Vélez, Danny, and Felipe Vivallo. “A New South American Species of Centris (Heterocentris) Cockerell, 1899 With a Key to the Species With Horn-Like Projections on the Clypeus (Hymenoptera: Apidae: Centridini)”. Zootaxa 3357, no. 1 (June 26, 2012): 49–55. Accessed April 11, 2025. https://mapress.com/zt/article/view/zootaxa.3357.1.4.