Invertebrates
Common Whitetail
Plathemis lydia · also called whitetail dragonfly
A dragonfly patrolling the edge of a pond flashes an abdomen so thickly coated in chalky white powder that it barely resembles the brown, spotted juvenile it once was, a transformation that gives the common whitetail both its name and one of the more recognisable silhouettes among North American dragonflies.
Overview
The common whitetail, Plathemis lydia, is a widespread dragonfly native to still or slow-moving pond, lake, and marsh habitat across most of the United States and southern Canada. Its dramatic white pruinose abdomen in mature males, bold dark wing bands, and territorial shoreline-patrolling behaviour make it one of the most familiar and easily identified dragonflies in North America.
A colour change that arrives with age
What begins as an unremarkable brown, spotted dragonfly gradually transforms as a male matures, developing a chalky white abdomen striking enough to make the common whitetail one of the more visually distinctive dragonflies patrolling any given pond.
Status
Least Concern — extremely widespread and abundant across suitable pond and lake habitat throughout most of the United States and southern Canada.
Common Whitetail: common questions
Why do male common whitetails turn white?
A mature male develops a heavy coating of white pruinosity, a waxy powder produced as the dragonfly ages, across its abdomen, a colour change that makes mature males considerably more conspicuous than the brown, spotted pattern they and females share as younger individuals, likely playing a role in mate recognition and territorial signalling to rival males.
How can you identify a common whitetail dragonfly?
Look for a broad dark band across the middle of each wing, visible in both sexes, combined in mature males with a heavily whitened abdomen; females and immature males instead show a brown body marked with pale spots along the sides, lacking the white pruinosity entirely.
Why do male common whitetails patrol the shoreline?
Adult males actively patrol and defend a stretch of pond or lake shoreline against rival males, a territorial behaviour that helps secure the best available spots for encountering and mating with females, a pattern of behaviour shared broadly among many perching dragonfly species.
How common is the common whitetail dragonfly?
This species is among the most frequently encountered dragonflies across a very broad range spanning most of the United States and southern Canada, often one of the first species newcomers to dragonfly watching learn to recognise given how widespread and visually distinctive mature males are.