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Diptera.info :: Identification queries :: Diptera (adults)
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Pollenia - Pollenia cf. angustigena
Rosevinge15
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Posted on 22-03-2018 00:40
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Usually I avoid Pollenia (difficult), but I give this one a chance...


South East Norway
18.03.2018
In a garden

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Edited by Rosevinge15 on 22-03-2018 23:03
 
Rosevinge15
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Rosevinge15
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Posted on 22-03-2018 00:41
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Rosevinge15
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Rosevinge15
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johnes81
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Posted on 22-03-2018 16:03
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Hello Rosevinge, I hope that you are having a splendid day. Smile

this one is very difficult. I have spent an hour trying to analyze it. I think that this is clearly in the rudis group but it is not rudis. I think that it could be angustigena but there are some inconsistencies with this id. If you have a specimen, i can check the genitalia for you. I am more than happy to look at it for you. I don't think that you keep specimens but if you have it then you can send it to me.

one ad and two marginal scutellar bristles point to angustigena. the vestiture seems to match but i cannot tell if there really are golden hairs on f2 and f3. the posterior spiracle is somewhat visible and it reminds me of angustigena but i would need microscopic photos of this spiracle to be certain. Pollenia are extremely difficult at times even with genitalia. I once thought that i had angustigena even with genitalia but further analysis revealed it to be rudis. Very tricky.
John and Nini. Naturalists not experts.
 
Rosevinge15
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Posted on 22-03-2018 23:01
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Thank you very much for your reply! I appreciate your efforts to determine this fly. No, I do not have the fly anymore, but thanks for the offer to get it examined. Smile

Where I live there is still a lot of snow and unfortunately little flies to be found....
 
johnes81
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Posted on 23-03-2018 00:35
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my offer stands, so don't hesitate to request an id on a Pollenia. I spend alot of time identifying and studying Pollenia. I've learned alot from Dr. Rognes. I use his work and extra notes that he has kindly provided to me. The rudis group is the most difficult group to identify. I have no problems with male or female. All you have to do is send me a pm. I'm happy to help you with Pollenia.

the fly in this photo is very tricky. on one hand it resembles pediculata. on the other hand it fits angustigena. genitalia is best in such situations. I have to say that angustigena appears to be a better match but sometimes Pollenia defy the science.

anyway, stay warm and i wish for you to have a pleasant night.
Edited by johnes81 on 23-03-2018 00:38
John and Nini. Naturalists not experts.
 
Rosevinge15
#9 Print Post
Posted on 23-03-2018 22:32
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Thanks! Smile

Rosevinge
 
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