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 Themira male with peculiar rear abdomen
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| Sundew |
Posted on 24-08-2015 00:44
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 Member Location: Berlin and Baden-Württemberg, Germany Posts: 3890 Joined: 28.07.07 |
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 12:33 |
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| Sundew |
Posted on 24-08-2015 00:45
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Member Location: Berlin and Baden-Württemberg, Germany Posts: 3890 Joined: 28.07.07 |
And here it is viewed from behind:
Sundew attached the following image:  [149.58Kb] |
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| John Carr |
Posted on 24-08-2015 01:32
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 Member Location: Massachusetts, USA Posts: 9934 Joined: 22.10.10 |
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. |
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| Stephane Lebrun |
Posted on 24-08-2015 08:07
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 Member Location: Le Havre, France Posts: 8248 Joined: 03.03.07 |
Hi, this is a male Themira (Sepsidae).
Stephane. |
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| Sundew |
Posted on 24-08-2015 12:46
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Member Location: Berlin and Baden-Württemberg, Germany Posts: 3890 Joined: 28.07.07 |
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  .
Edited by Sundew on 24-08-2015 12:47 |
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