Fucellia tergina
This record describes Fucellia tergina (species). Recorded family: Anthomyiidae. Recorded order: Diptera.
Identification and Appearance

Separated from F. maritima by the narrower genae (allegedly 0.5-0.65 times eye height compared to 0.6-0.7 times) and the absence of setulae between the presutural two rows and pairs of acrostichal setae. In males, the ventral femoral knob lacks a distal sharp point and, in females, none of the posteroventral hairs on the hind femora are longer than the width of the hind tibia.
Classification
- Kingdom
- Animalia
- Phylum
- Arthropoda
- Class
- Insecta
- Order
- Diptera (Flies)
- Superfamily
- Muscoidea
- Family
- Anthomyiidae (Root-Maggot Flies)
- Subfamily
- Anthomyiinae
- Tribe
- Fucelliini
- Genus
- Fucellia (Seaweed Flies)
Imported taxonomy record. Source availability varies; see the source references and editorial policy below.
Habitat and Range
Geographic Range
Alaska, south to Sonora; Illinois to Labrador, south to Florida; Greenland; Bermuda
Additional species information
Species notes from the sources
Etymology: Fucellia tergina Zetterstedt, 1845
About Flies: the wider group
Order-level background for Diptera, the group containing Fucellia tergina. 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 Fucellia tergina (5)
Photo credits: Contributed by Brad Barnd; Additional contributions by Arturo Santos
Frequently Asked Questions About Fucellia tergina
What is Fucellia tergina?
Fucellia tergina is a species in the family Anthomyiidae, within the order Diptera.
How do you identify Fucellia tergina?
Separated from F. maritima by the narrower genae (allegedly 0.5-0.65 times eye height compared to 0.6-0.7 times) and the absence of setulae between the presutural two rows and pairs of acrostichal setae. In males, the ventral femoral knob lacks a distal sharp point and, in females, none of the posteroventral hairs on the hind femora are longer than the width of the hind tibia.
Where is Fucellia tergina found?
Range: Alaska, south to Sonora; Illinois to Labrador, south to Florida; Greenland; Bermuda
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