Diptera.info :: Identification queries :: Diptera (adults)
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 Paracraspedothrix sp.?
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| NakaRB |
Posted on 16-02-2010 20:39
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 Member Location: Moscow, Russia Posts: 3045 Joined: 25.11.08 |
Moscow region, 21.06.2009 Link Edited by NakaRB on 16-02-2010 21:08 |
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| Zeegers |
Posted on 16-02-2010 20:54
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Member Location: Soest, NL Posts: 18531 Joined: 21.07.04 |
Was it very small ? (3 mm) Paracraspedothrix comes in mind Theo |
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| NakaRB |
Posted on 16-02-2010 21:08
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Member Location: Moscow, Russia Posts: 3045 Joined: 25.11.08 |
Yes, if I am not mistaken the size is about 3..4 mm. Thanks! |
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| Stephen R |
Posted on 16-02-2010 22:04
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 Member Location: Clitheroe Lancashire UK Posts: 2396 Joined: 12.06.09 |
I have quite a few photos of P. montivaga from last summer, and I agree this looks similar; but I also see a few differences: a: in this fly the r-m crossvein seems to be at an oblique angle. In my photos it is short and straight across. b: There seems to be a prominent bristle at the costal break. I can't see this in my pictures, though there is a series of short bristles. c: In my photos the abdominal bristles are fewer and more regularly spaced (not more than 4 strong ones on T5, for example [EDIT: not true, Ive found one which shows more]), and the pale bands always seem to extend closer to the median line, often appearing continuous. The other thing I am suspicious of is the size - I have not managed to achieve such depth of field for a live 3mm fly in natural light. Maybe I'm just jealous : Another edit: Oh, I don't know, maybe this is all rubbish. Sorry I spoke 
Edited by Stephen R on 16-02-2010 22:42 |
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| Zeegers |
Posted on 17-02-2010 08:36
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Member Location: Soest, NL Posts: 18531 Joined: 21.07.04 |
It is always good to critically review suggestions, especially since mine was only a first impression. The point of the pale bands bothered me slightly, but I think the light is very insufficient to really be able to judge it. Your other points are a minor concern, in my opinion. As second glance, I still think it might be Paracras... Arguments pro It is a male (given the size of antenna) with broad vertex. Rather unusual The arista is thickened on basal half or more. The wing and bristles on scutellum suggest Blondeliini. Still, it is only a second guess and no ID Theo |
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| Stephen R |
Posted on 17-02-2010 11:27
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Member Location: Clitheroe Lancashire UK Posts: 2396 Joined: 12.06.09 |
Thanks Theo, I realised my doubts didn't add up to much! Stephen. |
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| Zeegers |
Posted on 17-02-2010 22:27
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Member Location: Soest, NL Posts: 18531 Joined: 21.07.04 |
I got my Ph.D. on this lemma 'Dubito, ergo sum' Only 20 years later I did learn that Augustinus beat me with 1600 years. So keep questioning the answers, if you please Theo |
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| Stephen R |
Posted on 17-02-2010 23:36
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Member Location: Clitheroe Lancashire UK Posts: 2396 Joined: 12.06.09 |
Thank you. I will continue to risk embarrassment! 'Da mihi dignitatem, sed noli modo.' It's a bit late to start worrying about chastity and continence  Stephen. |
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| ChrisR |
Posted on 18-02-2010 09:33
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 Administrator Location: Reading, England Posts: 7699 Joined: 12.07.04 |
I have found that the realization that one can never be 100% certain (about almost everything) is a very liberating thing  In addition the fact that we cannot be certain shouldn't prevent us working on stuff ... I have made a career of it!
Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London. |
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| Stephen R |
Posted on 19-02-2010 10:50
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Member Location: Clitheroe Lancashire UK Posts: 2396 Joined: 12.06.09 |
Could this also be Admontia? |
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| Zeegers |
Posted on 19-02-2010 17:22
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Member Location: Soest, NL Posts: 18531 Joined: 21.07.04 |
The though crossed my mind. It is NOT A. blanda, and if it was 3 mm., it can't be. But we know that estimates of length are very unreliable. On the other hand, relative to the leave, it seems very small. So, it might be Admontia, but it might be Paracras. as well, as far as I can see it now. Theo |
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| Stephen R |
Posted on 19-02-2010 18:03
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Member Location: Clitheroe Lancashire UK Posts: 2396 Joined: 12.06.09 |
OK thanks. Stephen. |
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