Stegopterna mutata

Stegopterna mutata is a species of black fly in the family Simuliidae, first described by Malloch in 1914 under the basionym Prosimulium mutatum. The species belongs to the tribe Prosimuliini, a group of primitive black flies. Like other simuliids, adults are small, blood-feeding dipterans with aquatic larval stages. The specific epithet "mutata" (Latin for "changed" or "mutated") gives rise to its common name "mutated black fly."