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Diptera.info :: Identification queries :: Diptera (adults)
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Meigenia?: parasitoid of chrysomelid larvae
Rui Andrade
#1 Print Post
Posted on 08-04-2009 21:55
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Location: Portugal
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On the last 20th of March I collected several chrysomelid larvae on Rumex sp. in a meadow. Five of these larvae were parasitized by tachinids. At first I thought that two tachinids species were present because there are specimens that look different, but now I think that it could be the same species and the difference lies on sexual dimorphism. What can be said about them?

location: Barcelos, Portugal

Male
hosting02.imagecross.com/image-hosting-08/2173mc1.jpgImage Hosting

Female
hosting02.imagecross.com/image-hosting-08/4340amc1.jpgImage Hosting

Pupa
hosting02.imagecross.com/image-hosting-08/1850mc3.jpgImage Hosting

Host larva
hosting02.imagecross.com/image-hosting-08/2849chry1.jpgImage Hosting

Adult host
hosting02.imagecross.com/image-hosting-08/7369chry2.jpgImage Hosting

Are the arrows pointing to the erect apical scutellar bristles?:
hosting02.imagecross.com/image-hosting-08/5513erectapicalscutellarbristles.jpgImage Hosting
 
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neprisikiski
#2 Print Post
Posted on 08-04-2009 22:39
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They are indeed Meigenia mutabilis-group, with five species known in Europe, identification of females is not possible. The group include such young species, that even molecular biology is not successful for identification using several genes, that usually work on other Tachinidae
Edited by neprisikiski on 08-04-2009 22:39
Erikas
 
Rui Andrade
#3 Print Post
Posted on 08-04-2009 23:07
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Thank you very much ErikasSmile! That's a really nice info you've got. I have read that tachinids are probably going through an adaptive radiation explosion.
 
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ChrisR
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Posted on 09-04-2009 08:50
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Great sequence of photos Rui - and good job rearing them out! Grin Females of your Meigenia spp. are more heavily dusted - in your photos you can see the narrow frons of the male and the wider frons of the female.
Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London.
 
http://tachinidae.org.uk
Zeegers
#5 Print Post
Posted on 09-04-2009 21:39
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Great work !
Don't despair, the males are rather easy on genitalia and you have a male !

Theo
 
Rui Andrade
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Posted on 10-04-2009 00:13
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Thanks Chris and Theo.Smile Recently I discovered that last year I've photographed one of the known hosts of Rondania dispar, the curculionid Brachyderes lusitanicus, in the same place where I've seen RondaniaSmile. I hope this year will be a good one in respect to rearing tachinids from their hosts. Unfortunately this winter the tachinid pupae I had didn't hatchSad.
 
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Zeegers
#7 Print Post
Posted on 10-04-2009 09:55
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Please keep all documentation and the specimens.
We might publish it in Tachinid Times.


Theo
 
Rui Andrade
#8 Print Post
Posted on 10-04-2009 23:46
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That would be greatGrin!
 
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Zeegers
#9 Print Post
Posted on 11-04-2009 20:53
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For that, I would need to check the genitalia.

in due time, there is no hurry.


THeo
 
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