[Odonata-l] zygopteran appendage shape

[doug@basiclink.com]

Kathy's latest book, pg. 105 my photo of Argia hinei has the male doing what Tim has asked in the below message.


Douglas Aguillard
San Diego, CA
doug at basiclink.com
http://sdbirds.basiclink.com
  ----- Original Message ----- 
  From: Ylightfoot at aol.com 
  To: odonata-l at listhost.ups.edu ; dennispaulson at comcast.net 
  Sent: Wednesday, December 06, 2006 4:12 PM
  Subject: Re: [Odonata-l] zygopteran appendage shape


  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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