Nyctomyini is a tribe of New World rats and mice in the subfamily Tylomyinae which includes two genera, Nyctomys and Otonyctomys, each with a single species. Both are medium-sized rats with tawny to brownish fur and a hairy tail.Musser and Carleton, 2005, p. 1187
Classification Tribe Nyctomyini Genus Otonyctomys Hatt's vesper rat, Otonyctomys hatti Genus Nyctomys Sumichrast's vesper rat, Nyctomys sumichrasti
References
Musser, G. G. and M. D. Carleton. 2005. Superfamily Muroidea. pp. 894–1531 in Mammal Species of the World a Taxonomic and Geographic Reference. D. E. Wilson and D. M. Reeder eds. Johns Hopkins University Press, Baltimore.