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Predatory Fungus Gnat - Macrocera formosa - female

Predatory Fungus Gnat - Macrocera formosa - Female
Mobile (Dog River), Mobile County, Alabama, USA
April 20, 2015
Size: WS=8mm
I'm reasonably sure of ID, based on Tom Murray's image, and on the wornhole that exist between our yards

Range on the info page suggests that Alabama is not in the range, so it may just be a similar species. 23 other species.

Perfect match female specimen photo-voucher
Max, there are subtle differences in the other females, particularly in the venation. Also, notice the longitudinal black stripe on the abdomen, between 2nd and 4th abdominal bands. According to Brad Bard, they "appear to be an internal structure rather than surface coloration." I've looked through all of those images and JC Jones' is the only other female that has all these characteristics.

As for the males, I have no idea.

JC Jones' and David Guzman's match yours better than Tom's if you look at the dark markings on the thorax. (are they important?) Also, since yours isn't in the known range, and there are 23 other species and we don't know how similar they are, I'm not sure "picture matching" is a good way to ID.

I'd say it is at the very least, "formosa-like"
I'd say it is a pretty good match for what I have tentatively ID'd as M. formosa. I wouldn't necessarily discount the same species being in Alabama as our knowledge of distribution is so poor. Also, Khalaf (1971) reported finding M. formosa in Mississippi.

The thoracic markings are variable, apparently, as Johannsen discussed a form of M. formosa with stripes on the thorax.

I have no problem leaving this here, as long as it's made clear it's tentative. We'll have to wait for a revision of the genus before we can be sure what's really out there!

I guess we should move the rest of the "formosa-like" here for now.

probably a couple more, too.

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