Microhydromys musseri Flannery, 1989 . Proc. Linn. Soc. N.S.W, 111:216.

TYPE LOCALITY: Papua New Guinea, West Sepik Prov., Torricelli Mtns, Mt Somoro, 1350 m (see Flannery, 1989, for details) .

DISTRIBUTION: Known only from the type locality.

COMMENTS: Represented only by the holotype. A very distinct Microhydromys that is part of a highland fauna endemic to the N Coast ranges of Papua New Guinea (Flannery, 1989).