Diptera.info :: Identification queries :: Diptera (adults)
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 Dolichopus griseipennis
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| jeremyr |
Posted on 11-03-2013 19:47
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 Member Location: Tottenham Posts: 577 Joined: 18.05.12 |
this fly from november appears to key to Dolichopus, then to clavipes, or, if the antenna can be considered short and black, to diadema. Does it look a possibility? Is there something in particular I should check to help navigate both the genus and species keys. Jeremy jeremyr attached the following image:  [85.34Kb] Edited by jeremyr on 12-03-2013 18:48 |
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| jeremyr |
Posted on 11-03-2013 19:48
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Member Location: Tottenham Posts: 577 Joined: 18.05.12 |
2nd image
jeremyr attached the following image:  [39.87Kb] |
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| jeremyr |
Posted on 11-03-2013 19:48
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Member Location: Tottenham Posts: 577 Joined: 18.05.12 |
wing
jeremyr attached the following image:  [42.36Kb] |
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| John Carr |
Posted on 11-03-2013 22:09
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 Member Location: Massachusetts, USA Posts: 9879 Joined: 22.10.10 |
Photos of Dolichopus clavipes show vein M slightly curved, not with two right angle bends and a stump vein. Possibly diadema. Your fly has the same M vein ("M1+2 with rudiment of M2" in Grichanov's key) and slightly swollen costa at R1. |
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| jeremyr |
Posted on 11-03-2013 22:34
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Member Location: Tottenham Posts: 577 Joined: 18.05.12 |
Thanks John. I wonder if this extra image helps. I had taken the 2nd option in the first couplet of the Dolichopus key, 'Facial clypeus at apex straight', though that face area is certainly concave - I'm not really sure what the clypeus is and I've not looked at one before, is it not that whiteish squareish section between the eyes, about two thirds of the way down, above the orange blob? It doesn't seem to be 'projecting below level of lower eye-margin'.. which is why I went for the other option Jeremy jeremyr attached the following image:  [157.27Kb] |
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| jeremyr |
Posted on 11-03-2013 22:35
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Member Location: Tottenham Posts: 577 Joined: 18.05.12 |
another image
jeremyr attached the following image:  [169.29Kb] |
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| jeremyr |
Posted on 11-03-2013 22:38
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Member Location: Tottenham Posts: 577 Joined: 18.05.12 |
antennae
jeremyr attached the following image:  [53.57Kb] |
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| jeremyr |
Posted on 11-03-2013 22:46
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Member Location: Tottenham Posts: 577 Joined: 18.05.12 |
the antennae do seem to match the illustration for diadema?
jeremyr attached the following image:  [31.37Kb] |
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| John Carr |
Posted on 11-03-2013 23:55
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Member Location: Massachusetts, USA Posts: 9879 Joined: 22.10.10 |
The antennae look typical for Dolichopus. Consider also D. griseipennis, which has only one bristle on the hind basitarsus. http://dolicho.na...ennis.html |
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| Igor Grichanov |
Posted on 12-03-2013 07:33
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 Member Location: St.Petersburg, Russia Posts: 1688 Joined: 17.08.06 |
Dolichopus griseipennis Stannius, 1831
Igor Grichanov |
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| jeremyr |
Posted on 12-03-2013 10:20
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Member Location: Tottenham Posts: 577 Joined: 18.05.12 |
starting with griseipennis and working backwards it keyed the whole way very smoothly, and I was able to see why I'd gone wrong previously. Thanks a lot John and Igor Falky mentions on DF that the combination of "hang vein on the discal vein plus long bristly hairs under the hind femorae" is unique to the British Dolichopus. Jeremy Edited by jeremyr on 12-03-2013 10:27 |
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but don't see the image in the post.
