[Odonata-l] Clubtail ID help - large picture size

[Nick and Ailsa Donnelly]

It looks most like Gomphus crassus.  The subgenital plate and top of head
details would confirm (yes or no) this guess.  There is no scale.  Gomphus
lineatifrons is similar but with wider pale stripes on the thorax.  It would
be nice to see the specimen because this might have been a pretty cool
record.  Color patterns vary more than most people realize.  Gomphus vastus
would have a prominent black stripe on the face (smaller in lineatifrons).
Gomphus fraternus has a different thoracic pattern, but this species (the
most likely based merely on range) exhibits highly variable thoracic
patterns.

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From: odonata-l-bounces at listhost.ups.edu
[mailto:odonata-l-bounces at listhost.ups.edu] On Behalf Of Tommy Springer
Sent: Thursday, December 13, 2007 10:57 PM
To: odonata-l at listhost.ups.edu
Subject: [Odonata-l] Clubtail ID help - large picture size


I am having some problems identifying this clubtail species.  I have
narrowed my guesses down to a couple species, but I will not mention them so
as not to bias anyone else's opinion.  I apologize for the large file size
of the pictures, but I didn't want to sacrifice the quality of the images in
case anyone wanted to zoom in on any certain feature.
 
This specimen was captured June 11, 2007 on Big Darby Creek in Prairie Oaks
Metro Park, Franklin County, Ohio.  It was subsequently released after the
photographs were taken, so unfortunately they are all I have to go by.  Any
help on this specimen would be greatly appreciated, if not for any other
reason that to expand my own cranial database.
 
Noted behavior: This dragonfly made intermittent passes along a
boulder-strewn run above a riffle, and would pause occasionally, hovering
about 2-3' above the water.
 
Thanks again for any help,
 
Tom Springer
 
 


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