RobSpot's picture

Black fly for id

Observed: 16th June 2012 By: RobSpotRobSpot’s reputation in InvertebratesRobSpot’s reputation in InvertebratesRobSpot’s reputation in Invertebrates
Black fly on hogweed
Description:

This small black fly on hogweed has an upturned 'collar' behind the thorax.

Identifications
Species interactions

No interactions present.

Comments

ophrys's picture

Collar

What you are seeing is the scutellum, but it is not actually upturned. I think it appears so as the alula of the wing has turned up at the side of the scutellum, making the whole thing seem upturned.

Ian
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RobSpot's picture

Thank you

The alula of a hoverfly wing is new to me. I found the abstract of an article explaining it is an indicator of 'gear change' in hoverfly flight.

http://rsif.royalsocietypublishing.org/content/early/2011/11/01/rsif.201...