Hershler, Robert, and Hsiu-Ping Liu. “New Species and Records of Pyrgulopsis (Gastropoda: Hydrobiidae) from the Snake River Basin, Southeastern Oregon: Further Delineation of a Highly Imperiled Fauna”. Zootaxa 2006, no. 1 (February 9, 2009): 1–22. Accessed May 3, 2025. https://www.mapress.com/zt/article/view/zootaxa.2006.1.1.