The family Petauridae includes 11 medium-sized possum species: four striped possums, six species of wrist-winged gliders in the genus Petaurus and Leadbeater's possum, which has only vestigial gliding membranes. Most of the wrist-winged gliders are native to Australia, most of the striped possums (genus Dactylopsila) to New Guinea, but some members of each are found on both sides of the Torres Strait.