[Community] Orthetrum brunneum: unusual wings veins pattern

[Dijkstra, K.D.B.]

Hi Renaud,
 
With your two examples (also elegans) you've mentioned the two most variable features in Odonata, venation and blackness. Both variations are quite normal in many species. People often don't realise how variable dragonflies are!
 
Cheers, KD
 
Klaas-Douwe 'KD' B. Dijkstra
National Museum of Natural History Naturalis
PO Box 9517, 2300 RA Leiden, The Netherlands
dijkstra at naturalis.nl
http://science.naturalis.nl/dijkstra
http://www.flickr.com/photos/kiskadee
 
Int. J. Odonatology is now ISI listed!
http://ijo.tu-bs.de/home.html

 

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From: community-bounces at asia-dragonfly.net on behalf of bernhard_renaud at bluewin.ch
Sent: Sun 12/6/2009 12:41 PM
To: Community at asia-dragonfly.net
Subject: [SPAM] - [Community] Orthetrum brunneum: unusual wings veins pattern - Email found in subject



Good morning,

I'm used to hear and notice that one easy way to tell O. brunneum from O. coerulescens is the number of cells' rows
between IR3 and Rspl, beeing that brunneum have double rows on at least 4 cells there and coerulescens have less, if
any.

I have shot that Orthetrum brunneum (pic 7329 on www.asia-dragonfly.net near Geneva, Switzerland in August this year.
It doesn't have any doubled rows on any wings. There is one supplementary cells on both left wings but even so that's
more forked cross veins than double row.

Is it just an odd bird or are O. brunneum with no (or at least less then four) double rows rather frequent?



Have a nice day,

Renaud BERNHARD,

Switzerland

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