In the remote forests of the Indonesian part of New Guinea, living evidence of the past has unexpectedly surfaced: a small marsupial glider that scientists had long since consigned to the ranks of the extinct around six thousand years ago. Photographs taken back in 2015 by a local plantation worker led to an astonishing conclusion — the animal had not merely survived, but belongs to a genus entirely new to science.
The creature in question was previously known only from fossil remains under the name Petauroides ayamaruensis. These bones were found in West Papua and Papua New Guinea and were dated to a period between 7500 and 6000 years ago. Until recently, it was believed that the population had vanished along with the climate and landscape changes of the early Holocene. A comparison of the photographs with the shape of the teeth and the structure of the skeleton showed a complete match, yet at the same time revealed key differences from all known living marsupial gliders of Australia and New Guinea.
Scientists have assigned the animal to a separate genus, Tous — the name is taken from the local language of the indigenous inhabitants, who had long distinguished the "tous wansai" from other small gliders. Tous ayamaruensis has small bare ears, a prehensile tail capable of grasping branches almost like a hand, and dimensions smaller than those of its Australian relatives from the genus Petauroides. This is the first new genus of New Guinea marsupials described since 1937.
The discovery became possible thanks to a combination of modern photographs, a rare museum specimen from 1992 and, above all, the knowledge of indigenous communities. The local inhabitants not only helped identify the little animal but also told of its way of life: pair bonds, nests in the hollows of tall trees and, apparently, only one offspring a year. Such traits make the population vulnerable to any changes in its environment.
Scientists are deliberately not disclosing the exact location of the find in order to protect the rare animal from poachers. The forests of the Bird's Head Peninsula (Kepala Burung) are already under pressure from logging and the expansion of agricultural land. The survival of Tous ayamaruensis now depends on whether it will be possible to combine scientific interest with respect for traditional knowledge and strict protection of its habitats.
Such "Lazarus taxa" are a reminder that even regions that seem well studied at first glance may harbour ancient lineages of life whose survival depends on our decisions today.
