[Odonata-l] zygopteran appendage shape

[Thomas Schultz]

Hi all,

If you go to the website below and search for signatum in the box at  
the upper right, you'll see male Orange Bluets in sentinel position,  
with wings flapping, and descending into the water while in tandem  
with a submerged female.

http://content.denison.edu/cdm4/browse.php

Tom


Tom D. Schultz, Ph.D.
Tight Distinguished Professor
in the Natural Sciences
Department of Biology
Denison University
Granville, OH 43023
740-587-6218


On Dec 7, 2006, at 3:46 PM, William Hull wrote:

> This E. civile pair is the photo that sparked the exchange between
> Dennis and myself.  The male is upright and, although I did not note
> it at the time, there appears to be no wing motion.
>
> http://www.mangoverde.com/dragonflies/images/00000000458.jpg
> -- 
> Cheers,
> Bill Hull
> Cincinnati, OH, USA
> http://www.mangoverde.com/
>
> On 12/6/06, Ylightfoot at aol.com <Ylightfoot at aol.com> wrote:
>>
>>
>>
>> In a message dated 12/6/2006 1:47:13 PM Pacific Standard Time,
>> dennispaulson at comcast.net writes:
>> Species of Argia oviposit mostly in the open, often in current and  
>> where
>> there would be nothing for the male to grasp. Enallagma much more  
>> often
>> oviposit on emergent vegetation or floating vegetation in still  
>> water where
>> the male can rest at water level.
>> Hi Dennis:
>>
>> Interesting topic.  I have some video footage of Enallagma civile
>> ovipositing in tandem, and the male is upright and not holding on to
>> anything, but as I recall, he is flapping his wings like crazy.   
>> It seems to
>> me Argia males are able to remain attached upright with their  
>> wings still,
>> no?  In the instance of E. civile oviposition above I believe the  
>> pair were
>> ovipositing on the undersurfaces of small floating leaf clusters  
>> in a creek,
>> so habitat might have been involved.  Would be interesting to note  
>> if others
>> report Argia males standing erect with wings still versus  
>> Enallagma males
>> standing erect (when they do so) with wings moving, while  
>> ovipositing in
>> tandem.
>>
>> Argia also have tori on the dorsoapical margin of segment 10 which  
>> may serve
>> as extra "padding" or support for maintaining a still, vertical  
>> position
>> while attached to the ovipositing female.
>>
>> Cheers,
>>
>> Tim
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>>
>>
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