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Small headed fly - _Turbopsebius sulphuripes_




Technically, this is copy-pasta, but, I'm the author Razz


This is a small-headed fly (Family Acroceridae) that I collected back in 2006, that I just decided to identify (flies really aren't my thing), determining it to be Turbopsebius sulphuripes (Loew).

Acroceridae tend to be parasitoids of spiders, with the larvae finding and entering adult spiders, eating it alive from the inside, then emerging to pupate, often in the spider's web. Turbopsebius sulphuripes is really no different, and, from what I can gather, specializes on a funnel weaver, Coras montanus. Interestingly, Turbopsebius spp. lay their eggs (near host spiders) while in flight!

If you take a look at the leading edge of the wing, you'll notice a small projection, a costal tooth. This is somewhat diagnostic of male T. sulphuripes, while the female lacks the tooth, their wings are somewhat hairy (infuscate). Pterodontia males also possess a costal tooth, but it is less pronounced and close to the tip of the wing.
Despite having rather small heads, you can see they have very large eyes, taking up most of the head; their eyes are holoptic (holo - whole, optic - eye), which is a feature of subfamily arcocerinae. In Turbopsebius, you can see they eyes are also somewhat hairy, or pilose.



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