Acceptable uncertainty

An unknown species of damselfly from the Family Coenagrionidae (Narrow-winged Damselflies) was spotted at the stormwater management pond located at Mason Neck West Park. This individual is a female, as indicated by her terminal appendages.

I thought the damselfly might be a mature female Rambur’s Forktail damselfly (Ischnura ramburii), based upon the fact that I’d seen an immature female Rambur’s Forktail on 03 October 2016 at the same location. I consulted the experts of the Northeast Odonata Facebook group for verification of my tentative identification.

It’s a female bluet, probably Familiar [Bluet] but it has a hint of a carina, so it might be Big [Bluet], but the eyespots look more like Familiar. Female Rambur’s does not have shoulder stripes. Source Credit: Dr. Michael Moore. Michael is an active contributor to the Dragonfly and Damselfly Field Guide and ID App.

Difficult though it may be for me to accept, sometimes it’s impossible to identify odonates with certainty based upon a single photograph. This is especially true for many species of female damselflies.

Copyright © 2017 Walter Sanford. All rights reserved.

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3 Responses to “Acceptable uncertainty”

  1. Mike Powell Says:

    When it comes to damselflies, I am almost always uncertain with my identifications–so many of them are at least superficially similar.

  2. , ? | walter sanford's photoblog Says:

    […] I’m guessing you might be asking yourself, “What’s up with the title of this blog post?” It must be either a typo or mistake, right? No, it’s another case of acceptable uncertainty. […]

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