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| 1 | 2 |  » Stats |
Members: 50,153
Threads: 82,342
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Top Poster: glsammy (15,069)
| | Welcome to our newest member, Xalrahc | |  | 
28-07-2010, 01:52 PM
|  | Commander of the Wild Empire | | Join Date: Jun 2006 Location: Wolverhampton, West Midlands
Posts: 2,149
| | | Hoverfly ID
Hello all - I'm going to have a stab at this myself – Syrphus vitripennis – and then wait for someone to come along and point out to me the error of my ways!   |
28-07-2010, 02:37 PM
|  | Commander of the Wild Empire | | Join Date: Nov 2008 Location: Lincoln
Posts: 4,826
| | | Re: Hoverfly ID
Well, I can see some hairs on the eyes, so it could be S. torvus!
Janet 
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28-07-2010, 02:43 PM
| | Commander of the Wild Empire | | Join Date: Jun 2006 Location: Wolverhampton, West Midlands
Posts: 2,149
| | | Re: Hoverfly ID
Quote:
Originally Posted by JRsbugs  Well, I can see some hairs on the eyes, so it could be S. torvus!
Janet | It had to be you ... as the song goes ...  |
28-07-2010, 03:14 PM
|  | Knight Grand Cross of the Wild Empire | | Join Date: Jul 2007 Location: London
Posts: 11,830
| | | Re: Hoverfly ID
Afternoon Jez,
Yes, well-spotted Janet.
As a note on vitripennis - yes, the half-3/4 dark hind femora is a clue - but the clincher is the sparse microtrichae in the basal cells - a microscope job. With this it is confirmed, otherwise it is just a possible ID.
As for the likelyhood of this individual - males of S. ribesii have the dark area too, as does torvus and presumably vitripennis and so field-photos of male Syrphus that aren't of a high resolution ( for eye hair-checks) would have to stay as Syrphus sp., quite frustratingly! It's the females you need to look for for field-' possibilities', as I believe males would need microscopic analysis to check for vitripennis ( though in this case the eye hairs point more likely towards torvus as Janet says).
Take care, Jason 
Last edited by Jason Green; 28-07-2010 at 03:17 PM.
|
28-07-2010, 03:31 PM
| | Commander of the Wild Empire | | Join Date: Jun 2006 Location: Wolverhampton, West Midlands
Posts: 2,149
| | | Re: Hoverfly ID
Quote:
Originally Posted by Jason Green Afternoon Jez,
Yes, well-spotted Janet.
As a note on vitripennis - yes, the half-3/4 dark hind femora is a clue - but the clincher is the sparse microtrichae in the basal cells - a microscope job. With this it is confirmed, otherwise it is just a possible ID.
As for the likelyhood of this individual - males of S. ribesii have the dark area too, as does torvus and presumably vitripennis and so field-photos of male Syrphus that aren't of a high resolution ( for eye hair-checks) would have to stay as Syrphus sp., quite frustratingly! It's the females you need to look for for field-' possibilities', as I believe males would need microscopic analysis to check for vitripennis ( though in this case the eye hairs point more likely towards torvus as Janet says).
Take care, Jason |
I stand corrected ... well, actually, I SIT corrected, if we're splitting hairs ... | | |
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