A Mayfly - Centroptilum bifurcatum
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Centroptilum bifurcatum is distributed from Ontario to eastern British Columbia in Canada, and also occurs in the northern Rocky Mountain States (Webb 2002). In Saskatchewan, C. bifurcatum was found primarily in large rivers. In Oregon, it occurs in Benton, Deschutes, and Malheur Cos. (Meyer and McCafferty 2007). It occurs in western Montana in Flathead, Glacier, Lake, Lincoln Cos. (McCafferty and Newell 2007). It was recently documented in the Humboldt River (just below the confluence of the North Fork), Nevada (Kondratieff and Baumann 2000).
Observations in Montana Natural Heritage Program Database
Number of Observations:
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(Observations spanning multiple months or years are excluded from time charts)
In Saskatchewan, C. bifurcatum was found primarily in large rivers (Webb 2002).
Mature larvae first appeared in early
June and adults were collected between late June and mid-July.
- Literature Cited AboveLegend: View Online Publication
- Kondratieff, B.C. and R.W. Baumann (coordinators). 2000. Stoneflies of the United States. Jamestown, ND: Northern Prairie Wildlife Research Center Home Page.
- McCafferty, W.P. and R.L. Newell. 2007. Insecta, Ephemeroptera: Range extensions and new state records from far western Montana, U.S.A. Check List 3:260-266.
- Meyer, M.D. and W.P. McCafferty. 2007. Mayflies (Ephemeroptera) of the far western United States. Part I: Washington. Transactions of the American Entomological Society 133(1): 21-63.
- Webb, J.M. 2002. The Mayflies of Saskatchewan. M.Sc. thesis, University of Saskatchewan, Saskatoon.
- Additional ReferencesLegend: View Online Publication
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- Hendricks, P., S. Lenard, D.M. Stagliano, and B.A. Maxell. 2013. Baseline nongame wildlife surveys on the Fort Peck Indian Reservation. Report to the Assiniboine and Sioux Tribes of the Fort Peck Indian Reservation. Montana Natural Heritage Program, Helena, MT. 83 p.
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