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Posted by Vladimir Davydov on 23-08-2009 19:31

23 august 2009 St-Petersburg.Olgino
It is Cheilosia rotundicornis?

Edited by Vladimir Davydov on 29-12-2011 22:43

Posted by Vladimir Davydov on 23-08-2009 19:31

Head

Posted by Andre on 24-08-2009 22:42

This is a difficult one. But one thing first: forget rotundicornis. Rotundicornis is a synonym of vernalis, as far as we know now.
Then... I think this might be Ch. uviformis or latifrons. But I am not sure enough, it's difficult based on pictures.

Posted by Vladimir Davydov on 25-08-2009 05:57

In previous thread you spoke C.rotundiventris=C.vernalis. Now C.rotundicornis=C.vernalis. It is true?:|

Posted by Andre on 25-08-2009 09:39

Damn, you are right! My mistake! I didn't read well, sorry, was reading 'ventris'!
Anyway.... I forgot that:
Rotundicornis = uviformis :)
It's a synonym never used anymore (the other former synonym for uviformis = argentifrons, :o).
But all in all, we can conclude that your ID seems correct, with the restriction mentioned in my earlier posting.
Must say, that you made some perfect pictures, amazing!

Posted by Vladimir Davydov on 25-08-2009 12:22

Many thanks Andre!:D

Posted by blowave on 28-12-2011 19:41

Forgive me for bringing this thread back up, I have keyed a female which I had as C. uviformis. I know I have this species although it's relatively new to the UK, a male I had this year was identified as 99% certain by Martin Speight.

The Mark van Veen keys do not point to this female as being C. uviformis. Firstly, it depends on whether the wings are infuscated along the mid cross veins. If they are, this leads to Cheilosia caerulescens. I'm not sure if the face protrudes forwards on this specimen.

Secondly, if the wings are not infuscated on the mid cross veins, and the face does not protrude forwards (this I find confusing but it appears to be the 'cheek'), the two options are whether or not the hind margin of the scutellum has bristles. I don't see bristles on this fly, this would lead to Cheilosia laticornis if the eye margin below the antennae has long white hairs.

If perchance it did have bristles on the hind margin of the scutellum (I can't see any) then it still does not appear to fit C. uviformis as the front and middle tarsus first segments should be pale.

Or am I missing something? :S If it does have bristles, the alternative to C. uviformis leads to C. pagana and C. hercyniae.

Janet

Edited by blowave on 28-12-2011 19:46

Posted by Vladimir Davydov on 28-12-2011 20:05

Thanks Janet ;)

Posted by Dieter on 29-12-2011 01:17

This is Cheilosia latifrons (bare eyes, face with short hairs, very wide eye rim).

Dieter

Posted by Vladimir Davydov on 29-12-2011 22:45

#10

Very similar on C. latifrons. Thanks Dieter

Edited by Vladimir Davydov on 29-12-2011 22:46