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Field surveys of the Manu Biosphere Reserve in southeastern Peru between 1999 and 2001 secured specimens of a remarkable new species of mouse (Rodentia: Sigmodontinae). Curiously, this mouse shares numerous traits with the enigmatic Brazilian mouse Rhagomys rufescens (Thomas, 1886), known only from a pair of fragmentary specimens collected in Atlantic forest habitats during the 19th century. The position of Rhagomys within the Sigmodontinae radiation has been incertae sedis, owing both to its unique features and the limited materials for phylogenetic analysis. Here we provide a diagnosis and description of the new mouse and assess its relationships to Rhagomys rufescens on the basis of morphology; ongoing studies will shed more light on its phylogenetic relationships using morphological and genetic data in a complete phylogenetic analysis. This newly identified species widens the distribution of the genus in a disjunct pattern of distribution in South America. As recently suggested by Smith and Patton (1999), the genus Rhagomys may represent an independent lineage of Neotropical sigmodontines, one perhaps deserving of tribal recognition.

A remarkable new mouse (Muridae: Sigmodontinae) from southeastern Peru : with comments on the affinities of Rhagomys rufescens (Thomas, 1886)