Common Whitetail dragonflies (Plathemis lydia) are probably the most common dragonflies in my area. They are among the first species to appear in the spring and among the last to be seen in the autumn and can be found in a variety of habitats. I photographed my first Common Whitetails of the season last week at Accotink Bay National Wildlife Refuge.
When they are adults, it is easy to distinguish the male Common Whitetails from the females—the males have white-blue abdomens and the females have brown abdomens. Immature males, however, have the same coloration as the females. If you look at the first two photos below, you can see that the coloration and markings on the two dragonflies is quite similar, but the first one is an immature male and the second one is a female.
For Common Whitetails, the first thing I do is to look at the pattern of dark patches on the clear wings. Males have two patches per wing and females have three, including one that extends to the wingtip. This is really easy to see in the first two photos, because the dragonflies were perched above the ground.
Quite often, though, Common Whitetails will perch flat on the ground in the leaf litter, as in the third photo, and it is a little tougher to see the wing markings. As long as you can see a clear wingtip, however, you can tell that it is a male.
There are, of course, other ways to tell the gender of a Common Whitetail, if you can’t see the wings. If you look really closely at the tips of the abdomen (the “tail”), for example, you can see that they are shaped differently—the male’s terminal appendages are more tapered, while the female’s are more stubby in appearance.
I don’t consider myself an expert in dragonflies and my background is not in science, but I have learned about these colorful aerial acrobats over the last ten years of photographing them. Folks sometimes ask me how I can tell the gender of a dragonfly and I think it cool to be able to explain what is going on in my mind when I am trying to figure out what I have photographed. This is especially true when I have photos that show both the male and female of a species, as was the case with these Common Whitetail dragonflies.
© Michael Q. Powell. All rights reserved.
Read Full Post »
Mike Powell 