Tritoxa flexa

(Wiedemann, 1830)

Black Onion Fly

Tritoxa flexa, commonly known as the Black Onion Fly, is a Nearctic of picture-winged fly in the Ulidiidae. It was first described by Wiedemann in 1830 and is one of seven recognized species in the Tritoxa. The species possesses distinctive patterned wings characteristic of ulidiid flies. A 2021 revision of the genus provided species illustrations, distribution maps, and a diagnostic key to differentiate T. flexa from .

Tritoxa flexa, F, Face, MD 2013-06-18-15.32 (23433998311) by USGS Bee Inventory and Monitoring Lab from Beltsville, Maryland, USA. Used under a Public domain license.

Black Onion Fly - Tritoxa flexa, Meadowood Farm SRMA, Mason Neck, Virginia by Judy Gallagher. Used under a CC BY 2.0 license.

Tritoxa flexa, F, Back, MD 2013-06-18-15.27.07 ZS PMax by USGS Bee Inventory and Monitoring Lab. Used under a CC BY 2.0 license.

Pronunciation

How to pronounce Tritoxa flexa: /ˈtɹɪtoʊksə ˈflɛksə/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

Wing patterns can be used to differentiate Tritoxa flexa from other in the , though confident identification of certain sympatric species requires examination of male genitalia. The species is illustrated in the 2021 revision of the Nearctic genus Tritoxa, which includes a key to all seven recognized species.

Images

Distribution

Canada, United States.

Similar Taxa

Tritoxa californicaSympatric in the Nearctic region; requires male genitalia examination for confident differentiation from T. flexa.
Tritoxa decipiensSympatric in the Nearctic region; requires male genitalia examination for confident differentiation from T. flexa.
Tritoxa cuneata in the Nearctic Tritoxa; distinguished by wing patterns.
Tritoxa incurva in the Nearctic Tritoxa; distinguished by wing patterns.
Tritoxa pollinosa in the Nearctic Tritoxa; distinguished by wing patterns.
Tritoxa ra in the Nearctic Tritoxa; distinguished by wing patterns.