Diptera.info :: Identification queries :: Diptera (adults)
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 Phasia obesa?
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| kurt |
Posted on 18-07-2010 18:46
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Member Location: Posts: 4340 Joined: 27.11.08 |
This male was 3-4 mm and I think quite fresh. Could it be obesa or is it my usual aurulans? Photo from Ramsjö, Ångermanland, Sweden 62.53N 17.45 E 17 july 2010 Thanks for your help in advance Regards Kurt Holmqvist kurt attached the following image:  [93.05Kb] |
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| kurt |
Posted on 18-07-2010 18:46
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Member Location: Posts: 4340 Joined: 27.11.08 |
And last picture
kurt attached the following image:  [90.69Kb] |
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| Jaakko |
Posted on 18-07-2010 20:12
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 Member Location: Joensuu, Finland Posts: 479 Joined: 04.08.08 |
P. aurulans female. |
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| ChrisR |
Posted on 18-07-2010 20:35
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 Super Administrator Location: Reading, England Posts: 7706 Joined: 12.07.04 |
Hi Jaakko - can I ask how you are separating it from P.obesa? 
Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London. |
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| kurt |
Posted on 19-07-2010 20:53
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Member Location: Posts: 4340 Joined: 27.11.08 |
Thanks to Jaakko and Chris for looking at my both flies. I thought that markings on dorsum looked more like the ones on obesa and that it is a very fresh male? Kurt Holmqvist |
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| Jaakko |
Posted on 20-07-2010 11:16
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Member Location: Joensuu, Finland Posts: 479 Joined: 04.08.08 |
It is a female, these things are difficult to describe: obesa are not as robust and the head to shoulders ratio is different just by eyeballing... P. obesa male wings look different, also in the minute individuals. |
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| ChrisR |
Posted on 20-07-2010 11:57
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Super Administrator Location: Reading, England Posts: 7706 Joined: 12.07.04 |
Hmm, sounds a bit marginal without a lot of experience ... I probably need to see a lot more side by side to see the variation. I guess female obesa would just be smaller and less well marked while the males would have the classic wide, mottled wings. This has normal wings + heavy dusting ... and, like you say, it is a bit chubby.
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 21-07-2010 10:52
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Member Location: Soest, NL Posts: 19299 Joined: 21.07.04 |
the mouth margin is much more projecting in aurulans than in obesa, but this does not show in these pictures. I'd not dare to call this one, but I have little experience so I'm not questioning Jaakko. It seems aurulans goes up pretty far north. This is also true in the Nearctic. Theo |
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