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Diptera.info :: Family forums :: Syrphidae
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Chalcosyrphus sp. => Chalcosyrphus valgus
Siegfried Rudolf
#1 Print Post
Posted on 17-08-2022 11:52
Member

Location: D / Staufen im Breisgau
Posts: 275
Joined: 23.03.21

Hello, everyone,

I photographed this hoverfly from the genus Chalcosyrphus on 08/07/22 in the Black Forest (Southwest Germany). I estimate the size at 15 mm. Unfortunately I only have bad pictures. Is it still possible to identify the species?

Greetings Siggi
Siegfried Rudolf attached the following image:


[154.41Kb]
Edited by Siegfried Rudolf on 17-08-2022 12:58
 
Siegfried Rudolf
#2 Print Post
Posted on 17-08-2022 11:53
Member

Location: D / Staufen im Breisgau
Posts: 275
Joined: 23.03.21

Picture 2
Siegfried Rudolf attached the following image:


[160.68Kb]
 
eklans
#3 Print Post
Posted on 17-08-2022 12:08
Member

Location: Franconia, Germany
Posts: 3341
Joined: 11.11.18

Hallo Siggi, it's a female Chalcosyrphus valgus, I think.
"apex of the hind tibia with a short, but distinct, keel postero-ventrally, terminating in a minute spike, which is
distinctly shorter than 1/4 the apical width of the hind tibia"(, rufipes without keel or spike).
StN KEYS FOR THE IDENTIFICATION OF ADULT EUROPEAN SYRPHIDAE (DIPTERA), GLASGOW 2011 (Speight & Sarthou)
Edited by eklans on 17-08-2022 12:16
Greetings, Eric Kloeckner
 
Siegfried Rudolf
#4 Print Post
Posted on 17-08-2022 12:57
Member

Location: D / Staufen im Breisgau
Posts: 275
Joined: 23.03.21

Hello Eric,
thank you for your determination and explanation. I am attaching another picture that shows the tibia better. You meant this spike, right?

Greetings Siggi
Siegfried Rudolf attached the following image:


[181.91Kb]
 
eklans
#5 Print Post
Posted on 17-08-2022 14:54
Member

Location: Franconia, Germany
Posts: 3341
Joined: 11.11.18

Yes, that's the spike! And I think we can see the yellow-brown arista instead of dark brown in rufipes as well as a yellow-brown stigma.
Greetings, Eric Kloeckner
 
Siegfried Rudolf
#6 Print Post
Posted on 17-08-2022 18:42
Member

Location: D / Staufen im Breisgau
Posts: 275
Joined: 23.03.21

great, then everything will be fine.

Thanks again,

Siggi
 
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