[1]
Zhang, R.-N., Achterberg, C.V., Tian, X.-X., He, C.-Y. and Tan, J.-L. 2020. Sexual variation in two species of Helorus Latreille (Hymenoptera, Heloridae) from NW China, with description of female of Helorus caii He & Xu. Zootaxa. 4821, 3 (Aug. 2020), 570–584. DOI:https://doi.org/10.11646/zootaxa.4821.3.8.