Potamarcha congener is also known as the yellow-tailed ashy skimmer, common chaser, or swampwatcher. It is a species of dragonfly in the family Libellulidae, and was first described by Jules Pierre Rambur in 1842, almost fifty years before Friedrich Karsch described its genus. Potamarcha congener is one of two species making up the genus Potamarcha, together with Potamarcha puella.

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