Odonata: Libellulidae
Orthetrum boumiera
"Brownwater Skimmers appear to be confined to brown acidic dune lakes with shallow littoral margins" according to The Complete Field Guide To Dragonflies of Australia, Gunther Theischinger and John Hawking.
Lake Poona in the Great Sandy National Park is such a lake and I went there with high expectations. I was not disappointed and soon found myself surrounded by Brownwater Skimmers and the odd Blue Skimmer to show me the differences.