Species of dragonfly
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Gynacantha nourlangie is a species of dragonfly in the family Aeshnidae, 
known as the cave duskhawker. 
It inhabits pools in caves in northern Australia.
"Gynacantha nourlangie" is a large, sandy brown dragonfly with a constricted waist in its abdomen at segment 3. It is a crepuscular insect and flies at dawn and dusk.
It is widely distributed across northern Australia, from the Kimberley in Western Australia, through the north of Northern Territory and Cape York in Queensland.
Etymology.
"Gynacantha nourlangie" is named after Nourlangie Creek in western Arnhem Land, Northern Territory, Australia, where it can be found.
References.
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