Tropidia quadrata
(Say, 1824)
Common Thick-leg Fly, Common Thickleg Fly
Tropidia quadrata is a of () found across north-central North America. are commonly observed on flowers, where they feed on nectar and pollen. The are aquatic, a distinctive trait within the . The species is notable for its thickened hind legs, which give rise to its .
Pronunciation
How to pronounce Tropidia quadrata: //trɔˈpɪdiə kwɒˈdreɪtə//
These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.
Identification
The common thick-leg can be distinguished from other flies by its notably swollen hind . The aquatic larval separates it from most other , which typically have terrestrial or . It may be confused with other Tropidia species, but the combination of distribution range and leg aids identification.
Images
Appearance
have characteristically thickened hind , giving the appearance of 'thick legs.' As a member of , the body is generally compact with large typical of . Specific coloration and patterning details are not well documented in available sources.
Habitat
are found in association with flowers in open . inhabit aquatic environments, though specific water body are not documented.
Distribution
North America: north-central United States and southern Canada. Specific records include Vermont and other US states.
Diet
feed on nectar and pollen from flowers. Larval diet is unknown but likely involves matter in aquatic environments.
Life Cycle
Larval stage is aquatic. Details of deposition, , and developmental timing are not documented.
Behavior
have been observed visiting flowers. Like other , they are capable of sustained hovering . No other specific behaviors are documented.
Ecological Role
likely contribute to through flower visitation. Larval aquatic suggests a role in in freshwater systems.
Human Relevance
No significant documented interactions. may be observed by naturalists and photographers due to their flower-visiting .
Similar Taxa
- Other Tropidia speciesShare the and general , but T. quadrata is distinguished by its specific distribution and leg structure.
- Other Syrphidae with aquatic larvaeFew have aquatic ; most Eristalinae larvae are found in decaying matter or tissues.
More Details
Taxonomic history
Originally described as Xylota quadrata by Thomas Say in 1824, later transferred to Tropidia.
Observation frequency
The has over 1,600 observations on iNaturalist, indicating it is regularly encountered by citizen scientists in its range.