Diptera.info :: Identification queries :: Diptera (adults)
 Variation in Gymnosoma
|
|
| Cor Zonneveld |
Posted on 29-03-2009 13:49
|
 Member Location: Amstelveen, the Netherlands Posts: 840 Joined: 14.10.06 |
Here are three photos of Gymnosoma, all from Holland. When I looked at the first shown here, I saw a rather short stalk on the top cell. Moreover, the wings are a bit clouded. These features are different in the other photos. Is this normal variation, or did I overlook something? First photo: Drents-Friese Woud, 2 August 2008. Boundary between mixed wood and meadow. Cor Zonneveld attached the following image:  [129.38Kb] Thanks for your attention Cor Zonneveld |
 |
|
| Cor Zonneveld |
Posted on 29-03-2009 13:50
|
|
Member Location: Amstelveen, the Netherlands Posts: 840 Joined: 14.10.06 |
This one is from het Gooi, the Netherlands, 25 April 2007. Long stalk on top cell, no cloud on wing.
Cor Zonneveld attached the following image:  [98.77Kb] Thanks for your attention Cor Zonneveld |
|
|
|
| Cor Zonneveld |
Posted on 29-03-2009 13:52
|
|
Member Location: Amstelveen, the Netherlands Posts: 840 Joined: 14.10.06 |
and yet another one. Noord-Limburg, the Netherlands; 9 June 2007.
Cor Zonneveld attached the following image:  [184.28Kb] Thanks for your attention Cor Zonneveld |
|
|
|
| Zeegers |
Posted on 29-03-2009 14:33
|
|
Member Location: Soest, NL Posts: 19143 Joined: 21.07.04 |
Interesting. The second looks like clavatum (note the formulation: looks like) and the third one might be clavatum as well. Need to study this. Theo |
|
|
|
| ChrisR |
Posted on 29-03-2009 15:08
|
 Super Administrator Location: Reading, England Posts: 7703 Joined: 12.07.04 |
Cor Zonneveld wrote: Here are three photos of Gymnosoma, all from Holland. When I looked at the first shown here, I saw a rather short stalk on the top cell. Moreover, the wings are a bit clouded. These features are different in the other photos. Is this normal variation, or did I overlook something? I think you just highlighted the main problem with the genus - they are all very variable and no one feature is 100% reliable for each species. Sure females have more black on the abdomen but dusting is very variable always ... only some individuals will fit the keys perfectly  |
|
|
|
| Jump to Forum: |
