Thread subject: Diptera.info :: Thaumatomyia notata?

Posted by Juergen Peters on 09-09-2006 16:48
#1
Hello!

I still don't know, how to distinguish between Thaumatomyia notata and genus Chlorops on a photo. So, did I find a Thaumatomyia notata or a Chlorops here yesterday in our garden (Ostwestfalen/Germany)? Length about 2,5-3 mm. Thanks!
Edited by Juergen Peters on 09-09-2006 16:48

Posted by Tony Irwin on 09-09-2006 21:06
#2
Hi J?rgen
Thaumatomyia have a flat-topped scutellum with a clear margin and closely spaced apical bristles. Chlorops have a rounded scutellum. Although it's not very clear in your photo, I would say that these are Thaumatomyia.
Also, in my (limited) experience, Chlorops usually are found near their hostplants (grasses). Thaumatomyia, which feed on root aphids, are more likely to be found on general vegetation, especially in the autumn when they are preparing for hibernation.

Posted by Juergen Peters on 09-09-2006 22:40
#3
Hello, Tony!

Tony Irwin wrote:
Also, in my (limited) experience, Chlorops usually are found near their hostplants (grasses). Thaumatomyia, which feed on root aphids, are more likely to be found on general vegetation


Thanks! Then the flies I often find on umbelliferous flowers will also mostly be Thaumatomyia?!