[Odonata-l] zygopteran appendage shape

[Cannings, Rob RBCM:EX]

Hi All: Another genus that oviposits in this manner is Nehalennia. At
least N. irene does. 
 
Rob
 
Dr. Robert A. Cannings

Curator of Entomology

Royal British Columbia Museum

675 Belleville Street

Victoria, BC, Canada   V8W 9W2

Phone: (250) 356-8242. Fax: (250) 356-8197

E-mail: rcannings at royalbcmuseum.bc.ca


  _____  

From: odonata-l-bounces at listhost.ups.edu
[mailto:odonata-l-bounces at listhost.ups.edu] On Behalf Of Thomas Schultz
Sent: Thursday, December 07, 2006 4:30 PM
To: William Hull
Cc: odonata-l at listhost.ups.edu
Subject: Re: [Odonata-l] zygopteran appendage shape


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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