Callibaetis like this one are typically found hatching in the shallow water and weedbeds along the edges of lakes. Since 1996 Robert K. D. Peterson, associate professor of Entomology at Montana State University, has been photographing insects like mayflies. A collection of his work can be found online at www.montana.edu/yellowstoneinsects/contents.html
RKD Peterson courtesy photo

March 5, 2020