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Diptera.info :: Identification queries :: Diptera (adults)
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Fly with long legs, spotted wings in forest => Sylvicola sp.
AdrianBothe
#1 Print Post
Posted on 24-02-2022 13:48
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Location: Berlin
Posts: 236
Joined: 19.06.18

Dear all,
on 29.12.2020 I found this fly on a Fagus sylvatica tree during the night in a forest in Berlin (Germany). Which species is this?
Best, Adrian
AdrianBothe attached the following image:


[153.5Kb]
Edited by AdrianBothe on 24-02-2022 16:21
 
Roger Thomason
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Posted on 24-02-2022 14:58
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Location: Mossbank,Shetland Isles.
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Sylvicola sp. Anisopodidae
 
AdrianBothe
#3 Print Post
Posted on 24-02-2022 17:29
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Location: Berlin
Posts: 236
Joined: 19.06.18

Thank you very much!
I have had a look into the key from this source https://www.zobod...1-0217.pdf.
Since M1/M2 veins do not converge in a single point, I conclude sugenus Sylvicola.
Then I am a bit unsure, since I would say there is a yellowish spot in the center of r1 cell, however my fly has dark spots central on veins M1 and M2 don't seem to be present in S. (S.) limpidus, therefore I go to point (6). Perhaps the yellow spots were brownish in the samples that the key was based upon. But it definitely makes sense to choose "many distinct and indistinct dark and light spots".
Next, I exclude S. (S.) suzukii, since the halteres have yellowish knobs on my picture, and the wings aren't dark enough. -> (7)
Remaining are S. (S.) zetterstedi, cinctus, fenestralis, japonicus, matsumurai, of which the latter two don't occur in Germany. Also, the apical spot has quite clear borders and seems triangular, which fits. -> (8)
S. (S.) zetterstedi has a different shape of the apical dark patch, therefore I'm left with S. (S.) cinctus / fenestralis. And that's it, I gues..
 
libor
#4 Print Post
Posted on 24-02-2022 21:56
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Location: western Bohemia
Posts: 1223
Joined: 30.05.09

The identifiction of Sylvicola according to wing pattern is almost impossible. Limpidus is a species of very high mountain, so you can exclude it. For all other three species, cinctus/fenestralis/zetterstedti is the only way - using diagnostics on genitalia.
Libor
 
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