Leadbeater's Possum

Le phalanger de Leadbeater (Gymnobelideus leadbeateri) est une espèce d'opossum de la famille des Petauridae endémique de l'Australie. C'est l'unique espèce du genre Gymnobelideus. Il doit son nom à l'ancien taxidermiste du musée d'histoire naturelle de l'État de Victoria, John Leadbeater.

Leadbeater's possum (Gymnobelideus leadbeateri) is a critically endangered possum largely restricted to small pockets of alpine ash, mountain ash, and snow gum forests in the Central Highlands of Victoria, Australia, north-east of Melbourne. In June 2025 it was reported that an image of a sole possum was recorded on a camera trap in October 2024 near Yarrangobilly Caves, Southern NSW, within the Kosciuszko National Park. It is primitive, relict, and non-gliding, and, as the only species in the petaurid genus Gymnobelideus, represents an ancestral form.

El falangero de Leadbeater o del río Bass (Gymnobelideus leadbeateri) es una especie de marsupial diprotodonto de la familia Petauridae. Es la única especie de su género, de la que no se reconocen subespecies​ y es endémico de Australia. ​ Es el animal estatal de Victoria.