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Microdon ? - Microdon

Microdon ? - Microdon
Allison Park, Allegheny County, Pennsylvania, USA
September 3, 2012
Looks to me like one in the Dimeraspis subgenus but hard to tell from the low resolution photos.

Images of this individual: tag all
Microdon ? - Microdon Microdon ? - Microdon

Moved from Microdon.

Moved from ID Request.

Thank you!

Nice fly! Definitely Microdo
Nice fly! Definitely Microdon or thereabouts, depending on how you sort those flies - the genus was recently revised and many species moved to new genera (see Generic revision and species classification of the Microdontinae (Diptera, Syrphidae)). Can't say beyond that, sadly - the key in the new reference requires too many characters that are hard to see on a living, photographed fly (as opposed to a pinned specimen).

I took a look at the key just
I took a look at the key just in case - and it looks like Microdon (Dimeraspis) to me as well. Here's my chain of logic:

(1) Postmetacoxal bridge - complete/incomplete? Can't tell, but following "incomplete" gets us Rhoga, which is Neotropical.

(2) I see a posterior appendix extending into cell r4+5.

(3) The postpronotum looks pilose.

(4) The abdomen is not constricted.

(5) The antepisternum *looks* haired to me, but I am not 100% sure here.

(43) Basoflagellomere looks oval/parallel-sided

(45) Basoflagellomere is as long as/longer than scape

(46) Antenna longer than distance between antennal fossa and anterior oral margin

(49) Tergites 3 and 4 fused

(51) Brownish

(52) Basoflagellomere less than three times as long as scape

(53) Abdomen wide

I'm curious to see what Martin Hauser thinks, since he was the academic editor for this paper...

for keying it for me, I don't have the knowledge required. I just went by a purely visual comparison but there are very few photos posted and I can only see the reduced versions.

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