MYN – Stygian Shadowdragon exuvia

A Stygian Shadowdragon dragonfly (Neurocordulia yamaskanensis) exuvia was collected by Freda van den Broek on 10 June 2019 along the St. Croix River in Interstate Park, Polk County, Wisconsin USA.

Stygian is the only species of Neurocordulia (Shadowdragons) within range of Wisconsin.

10 JUN 2019 | Polk County, WI | Stygian Shadowdragon (exuvia)

Notice the interesting crenulations on the labium (face mask) of the exuvia, including bundles of bristles (setae) along the margins of the palpal lobes.

Tech Tips

This subject was photographed against a pure white background (255, 255, 255) using the “Meet Your Neighbours” (MYN) technique.

I set the Laowa 25mm Ultra Macro lens for 2.5x magnification and an aperture of f/5.6, then took some test shots of the subject. Next I shot 23 photos for a focus-stacked composite image showing the face-head-dorsal view of this specimen.

Finally I shot a few photos at f/16, focused manually on the face mask. At the time of this writing, it was too late to create the focus stack so here’s one of the shots at f/16. An aperture of either f/5.6 or f/8 is the “sweet spot” for this lens, according to video reviews I watched. The net result — some image sharpness was sacrificed in favor of more depth of field.

Copyright © 2020 Walter Sanford. All rights reserved.

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