to the discoverers, S. macrorhinos is a member of the so-called "Old Endemics " of Sulawesi and the Philippines. It is especially related to Crunomys, which lives on both Sulawesi and the Philippines and the Philippine Archboldomys. The Melasmothrix-Tateomys group may also be related. References Musser, G.G. & Durden, L.A. 2002. Sulawesi rodents: description of a new genus and species of Murinae (Muridae, Rodentia) and its parasitic new species of sucking louse (Insecta, Anoplura). American Museum Novitates 3368:1-50. External links PDF file of the original description of Sommeromys macrorhinos Sulawesi rat, Sommer's Old World rats and mice Sulawesi rat, Sommer's Sulawesi rat, Sommer's Mammals described in 2002