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I have an easy pictorial key:
Korneyev, V. A., & Evstigneev, D. A. (2013). Key to European species of the genus Oxyna Robineau-Desvoidy, 1830 (Diptera: Tephritidae), with new records from Russia. Ukrainska Entomofaunistyka, 4(1), 1–23. https://doi.org/1...do.8310765