Callibaetis sp. 

This is a mayfly in the genus Callibaetis. Once the adult female mates, she typically remains stationary for around five days while her eggs mature. Once the eggs are ready to be deposited the female flies to a desirable water source to unload her eggs. The eggs will hatch immediately after they hit the water. There are about 30 species in the Callibaetis genus.

Order: Ephemeroptera
Family: Baetidae
Species: Callibaetis sp. 

Photograph: © 2014 RKD Peterson
Date of Photograph: 19 July 2014
Location: Montana, Gallatin Co. (45o43'41" N 111o08'11" W)