The Long-nosed Mosaic-tailed Rat is a terrestrial rodent recorded in southwestern New Guinea and the Aru Islands. It has a brown-rufous back, gray-white underside and one hair per tail scale. HMW 2017 follows the 1996 revision treating it as distinct from P. levipes.
The dorsal fur is brown-rufous and the underside gray-white. The tail is duller above and paler below, with one hair per scale.
It is terrestrial. The HMW2017 habitat entry gives lowland forest from sea level to 1,000 m.
An extinction-risk assessment has not been added yet.