The western New Guinea mountain rat (''Rattus arrogans'') is a species of rodent in the family

Muridae The Muridae, or murids, are the largest family of rodents and of mammals, containing approximately 1,383 species, including many species of mice, rats, and gerbils found naturally throughout Eurasia, Africa, and Australia. The name Muridae comes ...

. It is widespread in the mountains of central and western New Guinea.

References

Rattus Rodents of New Guinea Endemic fauna of New Guinea Mammals of Western New Guinea Rodents of Indonesia Mammals described in 1922 Taxa named by Oldfield Thomas {{Muridae-stub