Diptera.info :: Identification queries :: Diptera (adults)
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 two Therevidae (?)
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| Sundew |
Posted on 29-07-2009 23:40
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 Member Location: Berlin and Baden-Württemberg, Germany Posts: 3917 Joined: 28.07.07 |
Hi, no combined threads, I know, but these two, male and female, seem to be closely related - may be the same species, if there is sexual dimorphism? As to the peculiar antennae, my guess is Therevidae, though I expected them to be much more hairy. May be, I overlooked a more appropriate family? Thanks for help, Sundew This is the male. Sundew attached the following image:  [144.73Kb] |
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| Sundew |
Posted on 29-07-2009 23:41
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Member Location: Berlin and Baden-Württemberg, Germany Posts: 3917 Joined: 28.07.07 |
This is the female.
Sundew attached the following image:  [116.31Kb] |
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| Zeegers |
Posted on 30-07-2009 18:28
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Member Location: Soest, NL Posts: 19011 Joined: 21.07.04 |
Yes, these are Therevidae, something like Thereva annulata. Coastal dune area ? Theo |
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| Sundew |
Posted on 30-07-2009 22:01
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Member Location: Berlin and Baden-Württemberg, Germany Posts: 3917 Joined: 28.07.07 |
I am afraid Berlin has no coastal dunes, dear Theo... But: I googled some interesting facts, however, without getting a solution. Thereva annulata is now Acrosathe annulata. In the Therevidae key by M. van Veen (http://home.hccne...vidae.html) this genus is described as having a hairy face and abdomen. On the website by W. Rutkies there are several photos of A. annulata that do not match my flies. However, a rather similar photo shows Psilocephala eximia (http://www.syrphi...%2003.html). This name is now seen as a synonym of Pandivirilia eximia, a species also known from Berlin. The trouble is that in van Veen's key Pandivirilia has entirely black femora. The description of Cliorismia "Femora black with yellow apex. Male: genitalia reddish. Female: tergites 5-6 with triangular silver markings" fits better. There were finds of C. ardea in the Berlin and Brandenburg region, but they date a half decade back. So can this puzzling nomenclatural problem ever be solved?
Edited by Sundew on 30-07-2009 22:43 |
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| Zeegers |
Posted on 02-08-2009 13:26
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Member Location: Soest, NL Posts: 19011 Joined: 21.07.04 |
Well, I noted the bare frons and indeed that bothered me. I have little experience with Psilocephala s.l. This is not Pandivirilia eximia. It might be ardea. Theo |
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