Diptera.info :: Identification queries :: Diptera (adults)
Who is here? 1 guest(s)
 Chaetorellia acrolophi?
|
|
| Sundew |
Posted on 06-08-2009 22:34
|
 Member Location: Berlin and Baden-Württemberg, Germany Posts: 3890 Joined: 28.07.07 |
Hi, Yesterday I watched this little couple in an area very rich in Centaurea stoebe. C. jacea is much rarer. The flies showed no preference at that time, as they fed (at least the female) on Achillea millefolium. I know from Valery that it is difficult to discriminate between Ch. acrolophi and Ch. jaceae. How certain is Ch. acrolophi in this case? Many thanks, Sundew Sundew attached the following image:  [171.14Kb] |
|
|
|
| Sundew |
Posted on 06-08-2009 22:34
|
|
Member Location: Berlin and Baden-Württemberg, Germany Posts: 3890 Joined: 28.07.07 |
Two more pics.
Sundew attached the following image:  [171.84Kb] |
|
|
|
| Nosferatumyia |
Posted on 07-08-2009 07:30
|
 Member Location: Posts: 3405 Joined: 28.12.07 |
With certainty, I only could tell females of both species from measurements of the ovipositor blade (aculeus). However, there are some unexpressible differences in the wing crossbands (more or less oblique) showing that this is acrolophi, indeed. But since there was Acinia corniculata in the meadow, both acrolophi and jaceae might occur in there.
Edited by Nosferatumyia on 07-08-2009 07:31 Val |
|
|
|
| Jump to Forum: |
but don't see the image in the post.
