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| Opius aciurae Fischer, 1964 | 0 |
| Opius alachuanus Fischer, 1964 | 0 |
| Opius aldrichi Muesebeck, 1958 | 0 |
| Opius aliricidiae Fischer 1966 | 0 |
| Opius alteratus Fischer, 1964 | 0 |
| Opius anduzei Fischer, 1964 | 0 |
| Opius angustisulcus Fischer 1966 | 0 |
| Opius anthriscoidis Fischer, 1966 | 0 |
| Opius ashmeadii Dalla Torre, 1898 | 0 |
| Opius atriceps Ashmead, 1894 | 0 |
| Opius augustianus Fischer 1966 | 0 |
| Opius basiniger Viereck, 1905 | 0 |
| Opius bellus Gahan, 1931 | 0 |
| Opius bidentis Fischer, 1964 | 0 |
| Opius brooki Fischer, 1965 | 0 |
| Opius brownsvillensis Fischer, 1965 | 0 |
| Opius bruneipes Gahan, 1913 | 0 |
| Opius brunneiventris Cresson, 1872 | 0 |
| Opius buenaventurae Fischer | 0 |
| Opius caprilesi Fischer 1966 | 0 |
| Opius capsicola Muesebeck, 1958 | 0 |
| Opius cardini Fischer | 0 |
| Opius chapini Fischer 1966 | 0 |
| Opius chillcotti Fischer, 1969 | 0 |
| Opius citlus Fischer, 1983 | 0 |
| Opius coleogaster Fischer, 1964 | 0 |
| Opius columbiacus Fischer, 1964 | 0 |
| Opius commodus Gahan, 1915 | 0 |
| Opius compensans Silvestri | 0 |
| Opius completus Fischer | 0 |
| Opius confundens Fischer, 1964 | 0 |
| Opius contrasticus Fischer 1966 | 0 |
| Opius cordobensis Fischer | 0 |
| Opius cordobensis Fischer, 1983 | 0 |
| Opius coriaceus Gahan, 1917 | 0 |
| Opius cortesanus Fischer, 1968 | 0 |
| Opius cosa (Fischer, 1980) | 0 |
| Opius costaricensis Fischer, 1962 | 0 |
| Opius crenulaticeps Fischer | 0 |
| Opius diastatae (Ashmead, 1888) | 0 |
| Opius dimidiatus (Ashmead, 1889) | 0 |
| Opius dissitus Muesebeck, 1963 | 0 |
| Opius dominicanus Fischer, 1963 | 0 |
| Opius eupatorii Fischer, 1966 | 0 |
| Opius extensus Fischer, 1964 | 0 |
| Opius facialis Fischer | 0 |
| Opius fennahi Fischer 1966 | 0 |
| Opius flaveolaris Fischer 1966 | 0 |
| Opius formosanus Fullaway | 0 |
| Opius forticornis Cameron, 1904 | 0 |
| Opius gabrieli Fischer, 1968 | 0 |
| Opius gainesvillensis Fischer, 1964 | 0 |
| Opius galomirus Fischer, 1968 | 0 |
| Opius glabrifossa Fischer | 0 |
| Opius glabripleurum Fischer 1966 | 0 |
| Opius grenadensis Ashmead, 1900 | 0 |
| Opius guatemalensis Fischer | 0 |
| Opius harmonicus Fischer, 1964 | 0 |
| Opius hemifuscus Fischer, 1966 | 0 |
| Opius hermosanus Fischer, 1964 | 0 |
| Opius hirtus Fischer, 1963 | 0 |
| Opius igneus Fischer, 1964 | 0 |
| Opius impressiformis Fischer, 1964 | 0 |
| Opius incoligma Fischer, 1979 | 0 |
| Opius insularis Ashmead, 1894 | 0 |
| Opius interjectus Fischer, 1965 | 0 |
| Opius interstitialis Ashmead, 1894 | 0 |
| Opius iridipennis Cameron, 1904 | 0 |
| Opius jamaicensis Fischer | 0 |
| Opius jipanus Fischer, 1983 | 0 |
| Opius lacajensis Fischer, 1962 | 0 |
| Opius languidus Fischer, 1964 | 0 |
| Opius lateroareatus Fischer, 2001 | 0 |
| Opius lemonensis Fischer, 1964 | 0 |
| Opius leptosoma Fischer | 0 |
| Opius lissopleurum Fischer 1966 | 0 |
| Opius longifoveatus Fischer, 1964 | 0 |
| Opius longissimicauda Fischer, 1962 | 0 |
| Opius malivorellae Fischer, 1964 | 0 |
| Opius mandibularis Gahan, 1915 | 0 |
| Opius martini Fischer, 1965 | 0 |
| Opius maximiliani Fischer | 0 |
| Opius melanocephalus Ashmead, 1894 | 0 |
| Opius metatensis Fischer, 1964 | 0 |
| Opius microscopius Fischer | 0 |
| Opius mitiformis Fischer, 1964 | 0 |
| Opius mitis Fischer, 1963 | 0 |
| Opius moderatus Fischer | 0 |
| Opius monotonus Fischer, 1962 | 0 |
| Opius myakkensis Fischer, 1964 | 0 |
| Opius nigritibia Fischer | 0 |
| Opius northcarolinensis Fischer, 1964 | 0 |
| Opius novocaledonicus (Ashmead) | 0 |
| Opius nympha Fischer, 1968 | 0 |
| Opius oophilus Fullaway | 0 |
| Opius orizabensis Fischer, 1963 | 0 |
| Opius otiosus Gahan, 1917 | 0 |
| Opius panamanus Fischer 1966 | 0 |
| Opius paradisiacus Fischer, 1964 | 0 |
| Opius paraitepuyensis Fischer | 0 |
| Opius pauper Fischer, 1964 | 0 |
| Opius pequodorum Viereck, 1917 | 0 |
| Opius petiolaris Fischer, 1965 | 0 |
| Opius petri Fischer, 1968 | 0 |
| Opius porteri Fischer, 1964 | 0 |
| Opius posadai Fischer 1966 | 0 |
| Opius pubescens Fischer, 1964 | 0 |
| Opius puertoplatanus Fischer, 2001 | 0 |
| Opius puncticeps Fischer | 0 |
| Opius punctipes Fischer, 1964 | 0 |
| Opius pyrogaster Fischer 1966 | 0 |
| Opius rejectus Ashmead, 1894 | 0 |
| Opius rojam Daniels & Wharton, in Wharton et al., 2013 | 0 |
| Opius rossi Fischer | 0 |
| Opius ruficolor Fischer, 1964 | 0 |
| Opius rufoflavus (Fischer, 2001) | 0 |
| Opius rugificus Fischer | 0 |
| Opius rugosulus Fischer, 1962 | 0 |
| Opius rugusolus Fischer | 0 |
| Opius salvinii Ashmead, 1894 | 0 |
| Opius sanestabanensis Fischer | 0 |
| Opius sanjoseensis Fischer, 1962 | 0 |
| Opius schildi Fischer, 1964 | 0 |
| Opius schlingeri Fischer | 0 |
| Opius shenefelti Fischer | 0 |
| Opius signicoxa Fischer, 1969 | 0 |
| Opius simillimus Fischer, 1964 | 0 |
| Opius simplex Fischer, 1962 | 0 |
| Opius soledadensis Fischer | 0 |
| Opius solus Fischer | 0 |
| Opius stiativentris Gahan, 1915 | 0 |
| Opius striatoides Fischer 1966 | 0 |
| Opius strouhali Fischer, 1962 | 0 |
| Opius subvisibilis Fischer, 1964 | 0 |
| Opius superficiarius Fischer, 1969 | 0 |
| Opius surrubresanus Fischer, 1964 | 0 |
| Opius suturalis Gahan, 1913 | 0 |
| Opius taiensis (Ashmead) | 0 |
| Opius tangens Fischer, 1964 | 0 |
| Opius tantillus Ashmead, 1900 | 0 |
| Opius terebrifer Fischer, 1968 | 0 |
| Opius tergitalis Fischer, 1966 | 0 |
| Opius tolucaensis Fischer, 1968 | 0 |
| Opius transatlanticus Fischer | 0 |
| Opius triplehorni Fischer, 1979 | 0 |
| Opius tropaeoli Fischer 1966 | 0 |
| Opius turneri Gahan, 1919 | 0 |
| Opius turrialbanus Fischer | 0 |
| Opius unicatus Fischer | 0 |
| Opius unifasciatus Ashmead, 1894 | 0 |
| Opius unificatus Fischer | 0 |
| Opius uniformis Fischer | 0 |
| Opius unitus Fischer | 0 |
| Opius unus Fischer | 0 |
| Opius utahensis Gahan, 1913 | 0 |
| Opius utinanus Fischer, 2001 | 0 |
| Opius vierecki Gahan, 1915 | 0 |
| Opius villavicenciensis Fischer | 0 |
| Opius visibilis Fischer, 1964 | 0 |
| Opius walleyi Fischer, 1964 | 0 |
| Opius zacapuensis Fischer, 1964 | 0 |
| 0 |