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Diptera.info :: Identification queries :: Diptera (adults)
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Heteromyza rotundicornis / commixta query
John Bratton
#1 Print Post
Posted on 23-02-2010 16:39
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Location: Menai Bridge, North Wales, UK
Posts: 642
Joined: 17.10.06

Collin's 1943 key says you can separate females of these species by the position of the front orbital bristles:
A line connecting front orbitals nearer to the front of the frons than to the front ocellus - rotundicornis Zett.

A line connecting front orbitals not nearer to the front of the frons than to the front ocellus - commixta Collin

Does this work, please? As the front of the frons is concave, did he mean the front in the mid-line or at the sides? In commixta, is the front orbital equidistant between frons and front ocellus, or nearer the ocellus?

Is there any other way of separating them? I find females more often than males.

Thanks in anticipation,
John Bratton
 
rvanderweele
#2 Print Post
Posted on 28-09-2010 22:08
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Location: Zoelmond, the Netherlands
Posts: 1984
Joined: 01.11.06

Interesting question from almost a year ago. According to Laszlo Papp the status of commixta is uncertain. He mentions that possibly commixta is a jun. syn. of rotundicornis. Does anybody knows what we know about this situation now?
ruud van der weele
rvanderweele@gmail.com
 
John Bratton
#3 Print Post
Posted on 05-10-2011 11:56
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Location: Menai Bridge, North Wales, UK
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I've even more belatedly just seen your reply. Thanks for this. As you say, it would be good to know the current situation. Is commixta Collin recorded outside of Britain?
 
Paul Beuk
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Posted on 05-10-2011 16:38
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Location: Netherlands
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Yes. See the link to the distribution on http://www.faunaeur.org/full_results.php?id=61778.
Paul

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