vexator Fischer, 1964 ⇒ Opius (Ilicopius) pulchriceps
| | |
| Species | Opius victoriensis Fischer, 1963
| | |
| Species | Opius victus Haliday, 1837
| | |
| Species | Opius violaceae Fischer, 1967
| | |
| Species | Opius watersi
| | |
| Species | Opius weemi
| | |
| Species | Opius wesmaelii Haliday, 1837
| | |
| Species | Opius westerlyanus Fischer, 1964 ⇒ Opius (Baeocentrum) foutsi
| | |
| Species | Opius wichmanni Fischer, 1957
| | |
| Species | Opius wutaishanus Watanabe, 1950
| | |
| Species | Opius xanthippe Fischer, 1959
| | |
| Species | Opius xylostei Marshall, 1897 ⇒ Opius (Agnopius) similis
| | |
| Species | Opius yahuarmayoanus Fischer, 1966
| | |
| Species | Opius yoderi Wharton, 2013
| | |
| Species | Opius youi Li, van Achterbergan Achterberg & Tan, 2013
| | |
| Species | Opius yuracensis Fischer, 1983
| | |
| Species | Opius zacapuensis Fischer, 1964
| | |
| Species | Opius zamoraensis Fischer, 1968
| | |
| Species | Opius zelotes Marshall, 1891
| | |
| Species | Opius zengi Li, van Achterbergan Achterberg & Tan, 2013
| | |
| Species | Opius zeteki
| | |
| Aclisis (Förster, 1862) |
| Ademoneuron (Fischer, 1988) |
| Adontopius (Fischer, 1984) |
| Allophlebus (Fischer, 1972) |
| Allotypus (Förster, 1862) |
| Apodesmia (Förster, 1862) |
| Atoreuteus (Förster, 1862) |
| Aulonotus (Ashmead, 1900) |
| Baeocentrum (Schulz, 1911) |
| Bathystomus (Förster, 1862) |
| Biophthora (Förster, 1862) |
| Brachycentrus (Szépligeti, 1907) |
| Coeloreuteus (Roman, 1910) |
| Cryptognathopius (Fischer, 1984) |
| Cryptonastes (Förster, 1862) |
| Desmatophorus (Thomson, 1895) |
| Desmiostoma (Förster, 1862) |
| Eristernaulax (Viereck, 1913) |
| Eurytenes (Jucundopius) (Fischer, 1984) |
| Eurytenes (Stigmatopoea) (Fischer, 1986) |
| Eutrichopsis (Förster, 1862) |
| Hexaulax (Cameron, 1910) |
| Holconotus (Förster, 1862) |
| Hypocynodus (Förster, 1862) |
| Hypolabis (Forster, 1862) |
| Ilicopius (Fischer, 1992) |
| Jucundopius (Fischer, 1984) |
| Kainopaeopius (Fischer, 1987) |
| Lemnaphilopius (Fischer, 1977) |
| Mesostoma (Cameron, 1905) |
| Mimiropius (Fischer, 1987) |
| Misophthora (Förster, 1862) |
| Neodiospilus (Szépligeti, 1911) |
| Neopius (Gahan, 1917) |
| Nosopaeopius (Fischer, 1972) |
| Nosopoea (Förster, 1862) |
| Odontopoea (Fischer, 1987) |
| Opiothorax (Fischer, 1972) |
| Opius (Adontopius) (Fischer, 1984) |
| Opius (Allophlebus) (Fischer, 1972) |
| Opius (Allotypus) (Förster, 1862) |
| Opius (Baeocentrum) (Schulz, 1911) |
| Opius (Cryptognathopius) (Fischer, 1984) |
| Opius (Cryptonastes) (Förster, 1862) |
| Opius (Hypocynodus) (Förster, 1862) |
| Opius (Ilicopius) (Fischer, 1992) |
| Opius (Kainopaeopius) (Fischer, 1987) |
| Opius (Mimiropius) (Fischer, 1987) |
| Opius (Misophthora) (Förster, 1862) |
| Opius (Nosopaeopius) (Fischer, 1972) |
| Opius (Nosopoea) (Förster, 1862) |
| Opius (Odontopoea) (Fischer, 1987) |
| Opius (Opiothorax) (Fischer, 1972) |
| Opius (Pendopius) (Fischer, 1972) |
| Opius (Stomosema) (Fischer, 1972) |
| Opius (Tolbia) (Cameron, 1907) |
| Pendopius (Fischer, 1972) |
| Phaedrotoma (Förster, 1862) |
| Psyttalia (Walker, 1860) |
| Sternaulopius (Fischer, 1965) |
| Stigmatopoea (Fischer, 1987) |
| Stomosema (Fischer, 1972) |
| Therobolus (Förster, 1862) |
| Tolbia (Cameron, 1907) |
| Utetes (Förster, 1862) |
| Xynobius (Förster, 1862) |