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Diptera.info » Identification queries » Diptera (adults)
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Gymnosoma
Juergen Peters
Hello!

Does this pic show enough details to tell the species? Taken on Sep-24 in Ostwestfalen/Germany. Thanks in advance!
Best regards,
Jürgen

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Juergen Peters
Borgholzhausen, Germany
WWW: http://insektenfo...
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
 
http://insektenfotos.de/forum
Zeegers
Well, it's a male.
Either rotundatum or nudifrons, not sure


Theo
 
Stephen
Theo, how do you tell it is a male from the photo? The eyes would be smaller if it were a female?
--Stephen

Stephen Cresswell
www.americaninsects.net
 
www.americaninsects.net
Juergen Peters
Hello, Theo!

Either rotundatum or nudifrons, not sure


Thanks! Since weeks I'm trying to take good enough pics to make exactly that decision ;-). Would it be possible with a better photo?

Stephen wrote:
Theo, how do you tell it is a male from the photo? The eyes would be smaller if it were a female?


I don't know if it is a valid criterion, but every time when I was sure about the sex (when seeing a mating couple), the females turned out to have less distinctive spots on the abdomen. Not exactly round, more floating together:

insektenfotos.de/Gymnosoma%20nudifrons%20(Baumwanzenfliege),%20Weibchen_007.jpg
Best regards,
Jürgen

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Juergen Peters
Borgholzhausen, Germany
WWW: http://insektenfo...
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
 
http://insektenfotos.de/forum
Zeegers
Well the second one is a female.
Don't look at the abdomen, look at the thorax.
Thorax is strongly golden dusted in front of suture in male,
and (nearly) completely black in female.
Very simple (and only correct in genus Gymnosoma !!!)
Well illustrated by the two pictures


Theo
 
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12 July 2025 23:00
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