Brown Spiketail dragonfly (female)

The following photo gallery shows a female Brown Spiketail dragonfly (Cordulegaster bilineata) spotted on 09 May 2013, perching near the ground in an open field along the trail to Hidden Pond, a small lake located at Meadowood Recreation Area in Fairfax County, Virginia USA.

Why are Spiketail dragonflies called “spiketails,” and what field markers can be used to identify this individual as a female? The answer to both questions is illustrated in the following annotated close-up photograph of the posterior end of the Brown Spiketail dragonfly’s abdomen.

Brown-Spiketail_f_anatomy

All female dragonflies have a pair of cerci (superior appendages) that have little or no function. Notice the spike-shaped subgenital plate.

Spiketail dragonflies are so named because the female’s long [subgenital plate], or egg-laying organ, extends beyond the tip of the abdomen. Source Credit: New York State Department of Environmental Conservation.

Thanks to Richard Orr, renowned expert on dragonflies and damselflies of the mid-Atlantic region, for verifying my tentative indentification of both the gender of the dragonfly and some of its anatomical parts.

Related Resources: Odonate Terminal Appendages.

Copyright © 2013 Walter Sanford. All rights reserved.

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4 Responses to “Brown Spiketail dragonfly (female)”

  1. Terminal appendages (male, female) | walter sanford's photoblog Says:

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  3. A sampler of male dragonfly claspers (Part 1) | walter sanford's photoblog Says:

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  4. A sampler of male dragonfly claspers (Part 2) | walter sanford's photoblog Says:

    […] Brown Spiketail dragonfly (female) […]

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