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Nastasi, L.F., Davis, C.K., Alcorn, J.K., Frey, T.S., Hatfield, M.J., Hines, H.M., Tooker, J.F. and Deans, A.R. 2025. Two new species of Ormyrus Westwood (Hymenoptera: Ormyridae) from Cynipidae (Hymenoptera) galls on Silphium L. (Asteraceae: Heliantheae). Zootaxa. 5601, 2 (Mar. 2025), 265–287. DOI:https://doi.org/10.11646/zootaxa.5601.2.3.