Polypedilum trigonus
This record describes Polypedilum trigonus (species). Recorded family: Chironomidae. Recorded order: Diptera.
Identification and Appearance
Generally brown with white legs and halteres. Male has white patches on the side of some abdominal segments, approximately triangular with point forward. Genital features may be necessary to confirm ID. Most of the males here have tergite 5 pale on top, which is not the usual color pattern. The exception is from spring; midges that develop in cold water are often darker.
Classification
- Kingdom
- Animalia
- Phylum
- Arthropoda
- Class
- Insecta
- Order
- Diptera (Flies)
- Superfamily
- Chironomoidea
- Family
- Chironomidae (Non-biting Midges)
- Subfamily
- Chironominae
- Tribe
- Chironomini
- Genus
- Polypedilum
Imported taxonomy record. Source availability varies; see the source references and editorial policy below.
Habitat and Range
Geographic Range
United States east of the Rocky Mountains
About Flies: the wider group
Order-level background for Diptera, the group containing Polypedilum trigonus. Species-specific details appear above.
Group overview
Diptera includes over 150,000 described species of flies, mosquitoes, and midges. Mosquitoes are the deadliest animal on Earth (CDC). Malaria alone causes ~249 million cases and over 608,000 deaths annually, mostly children under 5 (WHO). Vector-borne diseases account for over 17% of all infectious diseases, causing 700,000+ deaths per year.
Ecological role of the group
Despite their disease impact, flies are critical decomposers and pollinators. Hoverflies alone pollinate hundreds of crop and wildflower species. Flies are also the primary food source for many birds, bats, and fish. Forensic entomology relies heavily on fly species for crime scene analysis.
Economic and practical significance of the group
In the U.S., vector-borne disease cases tripled between 2004-2016, with over 640,000 cases reported in that period (CDC). Tickborne diseases doubled from 22,000 to 48,000 annual reports. Globally, mosquito-borne diseases cost billions in healthcare and lost productivity.
Recorded sources for this group: WHO, CDC, PNAS. Imported estimates may describe particular regions or reporting periods.
Photos of Polypedilum trigonus (5)
Photo credits: Contributed by John F. Carr
Frequently Asked Questions About Polypedilum trigonus
What is Polypedilum trigonus?
Polypedilum trigonus is a species in the family Chironomidae, within the order Diptera.
How big is Polypedilum trigonus?
Wing length 2 mm
How do you identify Polypedilum trigonus?
Generally brown with white legs and halteres. Male has white patches on the side of some abdominal segments, approximately triangular with point forward. Genital features may be necessary to confirm ID. Most of the males here have tergite 5 pale on top, which is not the usual color pattern. The exception is from spring; midges that develop in cold water are often darker.
Where is Polypedilum trigonus found?
Range: United States east of the Rocky Mountains