A new species of murid rodent (genus Mayermys) from south-eastern New Guinea

Mayermys is the only muroid genus with a single molar in each quadrant of the jaw. This distinctive genus is restricted to montane New Guinea and has previously been considered monotypic. Here a second species of Mayermys is described from the mountains of far south-eastern Papua New Guinea. The dentition of this new species is more reduced than that of any other species of rodent, living or fossil.