Sewage-flies
Guides
Leptocera
Leptocera is a genus of small flies in the family Sphaeroceridae (Diptera), established by Olivier in 1813. The genus includes multiple subgenera with divergent ecological specializations: the nominate subgenus Leptocera contains species associated with decaying organic matter including sewage systems, while the subgenus Thoracochaeta is restricted to marine supralittoral habitats. Several species have been documented as pests in artificial environments. The genus is distributed across multiple biogeographic regions including the Nearctic, with some species recently introduced to North America.
Psychoda
moth fly, drain fly, filter fly
Psychoda is a large genus of moth flies (family Psychodidae) containing over 400 described species. These tiny, moth-like flies are characterized by their dense body hair, broad wings held roof-like over the body, and long antennae. They are commonly associated with moist, decaying organic matter and are frequently encountered in sewage systems, drains, and bathrooms where they can become nuisance pests. The genus has worldwide distribution with records from North America, Europe, the Middle East, and South America.