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Is it an Anthomyiid, perhaps? Not sure, but certainly not a Scathophaga, which have more orangey-yellow bodies than this for the most part, and only have one bristle on the sternopleuron (the plate above the middle leg). Equally, it is not any other Scathophagid, for the bristly reason, again.
My Flickr photos...
cf. Hylemya nigrimana, female?
How big was it?
latest pics and diptera videos
These two photos were all I got and I didn't have time to make an accurate estimate of size. I would guess 5-7mm.
Thanks for comments too Ian
I've done some reading around this and its way beyond me but I do note that female H. nigrimana is indistinguishable from H. vagans so if it is Hylemya that's as far as anyone will be able to go.
It does need changing from Scathophaga...either agreement with diptera or a new ID of Anthomyiidae, if that seems right. I'm saving Anthomyiidae for my retirement, so won't pretend to know anything about them!
After my reading I know I couldn't id it as Anthomyiidae. I've agreed Diptera but we are still outranked. It needs someone else to agree Diptera or commit to something more specific.
Good Spot Ian yes you are correct a Hard call neverthe less without a detailed specimen exam
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