Mahogany-dun
Guides
Isonychia bicolor
mahogany dun
Isonychia bicolor, commonly known as the mahogany dun, is a species of brushlegged mayfly in the family Isonychiidae. It is found in southeastern Canada and the eastern United States. Like all mayflies, it undergoes incomplete metamorphosis with aquatic nymphal stages and short-lived winged adults. The species is part of the EPT (Ephemeroptera-Plecoptera-Trichoptera) biological index used to assess water quality.