Cruciol, A. H., F. B. Noll, L. A. Stange, and R. B. Lopes. “Five New Species of the Zethus spinosus Species Group (Hymenoptera, Vespidae, Eumeninae, Zethus)”. Zootaxa, vol. 5748, no. 1, Jan. 2026, pp. 56-72, doi:10.11646/zootaxa.5748.1.2.