Diptera.info :: Identification queries :: Diptera (adults)
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 A small tachinid fly.
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| thijsdegraaf |
Posted on 17-09-2013 16:47
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Member Location: Bergen (NH) Posts: 817 Joined: 21.10.08 |
A tachinid fly. Small. I think about 5 mm. I hope you can help me. Bergen, The Netherlands. Photos 17-9-2013. Regards, Thijs thijsdegraaf attached the following image:  [63.23Kb] http://www.tuin-t...engels.htm |
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| thijsdegraaf |
Posted on 17-09-2013 16:47
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Member Location: Bergen (NH) Posts: 817 Joined: 21.10.08 |
second
thijsdegraaf attached the following image:  [60.62Kb] http://www.tuin-t...engels.htm |
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| thijsdegraaf |
Posted on 17-09-2013 16:48
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Member Location: Bergen (NH) Posts: 817 Joined: 21.10.08 |
3th
thijsdegraaf attached the following image:  [44.42Kb] http://www.tuin-t...engels.htm |
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| thijsdegraaf |
Posted on 17-09-2013 16:49
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Member Location: Bergen (NH) Posts: 817 Joined: 21.10.08 |
4th
thijsdegraaf attached the following image:  [56.82Kb] http://www.tuin-t...engels.htm |
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| thijsdegraaf |
Posted on 17-09-2013 16:49
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Member Location: Bergen (NH) Posts: 817 Joined: 21.10.08 |
last
thijsdegraaf attached the following image:  [64.83Kb] http://www.tuin-t...engels.htm |
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| Zeegers |
Posted on 17-09-2013 19:39
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Member Location: Soest, NL Posts: 18532 Joined: 21.07.04 |
Looks loke Bessa paralllela. Common in the dune area, host is Yponomeuta. |
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| thijsdegraaf |
Posted on 17-09-2013 20:25
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Member Location: Bergen (NH) Posts: 817 Joined: 21.10.08 |
Ah ... In October 2009 I had photographed a Bessa selecta. This is my second fly of this genus.  Thanks Theo. http://www.tuin-t...engels.htm |
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| sd |
Posted on 18-09-2013 10:29
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Member Location: Suffolk, UK Posts: 892 Joined: 11.10.07 |
Hi Theo, Are there no other means of distinguishing B. selecta and B. parallela other than presence of discals on T3, T4 ( selecta) and the host ( Symphyta for selecta, Microlepidoptera for parallela)? I have 2 specimens of Bessa from here in Suffolk. One is certainly selecta (http://www.dipter...d_id=40319 ) but the other has discals on T4 but not T3. (Sand Dunes are a few km away, so dune type diptera turn up from time to time, eg Villa modesta ). regards, Steve Edited by sd on 18-09-2013 10:29 |
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| thijsdegraaf |
Posted on 18-09-2013 16:31
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Member Location: Bergen (NH) Posts: 817 Joined: 21.10.08 |
Hi Steve. I've tried to find the topic about my Bessa selecta, but did not succeed. To long ago I think. You can find this fly on my website. (The eighth fly.) http://www.tuin-t...engels.htm It was determined by Jaakko When somebody asked why, was this his commen: Just a combination of features: sharp kink in the m-vein, white hairs behind the head, low "short-legged" sitting position and small size. I hope he was right, for the only difference i can find is indeed Terites 3 and 4 with discal bristles for selecta and Tergite 3 without, tergite 4 almost always without discal bristles for parallela. Regards, Thijs Edited by thijsdegraaf on 19-09-2013 07:17 http://www.tuin-t...engels.htm |
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| Zeegers |
Posted on 18-09-2013 16:48
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Member Location: Soest, NL Posts: 18532 Joined: 21.07.04 |
@Steve, No,there are only 2 features * host (Yponomeuta / other) * discal setae Indeed, 1 out of 100 is intermediate in discal setae. I always got away with this, because I had series of just 1 species. If it is only 1 specimen, you are in trouble ! [ I expect those to be selecta, but that is not very scientific !] Theo |
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| thijsdegraaf |
Posted on 18-09-2013 19:36
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Member Location: Bergen (NH) Posts: 817 Joined: 21.10.08 |
I think I change my website. I change the "Bessa selecta" for this Bessa paralllela. With a discription of both species. Thijs 
Edited by thijsdegraaf on 18-09-2013 19:37 http://www.tuin-t...engels.htm |
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| sd |
Posted on 18-09-2013 20:13
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Member Location: Suffolk, UK Posts: 892 Joined: 11.10.07 |
Hi, Thanks to both of you for helpful comments. I should also have noted that parallela is much rarer than selecta in the UK. regards, Steve |
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| thijsdegraaf |
Posted on 19-09-2013 07:57
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Member Location: Bergen (NH) Posts: 817 Joined: 21.10.08 |
I found the topic of the B. selecta in 2009. It's http://www.dipter...ost_114393
Edited by thijsdegraaf on 19-09-2013 07:58 http://www.tuin-t...engels.htm |
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