widow skimmer

A female Widow Skimmer dragonfly at Prettyboy Reservoir, Baltimore County, Maryland, USA. © 2017 S. D. Stewart

Note: While I initially thought this was a female, widow skimmers are sexually dimorphic, meaning that even though the mature males and females look different, the immature males look similar to the females (this is also not uncommon in birds). A good way to separate the sexes is by their terminal appendages, as nicely illustrated in this post by Walter Sanford. The female has two, while the male has three. In order to determine this, one needs a clear close-up view. Unfortunately the resolution of my images is not quite high enough to determine the sex for certain. When I have the image magnified, it looks to me like there is possibly an epiproct present, but because of the angle of the shot I can’t be sure.

UPDATE: Walter Sanford stopped by and identified it as a female (see comments). Thanks, Walter!

Previous Post
Leave a comment


  1. Anonymous

     /  July 29, 2017

    Thanks for citing my blog! This individual is a female.

  2. This individual is a female. The “nubbin” at the tip of the abdomen is actually the S10, the last of 10 abdominal segments, rather than an epiproct.

  3. Walter reports that what I thought could have been an epiproct is more likely to be dragonfly excrement. He even has a pertinent photo for comparison on his excellent blog. Thanks again, Walter, for all your help here. Much appreciated.



Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.

  • Recent Posts

  • Navigation Station

    The links along the top of the page are rudimentary attempts at trail markers. Otherwise, see below for more search and browse options.

  • In Search of Lost Time

  • Personal Taxonomy

  • Common Ground

  • Resources


%d bloggers like this: