Diptera.info :: Identification queries :: Diptera (adults)
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 I dare it again: Gymnosoma...
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| Juergen Peters |
Posted on 27-07-2007 20:00
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 Member Location: northwest Germany Posts: 13673 Joined: 11.09.04 |
Hello! Is it possible to tell the species (group)? Or at least, what species it can't be...?  Photo taken two days ago, Ostwestfalen/Germany. Thanks in advance!Larger picture: http://www.foto-u..._W_big.jpg Juergen Peters attached the following image:  [33.18Kb] Edited by Juergen Peters on 27-07-2007 20:01 Best regards, Jürgen -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Juergen Peters Borgholzhausen, Germany WWW: http://insektenfo... -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= |
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| ChrisR |
Posted on 27-07-2007 20:34
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 Administrator Location: Reading, England Posts: 7699 Joined: 12.07.04 |
I doubt it ... looks like a female Gymnosoma sp.  Would be easier with a specimen and I'd be happy to try to key anything if you could catch it and send it here  |
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| Juergen Peters |
Posted on 27-07-2007 21:09
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Member Location: northwest Germany Posts: 13673 Joined: 11.09.04 |
Hello, Chris! Chris Raper wrote: I doubt it ... looks like a female Gymnosoma sp. Thanks! I suspected it... Would be easier with a specimen and I'd be happy to try to key anything if you could catch it and send it here Many thanks for the offer, but for now I'm only photographing the insects without catching them. Best regards, Jürgen -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Juergen Peters Borgholzhausen, Germany WWW: http://insektenfo... -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= |
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| Zeegers |
Posted on 28-07-2007 09:26
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Member Location: Soest, NL Posts: 18539 Joined: 21.07.04 |
Well. little doubt this is a female G. rotundatum. Theo |
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| ChrisR |
Posted on 28-07-2007 11:24
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Administrator Location: Reading, England Posts: 7699 Joined: 12.07.04 |
Can you tell us why? Which features work as a 'rule of thumb'? |
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| Zeegers |
Posted on 28-07-2007 12:05
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Member Location: Soest, NL Posts: 18539 Joined: 21.07.04 |
-> No dusting on scutellum at all -> either rotundatum of nudifrons -> female -> black on parafrontals reachtin only to halfway antennal base -> no nudifrons thus rotundatum. Theo |
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| Juergen Peters |
Posted on 28-07-2007 14:46
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Member Location: northwest Germany Posts: 13673 Joined: 11.09.04 |
Hello, Theo! Zeegers wrote: -> No dusting on scutellum at all -> either rotundatum of nudifrons -> female -> black on parafrontals reachtin only to halfway antennal base -> no nudifrons thus rotundatum. Thanks a lot! That encourages me to furthermore try to make as detailed photos of the Gymnosomas here also in the future .
Best regards, Jürgen -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Juergen Peters Borgholzhausen, Germany WWW: http://insektenfo... -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= |
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| Zeegers |
Posted on 28-07-2007 14:53
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Member Location: Soest, NL Posts: 18539 Joined: 21.07.04 |
by the way: female sex is characterized by the black thoracic dorsum (without dusting). Theo |
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| Juergen Peters |
Posted on 28-07-2007 15:21
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Member Location: northwest Germany Posts: 13673 Joined: 11.09.04 |
Hello, Theo! Zeegers wrote: by the way: female sex is characterized by the black thoracic dorsum (without dusting). As a rule of thumb I had concluded from observations (seeing that in all mating couples) that the males are the ones with smaller, round, separate spots on the abdomen. (Pics below from same location and time as the above females.) http://insektenfo...ntid=20364 Juergen Peters attached the following image:  [32.21Kb] Best regards, Jürgen -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Juergen Peters Borgholzhausen, Germany WWW: http://insektenfo... -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= |
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| Zeegers |
Posted on 28-07-2007 15:44
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Member Location: Soest, NL Posts: 18539 Joined: 21.07.04 |
To illustrate my point -1) this is a male (size of spots less reliable) -2) def. NOT nudifrons/rotundatum, most likely dolycoridis Theo |
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| Juergen Peters |
Posted on 28-07-2007 16:25
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Member Location: northwest Germany Posts: 13673 Joined: 11.09.04 |
Hello, Theo! Zeegers wrote: To illustrate my point -1) this is a male (size of spots less reliable) But more easy to see even from a bigger distance ;-). -2) def. NOT nudifrons/rotundatum, most likely dolycoridis Interesting! Males of another species among the females of rotundatum on the same plant stock. Best regards, Jürgen -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Juergen Peters Borgholzhausen, Germany WWW: http://insektenfo... -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= |
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