Order Rodentia - Family Muridae Author Guy G. Musser Author Michael D. Carleton text 1993 Smithsonian Institution Press Washington and London Editor Don E. Wilson Editor DeeAnn M. Reeder Mammal Species of the World (2 nd Edition) 501 755 book chapter http://doi.org/10.5281/zenodo.7353098 1-56098-217-9 7353098 Nesoryzomys Heller, 1904 . Proc. California Acad. Sci., 3:241 . TYPE SPECIES: Nesoryzomys narboroughi Heller, 1904 (= Oryzomys indefessus Thomas, 1899 ). COMMENTS: Oryzomyine. Realigned as a subgenus of Oryzomys by Ellerman (1941) , following the comments of Goldman (1918) . Morphological, genic, and karyological information, however, sustains the generic separation of Nesoryzomys ( Beaufort, 1963 ; Gardner and Patton, 1976 ; Patton and Hafner, 1983 ) and intimates that the group is an old Galapagos immigrant, originating ca. 3-3.5 mya (see Patton and Hafner, 1983 ).