Diptera.info :: Identification queries :: Diptera (adults)
 Gymnocheta magna
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| Jaakko |
Posted on 06-04-2010 08:15
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 Member Location: Joensuu, Finland Posts: 479 Joined: 04.08.08 |
Hi, As Gymnocheta viridis might already be in flight in Central Europe, I'll post this one as a reminder. G. magna is a bit later species, however at least in Finland the flight-times of the two overlap. Latest viridis in my collection is from July 12! The female magna specimen here is ~12 mm, so as big as the biggest viridis. The mouth edge is a good feature distinguishing the two! Best, Jaakko Jaakko attached the following image:  [41.08Kb] |
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| Jaakko |
Posted on 06-04-2010 08:16
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Member Location: Joensuu, Finland Posts: 479 Joined: 04.08.08 |
A close-up on the head profile. Finland, Om: Raahe, Hakotauri, July 3, 2006. K. Varpenius leg. Jaakko attached the following image:  [13.26Kb] |
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| Jaakko |
Posted on 06-04-2010 08:17
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Member Location: Joensuu, Finland Posts: 479 Joined: 04.08.08 |
And a G. viridis female head profile for a comparison.
Jaakko attached the following image:  [20.03Kb] |
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| ChrisR |
Posted on 06-04-2010 09:25
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 Super Administrator Location: Reading, England Posts: 7706 Joined: 12.07.04 |
Thanks - I have never seen G.magna - nice to know what it looks like 
Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London. |
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| Zeegers |
Posted on 06-04-2010 20:20
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Member Location: Soest, NL Posts: 19261 Joined: 21.07.04 |
Magna is in Central Europe really much later, end of May. Very extremely rare in peat bogs. So any Gymnochaeta on a tree stem in a forest in April will be viridis without any doubt (but this can be falsified). Theo |
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| Jaakko |
Posted on 08-04-2010 08:00
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Member Location: Joensuu, Finland Posts: 479 Joined: 04.08.08 |
Hi, My impression is that this magna was collected from a suburban park-like seashore (sparse trees, meadows..). I'll find out more soon. In Finland viridis is commonly seen also on peat bogs and mires, usually in more nutritious parts of the bog with higher vegetation. In these biotopes they also occur fairly late in the season (until July) and some specimens are quite dark. I have sent examples to Christer Bergström and Joachim Ziegler but they also find these otherwise not differing from "regular" viridis. Quite irritating! I've decided to collect all late-season Gymnochetas to be sure... |
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