Dark Cahill

Mayfly in the family Heptageniidae. Lives near water. Its aquatic larva feeds on algae scraped off submerged surfaces.

There are 26 observations of Dark Cahill in Québec, mostly in Outaouais, Laurentides and Montréal, and it has been reported in 9 of the 17 regions. They peak in June and become rare from October to April.