Diptera.info :: Identification queries :: Diptera (adults)
Who is here? 2 guest(s), John Carr
 Scatella ID
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| Carnifex |
Posted on 10-05-2026 20:56
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 Member Location: Vienna, Austria Posts: 2049 Joined: 23.06.15 |
lacustris or stagnalis? In Steyr (Upper Austria), late April  
Cheers, Lorin Font Color All requests are from the urban area of Vienna, if not otherwise stated. My Diptera observations (and other living forms) can be found here, and corrections or comments over there would also be appreciated. |
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| Tony Irwin |
Posted on 11-05-2026 10:12
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 Member Location: Norwich, England Posts: 7352 Joined: 19.11.04 |
This is lacustris. Scatella stagnalis is a brown species, and has a rounded white distal wingspot. Your specimen is greyer, and the distal wingspot is constricted in the middle.
Tony ---------- Tony Irwin |
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| Carnifex |
Posted on 11-05-2026 12:54
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Member Location: Vienna, Austria Posts: 2049 Joined: 23.06.15 |
It looked rather brown to me, thus I was unsure. Also, the dumbbell shape of the distal white spot I found not convincing, as I was imagining it could also be a combination of both wings, the underlying spot from the other wing shining through. Lastly, I am confused - according to GBIF, lacustris is a synonym of stagnalis - not of tenuicosta, as I was assuming. Cheers, Lorin Font Color All requests are from the urban area of Vienna, if not otherwise stated. My Diptera observations (and other living forms) can be found here, and corrections or comments over there would also be appreciated. |
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| Tony Irwin |
Posted on 11-05-2026 18:12
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Member Location: Norwich, England Posts: 7352 Joined: 19.11.04 |
The back lighting does make the fly look rather brown, but it is grey enough to be lacustris. The shape of the wingspot is large and oval in stagnalis, unlikely to form a dumbell shape when the wings are overlapped. The listing of lacustris as a synonym of stagnalis is wrong. If you read the abstract of the quoted paper (Zatwarnicki and Irwin 2018), it clearly states that tenuicosta is a synonym of lacustris. I don't know why the confusion has arisen, but thanks for pointing it out. Tony ---------- Tony Irwin |
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