When it is really hot and the sun is directly overhead, Blue Dasher dragonflies (Pachydiplax longipennis) will often perch in a handstand-like pose that is generally referred to as the “obelisk posture.” By doing this, they minimize the direct exposure of the abdomen’s surface to the sun and stay cooler. Some other dragonflies will also engage in this kind of postural thermoregulation, but I see it most commonly in Blue Dashers.
Blue Dashers, one of our most common dragonflies, were largely responsible for my initial fascination with dragonflies. In fact, almost three years ago my very first posting on this blog featured a Blue Dasher in an obelisk posture.
Since that time, I have grown in experience and knowledge and have cranked out over 1600 posts. My fascination with dragonflies has broadened and grown into a quasi-obsession, but I am always drawn back to the little Blue Dasher dragonfly, whose acrobatic poses never cease to amaze and entertain me.
Michael Q. Powell. All rights reserved.
Mike Powell 