Stygian Shadowdragon

Neurocordulia yamaskanensis, the Stygian shadowdragon, is a dragonfly found in the eastern United States and southern Canada. It was discovered in Quebec in 1875 by naturalist Léon Abel Provancher.

Like other dragonflies of the genus Neurocordulia, this species has the unusual characteristic of being crepuscular in habit, meaning that they are only active for a short period of time during dawn and at dusk. This limited activity period means that this species and other members of the genus are rarely seen by the casual observer. They may occasionally fly during very overcast days, but usually spend their days roosting in treetops and bushes near the shoreline of the streams, rivers and lakes which they patrol during their active hours.