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- Opius Wesmael, 1835: 115. Type species: Opius pallipes Wesmael, 1835. Subsequent designation (Wharton 1987b, ICZN 1988).
Van Achterberg and Salvo (1997) restricted the name Opius to species with a basal lobe on the mandible, referring to a classification in press that has yet to be published. A major concern in this regard is that the type species of Biosteres Foerster, another large genus within the Opiinae, also has a basal mandibular lobe. Until a more complete classification is offered, we prefer to treat Opius in a much broader sense as a repository for the bulk of the Opiinae whose relationships remain uncertain, largely following the approach of Fischer (1972) and Wharton (1997).
Diagnoses are presented below for two species that represent a fairly diverse group of neotropical Opiinae that differ from both Lorenzopius and Tubiformopius in several features. These species all have a narrow, parallel-sided T1 and distinctly visible S1, though S1 is never as long as in Lorenzopius, and seldom as long as in Tubiformopius. Ultimately, the relationships of genus group taxa such as Eurytenes s.l., Lorenzopius, and Tubiformopius will have to be carefully considered in order to place the many neotropical species with a distinct S1.
- Wharton, R; Ward, L; Miko, I; 2012: New neotropical species of Opiinae (Hymenoptera, Braconidae) reared from fruit-infesting and leaf-mining Tephritidae (Diptera) with comments on the Diachasmimorpha mexicana species group and the genera Lorenzopius and Tubiformopius ZooKeys, 243: 27-82. doi
- Wharton R (1987b) Opius Wesmael, 1835 (Insecta: Hymenoptera): proposed designaton of Opius pallipes Wesmael, 1835 as type species. Z. N. (S.) 2561. Bulletin of Zoological Nomenclature 43: 369-371.
- International Commission on Zoological N (1988) Opinion 1497. Opius Wesmael, 1835 (Insecta, Hymenoptera): Opius pallipes Wesmael, 1835 designated as type species. Bulletin of Zoological Nomenclature 45: 175-176.
- Van Achterberg C, Salvo A (1997) Reared Opiinae (Hymenoptera: Braconidae) from Argentina. Zoologische Mededelingen Leiden 71: 189-214.
- Fischer M (1972) Hymenoptera Braconidae (Opiinae I). Das Tierreich 91: 1-620.
- Wharton R (1997) Generic relationships of opiine Braconidae (Hymenoptera) parasitic on fruit-infesting Tephritidae (Diptera). Contributions of the American Entomological Institute 30: 1-53.