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Kaliwatan sa insekto ang Opius nadus.^[1] Una ning gihulagway ni Papp ni adtong 1985.^[2] Ang Opius nadus sakop sa kahenera nga Opius, ug kabanay nga Braconidae.^[1][3] Walay nalista nga matang nga sama niini.^[1]

1. ↑ ^{1.0 1.1 1.2} Roskov Y., Kunze T., Orrell T., Abucay L., Paglinawan L., Culham A., Bailly N., Kirk P., Bourgoin T., Baillargeon G., Decock W., De Wever A., Didžiulis V. (ed) (2019). "Species 2000 & ITIS Catalogue of Life: 2019 Annual Checklist". Species 2000: Naturalis, Leiden, the Netherlands. ISSN 2405-884X. TaxonID: 6543558. Retrieved 2019-11-11. {{cite web}}: |author= has generic name (help)CS1 maint: multiple names: authors list (link)
2. ↑ Papp, J. (1985) Taxonomical and faunistical novelties of the Opiinae from the Old World Tropics (Hymenoptera: Braconidae). , Acta Zoologica Hungarica. 31(1-3):185-216.
3. ↑ Yu D.S.K. (2019). Taxapad Ichneumonoidea (version May 2009). In: Species 2000 & ITIS Catalogue of Life, 2019 Annual Checklist (Roskov Y., Ower G., Orrell T., Nicolson D., Bailly N., Kirk P.M., Bourgoin T., DeWalt R.E., Decock W., Nieukerken E. van, Zarucchi J., Penev L., eds.). Digital resource at www.catalogueoflife.org/annual-checklist/2019. Species 2000: Naturalis, Leiden, the Netherlands. ISSN 2405-884X.