Newly discovered "Stick insect" species breaks record for heaviest insect in Australia

Newly discovered "Stick insect" species (Image: Ditsayaalongkorn)

Scientists have uncovered Australia’s heaviest insect up to date. A newly described stick insect species found in northern Queensland. This species was found in high canopy rainforest.

The species, named Acrophylla alta, measures around 40 cm (16 inches) in length and weighed in at up to 44 grams, which is roughly the mass of a golf ball.

Remote habitat yields a giant

The discovery comes from the mist-shrouded canopy of the Atherton Tablelands and adjacent high-altitude rainforest in the Wet Tropics of Queensland. The researchers found the insect’s extreme size may be tied to its cool, wet habitat, where a heavier body could help retain warmth in the canopy environment.

The insect eluded previous detection largely because it lives high in trees that are difficult to access. One scientist noted that only few people get to see these species as they are highly unrecognisable.

New species confirmed by eggs and morphology

Researchers at James Cook University and Wildlife experts identified the species. They used both adult specimens and their distinct eggs for research purpose. Each stick-insect species has unique egg form and texture.

Two female specimens are now archived at the Queensland Museum for further study. The male of the species remains undiscovered. Scientists believe that finding a male is important for full classification and understanding of life cycle and behaviour.

Biodiversity and conservation

The discovery of Acrophylla alta underlines how much remains unknown about insect diversity. Even in well-studied countries such as Australia, up to 70 % of insect species remain undescribed.

The finding also emphasise on the value of protecting high-altitude rainforest habitats. This rainforest harbour rare and specialised fauna including newly discovered large insects.