Diptera.info :: Identification queries :: Diptera (adults)
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 Tachinidae > Gymnosoma nudifrons
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| nick upton |
Posted on 07-06-2010 10:22
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Member Location: Wiltshire, UK Posts: 819 Joined: 12.03.10 |
Can anyone suggest an ID for this small Corsican Tachinid, Gymnosoma clavatum or rotundatum maybe? c 8mm 4th June 2010 on Umbel flowers, by mountain stream , 500m in Corsica nick upton attached the following image:  [130.76Kb] Edited by nick upton on 22-11-2010 21:06 Nick Upton - naturalist and photographer |
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| nick upton |
Posted on 07-06-2010 10:23
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Member Location: Wiltshire, UK Posts: 819 Joined: 12.03.10 |
A rear view
nick upton attached the following image:  [116.27Kb] Nick Upton - naturalist and photographer |
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| nick upton |
Posted on 07-06-2010 10:24
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Member Location: Wiltshire, UK Posts: 819 Joined: 12.03.10 |
Head-on shot
nick upton attached the following image:  [119.67Kb] Nick Upton - naturalist and photographer |
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| ChrisR |
Posted on 07-06-2010 11:45
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 Administrator Location: Reading, England Posts: 7699 Joined: 12.07.04 |
Hmm, it's going to need Theo because they really are very hard to ID - especially from photos. It's a male and it isn't nudifrons but other than that I'm not sure ... even with a specimen they are tricky 
Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London. |
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| nick upton |
Posted on 07-06-2010 19:37
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Member Location: Wiltshire, UK Posts: 819 Joined: 12.03.10 |
OK, many thanks Chris. I hope Theo can help get it closer to a species ID. I have more shots of this fly which might reveal crucial bristles etc once I know which angles of view help most!
Nick Upton - naturalist and photographer |
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| ChrisR |
Posted on 07-06-2010 21:16
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Administrator Location: Reading, England Posts: 7699 Joined: 12.07.04 |
With male Gymnosoma it's the genitalia (hard to see at the best of times) and the dusting on the face and dorsal surface of the thorax
Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London. |
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| nick upton |
Posted on 07-06-2010 23:08
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Member Location: Wiltshire, UK Posts: 819 Joined: 12.03.10 |
That's going to be tough... but will check what else I have in case it helps..
Nick Upton - naturalist and photographer |
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| ChrisR |
Posted on 08-06-2010 00:00
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Administrator Location: Reading, England Posts: 7699 Joined: 12.07.04 |
Haha - not half as tough as identifying the darn things  I occasionally get easy ones but with most I sit here for ages scratching my head and wondering if the dusting really is broad behind the suture ... or whether the hairs on the thorax are erect or recumbent ... they really are horrible
Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London. |
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| nick upton |
Posted on 08-06-2010 11:15
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Member Location: Wiltshire, UK Posts: 819 Joined: 12.03.10 |
I know you love it really.... To add to the horrible challenge, here are the only extra pics that might help. No revealing gentalia images, tho - these were well hidden a t all times, but maybe some clearer images for the head/thorax.
nick upton attached the following image:  [121.68Kb] Nick Upton - naturalist and photographer |
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| nick upton |
Posted on 08-06-2010 11:16
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Member Location: Wiltshire, UK Posts: 819 Joined: 12.03.10 |
more side on
nick upton attached the following image:  [147.38Kb] Nick Upton - naturalist and photographer |
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| nick upton |
Posted on 08-06-2010 11:18
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Member Location: Wiltshire, UK Posts: 819 Joined: 12.03.10 |
Final image. The only other thing I could do is to crop images to give closer views of key areas if needed.
nick upton attached the following image:  [140.59Kb] Edited by nick upton on 08-06-2010 11:19 Nick Upton - naturalist and photographer |
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| ChrisR |
Posted on 08-06-2010 12:06
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Administrator Location: Reading, England Posts: 7699 Joined: 12.07.04 |
Yeah, they've very lovely but I could only really guess at Gymnosoma rotundatum or costatum ... and that's just an educated guess so we need Theo 
Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London. |
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| nick upton |
Posted on 08-06-2010 16:35
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Member Location: Wiltshire, UK Posts: 819 Joined: 12.03.10 |
OK, let's hope Theo can take a look and give the definitive ID (without a specimen of course...).
Nick Upton - naturalist and photographer |
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| nick upton |
Posted on 22-11-2010 15:04
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Member Location: Wiltshire, UK Posts: 819 Joined: 12.03.10 |
I know these are next to impossible to be sure of from even clear photos from many angles, but can anyone go further than ChrisR of the ID for this? Is Theo out there?!
Nick Upton - naturalist and photographer |
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| Zeegers |
Posted on 22-11-2010 17:22
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Member Location: Soest, NL Posts: 18785 Joined: 21.07.04 |
Why not nudifrons ? It is a male Gymnosoma, so with all standard disclaimers, looks like nudifrons to me. Theo |
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| ChrisR |
Posted on 22-11-2010 18:44
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Administrator Location: Reading, England Posts: 7699 Joined: 12.07.04 |
Ahh, yeah I forgot that the undusted parafrontals is only a female character ... but I still don't think that I would have had the confidence to say it was G.nudifrons
Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London. |
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| nick upton |
Posted on 22-11-2010 19:05
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Member Location: Wiltshire, UK Posts: 819 Joined: 12.03.10 |
Many thanks Theo and Chris. As always I'm happy to go along with what I'm told by them that knows, and seems you were right Chris, to say we needed Theo's help on this. I may dig out a couple of other Corsican Tachinid IDs you got close on but not all the way.
Nick Upton - naturalist and photographer |
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