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Diptera.info :: Identification queries :: Diptera (adults)
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Gymnosoma
Juergen Peters
#1 Print Post
Posted on 26-09-2006 17:56
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Location: northwest Germany
Posts: 14101
Joined: 11.09.04

Hello!

Does this pic show enough details to tell the species? Taken on Sep-24 in Ostwestfalen/Germany. Thanks in advance!
Juergen Peters attached the following image:


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Best regards,
Jürgen

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Juergen Peters
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Zeegers
#2 Print Post
Posted on 27-09-2006 20:58
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Location: Soest, NL
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Well, it's a male.
Either rotundatum or nudifrons, not sure


Theo
 
Stephen
#3 Print Post
Posted on 27-09-2006 21:34
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Location: West Virginia USA
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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
 
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Juergen Peters
#4 Print Post
Posted on 28-09-2006 00:33
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Location: northwest Germany
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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

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Zeegers
#5 Print Post
Posted on 28-09-2006 20:41
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Location: Soest, NL
Posts: 18948
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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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