The mayfly Rhithrogena virilis was first described in 1934 by McDunnough in western Canada. Since its description, it has been recorded only once. We reared nymphs and provide descriptions and digital photos that may make identification of this species easier.
Newell, Robert L. and Schenck, Donald
"Note on the redescription of the nymph of the mayfly Rhithrogena virilis McDunnough 1934 (Ephemeroptera: Heptageniidae),"
Western North American Naturalist: Vol. 70
, Article 13.
Available at: http://scholarsarchive.byu.edu/wnan/vol70/iss2/13