Clogmia albipunctata

Adults are distinguished from other small flies by the combination of: broad, hairy wings held roof-like over the body giving a moth-like appearance; distinctive wing pattern of paired black spots centrally and white marginal spots; antennae longer than the abdomen with white hairs; and legs with white rings at tibial and metatarsal tips. Similar moth flies in Psychodidae lack this specific spot pattern. Distinguishable from sand flies (subfamily Phlebotominae) by non-biting mouthparts and wing venation. Larvae identified by presence of 26 dorsal chitinous plates, dense black setae, and conical caudal siphon.

Larval habitat consists of aquatic or subaquatic environments with moist, decaying organic matter: sink drains, shower drains, floor drains, sewer drains, sewage treatment plants, septic tanks, sump pump pits, elevator pits, compost heaps, clogged rain gutters, birdbaths, plant pots, swamps, and forest decaying matter. Adults occur in same vicinity, commonly found perched on walls near breeding sites. Strongly associated with anthropogenic structures; can breed continuously indoors during winter months while adults spread outdoors during temperate seasons.

Cosmopolitan with worldwide distribution in tropical and temperate areas. Documented occurrences include: Asia (Japan, India, China, Palestine, Taiwan), Europe (Belgium, Croatia, Germany, Austria, Greece, Slovenia, Slovakia, Switzerland, UK, France), Africa (Egypt, Morocco), and North America (USA). Common in urban and suburban environments globally.

Adults active year-round in indoor environments; continuous breeding possible indoors during winter months. Adults more active in evening hours and attracted to lights after dark. Outdoor populations more prevalent during temperate seasons.

Larvae are copro-saprophagous, feeding on algae, fungi, microbes, and decaying organic matter in gelatinous biofilms lining drains. Adults sustain themselves by drinking water or consuming flower nectar.

Holometabolous with four stages: egg, larva (four instars), pupa, and adult. Eggs hatch in 32–48 hours. Larval development spans approximately 9–15 days to 18 days across four instars. Pupal stage lasts 5 days to 20–40 hours depending on conditions. Adult lifespan approximately 12 days. Total egg-to-adult period averages 27±5 days. Female lays 200–300 eggs lifetime. Temperature and humidity accelerate development; laboratory rearing at 25°C produced adult in 11 days.

Adults are weak fliers with limited movement, spending most of their life stationary on walls. Both adults and larvae possess water-repellent hairs that protect against drowning and water-borne toxins. Adults are non-biting and non-hematophagous. Attracted to light after dark. Larvae remain in moist organic substrate.

Important decomposer of organic matter in aquatic and decaying environments, particularly in sewage treatment systems where larvae are considered beneficial organisms. Potential mechanical vector for bacteria: documented carriage of 45 bacterial species including nosocomial pathogens, with location-specific microbial communities dominated by environmental bacteria (Pseudomonas, Ralstonia) but also including potential clinical taxa (Mycobacterium, Acinetobacter baumannii, Providencia, Nocardia). Can plug pipes and cause food or water contamination through bacterial dispersal. Airborne scales from dead adults may cause allergic respiratory reactions.

Common household nuisance pest associated with drains; infestations indicate presence of moist organic matter in plumbing. Not harmful to public health in the sense of biting or disease transmission, though mechanical bacterial transmission is possible. Control requires elimination of larval food source through thorough mechanical drain cleaning for at least three weeks; chemical treatments largely ineffective due to water-repellent hairs. Monitoring possible with jar traps, adhesive tape, or light traps. Historically reported but critically unverified as cause of true myiasis; single documented case of facultative infestation in dental residual root with decaying food material.

• Psychoda spp.Other moth flies in same family; lack distinctive black-and-white spotted wing pattern of C. albipunctata
• Phlebotominae (sand flies)Biting relatives in family Psychodidae; possess piercing mouthparts, different wing venation, and are vectors of leishmaniasis
• Drosophila spp. (fruit flies)Different family (Drosophilidae) with large red eyes, smoother bodies, and attraction to fresh fruit rather than decaying matter in drains

Widely reported in literature as causative agent of human myiasis (urogenital, intestinal, nasopharyngeal, oral), but critical review of 51 publications found no incontestable epidemiological, entomological, or clinical evidence confirming true myiasis. Most cases lacked lesion documentation, proper larval isolation from lesions, or clinical abnormalities. The species' non-hematophagous, saprophagous biology makes tissue invasion unlikely; reported cases likely represent misinterpretation, contamination, or delusional parasitosis. Single verified case involved facultative infestation of pre-existing cavity (dental residual root) with decaying organic matter, not tissue feeding.

• drain fly
• bathroom pest
• sewage treatment
• decomposer
• non-biting
• cosmopolitan
• urban pest
• mechanical vector

• BugGuide
• Wikipedia
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Bug Eric: Moth Flies
• Clogmia albipunctata (Nematocera; Psychodidae) as the Etiologic Agent of Myiasis: True or False?
• A Rare Case of Human Residual Root Myiasis Caused by Clogmia Albipunctata Larvae(Diptera: Psychodidae)
• Distinct microbial communities of drain flies (Clogmia albipunctata) across sites with differing human influence
• Breaking anterior-posterior symmetry in the moth fly Clogmia albipunctata.