A University of Sydney team reexamined Australian stick insects in the genus Anchiale and found that what were thought to be two species are actually five. The study, published in Austral Entomology, combined DNA analysis, museum specimens, field surveys, and citizen science observations from platforms like iNaturalist. Among the discoveries are two new species, including Anchiale mabiensis, found in Queensland's endangered Mabi rainforest, which lays eggs with a distinctive lid-like structure not previously documented in any stick insect.
The team also restored Anchiale robusta, a large stick insect that had been misidentified for decades despite being familiar to scientists and enthusiasts. Lead author Dr. Braxton Jones noted that taxonomy is like detective work, and even among Australia's most photographed insects, new species are still emerging. The findings highlight how much biodiversity remains undocumented, even in well-studied regions.
The revised classification has practical implications: one stick insect known for occasional population explosions and defoliating trees was found to represent multiple species. Distinguishing them could help land managers predict and mitigate impacts on forestry and agriculture. The researchers also suspect an additional new species from Cape York but need more specimens to confirm it. Dr. Jones emphasized the importance of protecting threatened ecosystems before species are lost without being discovered.