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Ceriini? - Sphiximorpha

Ceriini? - Sphiximorpha
Tucson Botanical Gardens, Tucson, Pima County, Arizona, USA
March 30, 2011
Size: ~8-10 mm
Pretty sure I have the right family (Syrphidae), and maybe tribe (Ceriini), but hoping for confirmation or maybe even a genus. Thank you.

Something new in either Sphiximorpha or Polybiomyia?
Since the frontal prominence is short here, this is presumably either Sphiximorpha or Polybiomyia. Unfortunately, as in nearly every "in-the-wild" photo like this on BugGuide, the technical character separating the two genera (membranous vs. sclerotized connective bridge between the hind coxae) is not discernible here. So what is the basis for assuming Sphiximorpha rather than Polybiomyia here?

In the most recent key for Sphiximorpha in Thompson(2012), there are only 2 species listed as occuring in Arizona: S. loewi (Williston) 1887, and S. currani Thompson 2011. Thompson's key indicates the latter has a yellow scutellum, while the former is described (by Williston) as also having a yellow scutellum, though it appears more rufous in the post below, which otherwise agrees quite well with Williston's original description of Ceria loewi:


So...since the scutellum in the photo here is black, presumably this is not one of the known species of Sphiximorpha.

On the other hand, this doesn't seem to key out well in Shannon's key for Polybiomyia either. P. engelhardti appears to be the best (though imperfect) fit, but again it's indicated to have a yellow scutellum. And the 2nd best fit, P. pedicellata has 3rd abdominal segment longer than wide (see BOLD image here), which doesn't fit here.

Thus, whether it's Sphiximorpha or Polybiomyia...this may be a new undescribed species.

Moved from Syrphid Flies.

Looks like a Sphiximorpha sp., but not one that's already in the guide.... Nice find Eric!

Cropped and moved for expert attention.
Moved from ID Request.

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