Flip-it Friday

An odonate exuvia was collected by Andy Davidson near Richmond, Virginia USA. Andy is a graduate student at Virginia Commonwealth University (VCU) working on a research project entitled “Predator-Prey Interactions in a Changing World.”

This individual is a member of Family Libellulidae (Skimmers), possibly a species from the genus Celithemis (Pennants). Source Credit: Steve Krotzer, Haysop Hill Photography; and Andy Davidson, VCU.

Dorsal view update

The first photograph is the same photo featured in a recent blog post, with one big difference. I flipped the image digitally so that the exuvia looks more like it’s in its natural resting position on the background. The more I looked at the original image, the more I felt somewhat disoriented. Ah, much better!

Ventral view

Next I flipped the specimen physically to show a ventral view of the exuvia. Look closely at the full-size version of the photo. This individual is probably a male, as indicated by what appear to be vestigial hamules located along the boundary between abdominal segments two and three (S2-3). Remember, all odonates have 10 abdominal segments, numbered from front-to-back. In my opinion, it’s easier to count segments from the posterior- to the anterior end of the body.

The following annotated images of other dragonfly exuviae might help you to recognize the vestigial hamuli on this specimen.

Related Resources

Tech Tips

The following equipment was used to shoot the macro photographs featured in this post: Fujifilm X-T1 digital camera; Fujifilm MCEX-11 extension tube; and Fujinon XF80mm macro lens minus the lens hood. The camera was set for both manual exposure and manual focus. That’s right, a switch on the camera body is used to set the type of focus. It’s a Fujifilm thing.

Godox X2TF radio flash trigger, mounted on the hotshoe of my X-T1, was used to control two off-camera external flash units set for radio slave mode.

  1. Godox TT685C Thinklite Flash for Canon Cameras (manual mode), fitted with a “Vello Bounce Dome (Diffuser) for Canon 580EX II Flash,” was used to light the underside of the translucent white plastic background; the top of the flash unit was ~30 cm from the bottom of the white plastic.
  2. Godox TT685F Thinklite Flash for Fujifilm Cameras (manual mode), fitted with a Lastolite Ezybox Speed-Lite 2 flash modifier, was used to light the subject from above.

Adobe Photoshop CC 2017 was used to spot heal and sharpen both images.

Copyright © 2019 Walter Sanford. All rights reserved.

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