For fifty years, it wore the wrong name, and no one noticed.

There is a particular kind of discovery that happens not in remote jungles or unexplored caves, but in the drawers of museums and the databases of citizen scientists—places where information has been waiting, patient and unexamined, for someone to ask the right question. For nearly fifty years, a large stick insect collected from Australia's rainforests sat in collections, labeled with a name that was not quite right. It took a team of insect detectives, combining DNA analysis with old-fashioned observation, to reveal what had been hiding in plain sight.

Researchers at the University of Sydney have revised the Australian representatives of the stick insect genus Anchiale, identifying two new species and reinstating a third that had been misidentified for decades . The findings, published in Austral Entomology, reveal that what were considered two species are actually five distinct species stretching from northern New South Wales through coastal Queensland and into the tropical north .

One of the most significant discoveries involved a large stick insect known to scientists and enthusiasts for decades. Records of the species date back to at least 1976, when its egg case was misidentified as belonging to a different species . After combining DNA analysis, museum collections, field surveys, citizen science records from iNaturalist and the Atlas of Living Australia, and studies of captive populations, researchers determined the insect was an entirely new species: Anchiale robusta . The name reflects its size—it is larger than its closest relative .

The second new species, Anchiale mabiensis, was found in Queensland's critically endangered Mabi rainforest on the Atherton Tablelands. As of 2021, only about 1,050 hectares of this rainforest remained, fragmented into patches surrounded by agricultural land . The species appears to be endemic to this threatened ecosystem. Its eggs contain a structural lid unlike anything previously recorded in stick insects or their closest relatives—a coffee-brown casing with inner rings on the egg's lid .

The research has practical implications beyond taxonomy. A stick insect known for forming plague-like population outbreaks that can strip foliage from trees was found to consist of more than one species . Untangling those species relationships will help improve future management of impacts on forestry and agriculture, allowing authorities to target the correct species when outbreaks occur.

Lead author Dr. Braxton Jones from the Aola Richards Sydney Insect Hub described the work as detective-like. "Even among some of Australia's most photographed and frequently reported insects, we're still finding species that have escaped scientific recognition," he said . Despite more than 1,000 citizen science observations and decades of study, the researchers say Australia is still only scratching the surface of its insect diversity .

The study even identified a likely additional undescribed species from Cape York, though more specimens are needed before its identity can be confirmed . For Jones, the findings carry a broader message. "These findings demonstrate the importance of protecting threatened ecosystems and documenting Australia's extraordinary biodiversity before we lose species without us having even discovered them," he said .

Researchers at the University of Sydney have identified two new stick insect species and reinstated a third that was misidentified for decades. The discoveries, made through DNA analysis and citizen science records, highlight how much remains unknown about Australia's insect biodiversity.

AI Image Disclaimer: The images in this article are AI-generated and are for illustrative purposes only. They do not depict actual specimens or locations.

Sources: EurekAlert!, University of Sydney, ScienceAlert, Scimex, Austral Entomology