Onchestus rentzi is an Australian species of stick insect, commonly named the crowned stick insect, described in 2006.[1] It lives in rainforests along the coast of Queensland and the Northern Territory. It is named after the Australian orthopterist David Rentz.
Crowned stick insects are dark black-grey and use camouflage to blend in with the surroundings. Adults can reach lengths of 120mm and have a protuberance of the cuticle of the head which resembles a crown in both sexes. The wings of this species are a deep purple in colour.