Petaluroidea

The petaltails, also called graybacks, of the family Petaluridae are among the most ancient of the extant true dragonflies (infraorder Anisoptera), having fossil members from as early as the Jurassic, over 150 million years ago. A 2024 molecular phylogeny found that the petaltails comprise two clades, a Gondwanan clade and a Laurasian clade. Their divergence time was estimated at 160 million years ago.