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 Phebellia sp. - tricky tachi...
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| Walther Gritsch |
Posted on 25-07-2010 23:29
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 Member Location: Copenhagen Posts: 298 Joined: 31.01.09 |
Hi Got this tachinid 25. vii 2010. It was swept from dense grass in a birch forest near Copenhagen. Body length some 9 mm. It keys out fairly easily to Phebellia but beyond that I'm lost. My first impression was something like Ph. stulta, which by the way is the only known Phebellia sp. in Denmark but the presence of small hairs on the parafacials should rule that species out. At least according to T&H. The closest I get to a decent result is Ph. villica but I'm sceptical to say the least... Any help is much appreciated. Any Phebellia seems to be a nice find - according again to the aforementioned gentlemen, who deem all species in the genus rare! I've made three shots  Regards, Walther Gritsch attached the following image:  [187.54Kb] Walther |
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| Walther Gritsch |
Posted on 25-07-2010 23:30
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Member Location: Copenhagen Posts: 298 Joined: 31.01.09 |
Head shot
Walther Gritsch attached the following image:  [181.67Kb] Walther |
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| Walther Gritsch |
Posted on 25-07-2010 23:30
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Member Location: Copenhagen Posts: 298 Joined: 31.01.09 |
Dorsal
Walther Gritsch attached the following image:  [165.54Kb] Walther |
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| mwkozlowski |
Posted on 26-07-2010 07:39
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 Member Location: Warsaw, Poland Posts: 797 Joined: 17.10.06 |
technical question only: have you made the fantastic head shot by multifocous compilation or by single shot?
Edited by mwkozlowski on 26-07-2010 07:39 very general entomologist |
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| Walther Gritsch |
Posted on 26-07-2010 11:52
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Member Location: Copenhagen Posts: 298 Joined: 31.01.09 |
Yes, head shot and full lateral view were made by stacking images in Helicon Focus. I use Canon 30D + 65 mm 1-5x. The picture of the head is made from 19 images over a distance of some 2.5 mm. In this case the lense was set at two times magnification. Regards, Walther |
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| mwkozlowski |
Posted on 26-07-2010 12:28
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Member Location: Warsaw, Poland Posts: 797 Joined: 17.10.06 |
thanks, canon macro 65 mm and multifocus is realy powerful!
very general entomologist |
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| ChrisR |
Posted on 26-07-2010 14:49
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 Super Administrator Location: Reading, England Posts: 7706 Joined: 12.07.04 |
Phebellia spp. are always tricky, I think ... I hardly ever see them, even through donations. Probably needs Theo's opinion - or a look under the microscope.
Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London. |
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| Jaakko |
Posted on 07-08-2010 22:52
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 Member Location: Joensuu, Finland Posts: 479 Joined: 04.08.08 |
Ph. stulta is a good candidate. This one is a female, males I´ve seen (initial ID by Theo) do not have discal bristles, which makes them difficult to place as Phebellia with T&H key. Ph. glauca very common in Finland, others seen seldom. |
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| jorgemotalmeida |
Posted on 08-08-2010 15:38
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 Member Location: Viseu - PORTUGAL Posts: 9296 Joined: 05.06.06 |
it is impossible to get perfect focus of all head with only one shot with mpe. Depth of field is extremely low. Only with Zerene (or other similar stacking program) and multishot it is possible to get photos like Walter did. only one shot to Voria ruralis (not perfect focus in all head,but almost)  and to Nowickia ferox.  you can check the gallery for other photos in tachinidae/tabanidae set. see www below. Edited by jorgemotalmeida on 08-08-2010 16:55 |
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| Zeegers |
Posted on 10-08-2010 20:22
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Member Location: Soest, NL Posts: 19299 Joined: 21.07.04 |
Phebellia is very tricky indeed and moreover, it is a female. I agree it could be Ph. glauca. Need to work on this one. Theo |
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