Simuliidae

Definition

A family of small, stout-bodied nematoceran flies (order Diptera, infraorder Culicomorpha) commonly called black flies or buffalo gnats. Adults of most species are obligate blood-feeders on mammals and birds, using blade-like mouthparts to slice skin and lap pooled blood; females require blood meals for egg maturation. Larvae and pupae are aquatic, attaching to rocks and vegetation in well-oxygenated running water (streams, rivers, spillways) where they filter-feed and respire through filamentous gills. Simuliidae are significant vectors of Onchocerca volvulus, the filarial nematode causing human onchocerciasis (river blindness), and are notorious pests in northern temperate and boreal regions. The family comprises over 2,200 described species in two subfamilies: the monotypic Parasimuliinae (four species) and the speciose Simuliinae, with the genus Simulium alone containing more than 1,800 species.

Etymology

From Simulium (type genus, Latin simulo 'to feign, mimic') + -idae (family suffix)

Example

Simulium damnosum, a member of the Simuliidae, is the principal vector of onchocerciasis across West Africa, with larval stages developing in rapids and cascades of fast-flowing rivers.

Synonyms

• Black flies
• buffalo gnats
• turkey gnats

Related Terms

• Simulium
• Culicomorpha
• Chironomoidea
• Nematocera
• Onchocerciasis
• Onchocerca
• blood-feeding
• filter-feeding
• lotic habitat

Usage Notes

The common name 'black fly' is widely used in North America, while 'buffalo gnat' refers to the humpbacked thorax of adults. Simuliidae are distinguished from other biting flies by their short antennae (11 segments, not plumose), stout humped thorax, and aquatic immature stages in running water—not stagnant pools. The family is sister to Chironomidae (non-biting midges) and Ceratopogonidae (biting midges) within Chironomoidea. Species-level identification often requires microscopic examination of larval gill histoblasts, pupal cocoons and respiratory filaments, or adult genitalia; cytogenetic analysis of polytene chromosomes is standard for Simulium species complexes.