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Hello all again

I had a fresh specimen given to me yesterday, so I've got a different angled photograph. I tried to pin the wings back and manipulate the calypters to get a dorsal view, but it proved a bit too fiddly with the time I had.


Bluebottle Calypter by Chris_Moody, on Flickr

Is the orangey structure to the lower right of where the wing attaches to the body (and above the calypter), the ridge?

Many thanks for your help!