Thought Extinct for 6,000 Years, These Tiny Marsupials Have Just Been Rediscovered
Researchers have confirmed the existence of two marsupial species—the pygmy long-fingered possum (Dactylonax kambuayai) and the ring-tailed glider (Tous ayamaruensis)—previously known only from fossils and local legends. The rediscovery highlights New Guinea’s extraordinary biodiversity and the urgent need to protect its ecosystems.
Rediscovering Lost Life in New Guinea
During a 2026 expedition into the Cyclops Mountains of West Papua, an international team of researchers rediscovered two marsupial species thought to have been extinct for over 6,000 years. Scientists had previously known these animals only through fossil fragments and the oral histories of local Indigenous peoples. These species are referred to as “Lazarus taxa” since they appear to have miraculously returned from extinction.
The term “Lazarus species” is inspired by the biblical figure raised from the dead, and describes organisms rediscovered long after being declared extinct.
Two Rediscovered Marsupials
The pygmy long-fingered possum weighs around 200g (0.44 pounds) and is distinguished by its extraordinarily elongated fourth finger, which is twice the length of its other digits. It uses this specialized finger to forage for insect larvae within tree trunks.
The ring-tailed glider represents a completely new genus—the first to be described in New Guinea in nearly 90 years. It possesses a prehensile tail, allowing it to grasp branches and navigate the dense forest canopy, feeding on leaves and tree sap.
Why New Guinea Is a Biological Hotspot
New Guinea is recognized as one of the world’s most biologically diverse regions, harboring approximately five percent of the planet’s biodiversity despite covering less than one percent of Earth’s landmass. Its complex geography, geological history, and isolation contribute to its unique evolutionary environment.
The island’s mountainous terrain creates “sky islands”—isolated habitats that promote rapid speciation. The collision of tectonic plates has also brought together fauna from both Australia and Southeast Asia.
Implications of This New Discovery
The rediscovery of these two marsupials underscores the importance of collaboration with local communities, such as the Maybrat and Tambrauw peoples, who have long known about and protected these species. The animals are considered “hyper-vulnerable,” with limited populations restricted to modest areas of forest, making them susceptible to habitat loss and illegal trafficking. Researchers are keeping the exact locations of their habitats confidential to protect them.
These findings also support the Refuge Hypothesis, which suggests that the Vogelkop Peninsula served as a biological sanctuary, allowing ancient species to survive while others disappeared elsewhere.
The pygmy long-fingered possum and ring-tailed glider are more than biological curiosities; they are living links to a prehistoric world. Their rediscovery serves as a reminder that extinction is not always final, and that respecting local knowledge is crucial for safeguarding fragile ecosystems.