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