Region distribution/taxonomy are based on Mayfly Central's N.A. Species List and C.A. Species List.
State/Province distribution is based on:
*1: Distribution of mayfly species of North America, by R. P. Randolph, supplemented by
Mayflies (Ephemeroptera) of the far western United States by M. D. Meyer & W. P. McCafferty
 (*2: Part I: Washington), supplemented by
 (*3: Part II: Oregon), supplemented by
*4: The Mayflies Of Saskatchewan by J. M. Webb, supplemented by
*5: The Ephemeroptera Of North Carolina by S. R. Beaty, supplemented by
*6: Pennsylvania Mayflies by Greg Hoover, supplemented by
*7: Insecta, Ephemeroptera: New Alabama state records by McCafferty & Webb, supplemented by
*8: Insecta, Ephemeroptera: New records for Ontario by McCafferty, Jacobus, Webb, and Meyer, supplemented by
*99: A DNA Barcode Library for North American Ephemeroptera: etc. by Webb, Jacobus, Funk, et. al.