[Odonata-l] zygopteran appendage shape

[William Hull]

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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