This is native to Indonesia, Papua New Guinea, and just Queensland in Australia. It is said to be common and even abundant in some areas though I encountered just this one specimen on my FNQ 2022 trip.
A. longitudinalis is a somewhat unusual dragonfly in that the thoracic markings are more or less horizontal. This is rarely the case and makes it readily recognizable.
There are three subspecies noted, the one in Australia, this one, being A. longitudinalis biserialis.