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Diptera.info :: Identification queries :: Diptera (adults)
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Themira male with peculiar rear abdomen
Sundew
#1 Print Post
Posted on 23-08-2015 23:44
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Location: Berlin and Baden-Württemberg, Germany
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Hi,
Three weeks ago I saw a small black fly running on the wet algae washed ashore at the Baltic coast. I am sorry the pictures are bad quality, but I would like to show them nevertheless, because I have no idea where to place this fly. It has two strange "brushes" that meet at the abdomen tip, a structure I have not seen before. Help is greatly appreciated!
Thanks in advance, Sundew

This is the habitus:
Sundew attached the following image:


[184.16Kb]
Edited by Sundew on 24-08-2015 11:33
 
Sundew
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Posted on 23-08-2015 23:45
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And here it is viewed from behind:
Sundew attached the following image:


[149.58Kb]
 
John Carr
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Posted on 24-08-2015 00:32
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Scathophagidae and Sepsidae are the families that come to mind first, and it doesn't match any Scathophagidae in the British key. One Sepsidae in the gallery has tufts on tergite 4 but it isn't a European species.
 
http://www.flickr.com/photos/31715949@N00
Stephane Lebrun
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Posted on 24-08-2015 07:07
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Hi, this is a male Themira (Sepsidae).
Stephane.
 
Sundew
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Posted on 24-08-2015 11:46
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Many thanks, John and Stephane! Up to now I had known Themira females only, so this is a valuable enhancement of knowledge. I compared all species in the Sepsidnet (obviously, among other characters, shape and length of the brushes are decisive) and had also a look at the key by Pont & Meier (2002). Aside from the usual uncertainty there is a rather good conformity with T. putris (http://sepsidnet-...utris.html), so labeling the pictures "T. cf. putris" should not be too wrong Wink.
Edited by Sundew on 24-08-2015 11:47
 
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