Archaeosynthemis occidentalis  Archaeosynthemis occidentalis is a species of dragonfly of the family Synthemistidae, known as the western brown tigertail. It is a medium-sized dragonfly with reddish-brown and yellow markings. It is endemic to south-western Australia where it inhabits boggy creeks and swamps. "Archaeosynthemis occidentalis" appears similar to "Archaeosynthemis orientalis" found in eastern Australia.