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 Strange Geomyza tripunctata? --> G. tripunctata or G. nartshukae
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| fatsemann |
Posted on 18-07-2020 21:36
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Member Location: Posts: 165 Joined: 09.10.17 |
Hello, this fly reminds me of Geomyza tripunctata. I only know G. tripunctata with a gray-black thorax, but this is red-brown. Is it G. tripunctata or another species? Date: Jul 17, 2020 Location: Germany, NRW, 47608 Geldern Size: body 4 mm, with wings 4.8 mm Best regards Bernd fatsemann attached the following image:  [65.15Kb] Edited by fatsemann on 27-09-2020 06:38 |
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| fatsemann |
Posted on 18-07-2020 21:36
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Member Location: Posts: 165 Joined: 09.10.17 |
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fatsemann attached the following image:  [61.77Kb] |
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| Sundew |
Posted on 18-07-2020 23:07
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 Member Location: Berlin and Baden-Württemberg, Germany Posts: 3916 Joined: 28.07.07 |
This is probably Geomyza hackmani (see https://diptera.i...d_id=14622 for more information). It seems to be a male, so the shape of the genitalia would allow for an unambiguous differentiation from G. balachowskyi. Regards, Sundew Edited by Sundew on 18-07-2020 23:25 |
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| Nacho Cabellos |
Posted on 19-07-2020 11:41
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 Member Location: Spain Posts: 1312 Joined: 27.09.09 |
Hello. I'm not an expert but I think it`s G. tripunctata. The spot near to R1 is a characteristic this species shares with G.nartshukae, but i thik that it lacks in hackmani or balachowski. As to thorax colour, it's very variable, i think. |
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| Sundew |
Posted on 19-07-2020 13:20
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Member Location: Berlin and Baden-Württemberg, Germany Posts: 3916 Joined: 28.07.07 |
So we urgently need the opinion of our expert Jan Willem! I am aware that there are some strangely strong spots, but I cannot remember a case when a specimen with a brown thorax was identified as G. tripunctata... On the other hand, Malcolm Storey gives a picture of just such an animal: https://www.disco...mp;res=640. That is exciting - now I really would like to know, too! |
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| fatsemann |
Posted on 19-07-2020 22:20
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Member Location: Posts: 165 Joined: 09.10.17 |
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fatsemann attached the following image:  [71.58Kb] |
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| Jan Willem |
Posted on 20-07-2020 19:38
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 Member Location: Waalwijk, The Netherlands Posts: 2137 Joined: 24.07.04 |
This is a male of either G. tripunctata or G. nartshukae. The reddish thorax would point to the latter, but unfortunately the coloration of the thorax is very variable in the G. tripunctata. It seems like especially in Southern Europe, the thorax tends to be more reddish brown, but I see more and more specimens from the Netherlands which also have a rather reddish brown thorax. To be sure the genitalia should be studied.
Jan Willem van Zuijlen |
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