Leopoldius signatus
This record describes Leopoldius signatus (species). Recorded family: Conopidae. Recorded order: Diptera.
Identification and Appearance

Whilst superficially resembling Conops species, Leopoldius species can be immediately recognised by their soft proboscis, nothing like the long sclerotised mouthparts found in Conops . There are only two predominantly yellow British species. Males of L. signatus can be separated by genitalia differences, a lack of black facial markings, and black-ringed hind femora. Females by 3 triangular projections from the hind margins of the black bands on tergites 2-4. Unless identified by a recognised expert, a photo is required showing the diagnostic features. Believed to use Common Wasp ( Vespula vulgaris ) as a host. Widespread across England and Wales, but little recorded. Greater concentration on recording at Ivy in autumn is leading to an increase in records. The record from Wood Close Plantation was the first for VC55. No additional images available for this species.
Classification
Habitat and Range
Habitat
Best searched for at Ivy in autumn.
Seasonal Activity
Autumn, peaking in September-October.
Diet and Behavior
Life History
Believed to use Common Wasp (
Additional species information
Recorded status
Widespread across England and Wales, but little recorded. Greater concentration on recording at Ivy in autumn is leading to an increase in records.
About Flies: the wider group
Order-level background for Diptera, the group containing Leopoldius signatus. 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 Leopoldius signatus (4)
Frequently Asked Questions About Leopoldius signatus
What is Leopoldius signatus?
Leopoldius signatus is a species in the family Conopidae, within the order Diptera.
Where is Leopoldius signatus found?
Habitat: Best searched for at Ivy in autumn.
When is Leopoldius signatus active?
Leopoldius signatus: seasonal activity - Autumn, peaking in September-October..
What is the life cycle of a Leopoldius signatus?
Believed to use Common Wasp (
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