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 Chalcosyrphus sp. => Chalcosyrphus valgus
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| Siegfried Rudolf |
Posted on 17-08-2022 11:52
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Member Location: Posts: 79 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 |
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| Siegfried Rudolf |
Posted on 17-08-2022 11:53
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Member Location: Posts: 79 Joined: 23.03.21 |
Picture 2
Siegfried Rudolf attached the following image:  [160.68Kb] |
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| eklans |
Posted on 17-08-2022 12:08
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Member Location: Franconia, Germany Posts: 2749 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 |
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| Siegfried Rudolf |
Posted on 17-08-2022 12:57
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Member Location: Posts: 79 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] |
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| eklans |
Posted on 17-08-2022 14:54
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Member Location: Franconia, Germany Posts: 2749 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 |
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| Siegfried Rudolf |
Posted on 17-08-2022 18:42
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Member Location: Posts: 79 Joined: 23.03.21 |
great, then everything will be fine. Thanks again, Siggi |
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