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Diptera.info :: Identification queries :: Diptera (adults)
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Tachinid of today 1: Gonia picea
Sundew
#1 Print Post
Posted on 15-03-2020 22:08
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Location: Berlin and Baden-Württemberg, Germany
Posts: 3890
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 Hi,
Today I saw three Tachinids in a flowering population of Draba verna (formerly Erophila verna), Brassicaceae. The location is in southwestern Germany, about 20 km west of Stuttgart.
The shown species should be Gonia picea as to early flight time and colour of the abdomen. Do you agree?
Thanks, Sundew
Sundew attached the following image:


[292.82Kb]
Edited by Sundew on 16-03-2020 17:34
 
Sundew
#2 Print Post
Posted on 15-03-2020 22:09
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 More pics.
Sundew attached the following image:


[277.17Kb]
 
Zeegers
#3 Print Post
Posted on 16-03-2020 11:27
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Location: Soest, NL
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 Yes.

Theo
 
Sundew
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Posted on 16-03-2020 17:37
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 A cool fly, nice to know it - thanks for confirmation! BTW: how can we tell apart the sexes? The "big feet = male" rule of thumb doesn't work here...
 
Sundew
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Posted on 16-03-2020 18:54
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 Meanwhile I found a paper by Zeller (1842) who states that the length ratio of the antennal segments 2 and 3 is decisive.
In males, the 3rd antennal segment is about four times as long as the second.
In females, the 2nd antennal segment is about half as long as the third.
If so, I have photographed a female.
 
Zeegers
#6 Print Post
Posted on 16-03-2020 19:08
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Location: Soest, NL
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 Yes, all is correct.

Theo
 
Sundew
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Posted on 16-03-2020 19:44
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Location: Berlin and Baden-Württemberg, Germany
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 Great - it is a delight to gather knowledge. Thanks again!
 
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