Sand fly

Sand fly is a common name for small biting flies, especially members of the subfamily Phlebotominae in the family Psychodidae.

Sand fly is a common name for small biting flies, particularly members of the subfamily Phlebotominae in the family Psychodidae; these insects are medically important because some species transmit parasites and viruses, including agents of leishmaniasis and pappataci fever. The term is also used more loosely for some other small biting flies in different families. Sand flies are recorded in the southern part of the range of the Americas, and Canadian public-health and veterinary literature may reference them in the context of travel-related leishmaniasis and bite prevention.

Taxonomy and naming

The term sand fly commonly refers to phlebotomine flies in the family Psychodidae, though some sources note older or broader usage that can include other biting flies. Most authoritative sources place true sand flies in the family Psychodidae, subfamily Phlebotominae. The name is colloquial rather than a precise taxonomic label.

Appearance and biology

Sand flies are very small, moth-like flies with hairy bodies, long legs, and wings held at an angle when resting. They are about 1.5–4 mm long. Females of many species blood-feed, while males typically feed on plant sugars. They pass through egg, larval, pupal, and adult stages, and adults are usually active at night.

Habitat and distribution

Sand flies are found mainly in warm, humid tropical and subtropical regions, with some species in temperate zones. Their immature stages develop in sheltered places containing moisture and organic material, such as soil, cracks, burrows, and leaf litter.

Medical importance

Several sand fly species are vectors of human and animal disease. The best-known is leishmaniasis, caused by Leishmania parasites, and some species also transmit pappataci fever virus and other pathogens.