River-blindness
Guides
Simuliidae
black flies, buffalo gnats, turkey gnats, white socks
Black flies are small, humpbacked flies in the family Simuliidae, comprising over 2,200 formally described species. Only females bite, using serrated mandibles to slash skin and lap pooled blood for egg development. They are vectors of Leucocytozoon parasites causing leucocytozoonosis in birds and, in some regions, filarial worms causing river blindness in humans. Larvae develop exclusively in flowing freshwater, attaching to submerged substrates with specialized hooks.