Oryzomys nigripes (Olfers, 1818). In Eschwege, Neue Bibl. Reisenb., 15:209. TYPE LOCALITY: Paraguay, Paraguari Dept., Ybycui Nat. Park, 85 km S.S.E. Atyra. DISTRIBUTION: Paraguay; E. Brazil; Argentina. COMMENT: Includes eliurus; see Cabrera, 1961:394, Massoia and Fornes, 1967, Acta Zool. Lilloana, 23:407-430, and Myers and Carleton, 1981, Misc. Publ. Mus. Zool. Univ. Mich., 161:35; but see Massoia, 1973, Rev. Invest. Agro. INTA, ser. 1, 10(l):21—37. O. eliurus may be a distinct species, based on karyotypic differences (OAR). Subgenus Oligoryzomys; see Hershkovitz, 1966, Z. Saugetierk., 31: 137, who included flavescens, fulvescens, and longicaudatus in this species, but Gardner and Patton, 1976, Occas. Pap. Mus. Zool. La. St. Univ., 49:20, 24, considered them distinct species and indicated that the relationship between nigripes and longicaudatus requires elucidation. Myers and Carleton, 1981, Misc. Publ. Mus. Zool. Univ. Mich., 161:1 -41, considered longicaudatus and flavescens distinct species, and also considered tarso nigro Fischer, 1814, invalid (see comments under Reithrodon physodes); AL employs the name tarsonigro for this species. Cabrera, 1961:380, placed Oligoryzomys in subgenus Oryzomys as a synonym. ISIS NUMBER: 5301410008035048001.

{"references": ["Massoia, E., and A. Fornes. 1967. El estado sistematico, distribucion geografica y datos etoecologicos de algunos mamiferos neotropicales (Marsupialia y Rodentia), con la descripcion de Cabreramys, genero nuevo (Cricetidae). Acta Zoologica Lilloana, 23: 407 - 430.", "Myers, P., and M. D. Carleton. 1981. The species of Oryzomys (Oligoryzomys) in Paraguay and the identity of Azara's \" Rat sixieme ou rat a tarse noir \". Miscellaneous Publications, Museum of Zoology, University of Michigan, 161: 1 - 41.", "Massoia, E. 1973. Descripcion de Oryzomys fornesi, nueva especie y nuevos datos sobre algunas especies y subespecies argentinas del subgenero Oryzomys (Oligoryzomys) (Mammalia-Rodentia-Cricetidae). Revista de Investigaciones Agropecuarias, INTA, Serie 1, Biologia y Produccion Animal, 10: 21 - 37.", "Gardner, A. L., and J. L. Patton. 1976. Karyotypic variation in oryzomyine rodents (Cricetinae) with comments on chromosomal evolution in the Neotropical cricetine complex. Occasional Papers of the Museum of Zoology, Louisiana State University, 49: 1 - 48."]}

Published as part of James H. Honacki, Kenneth E. Kinman & James W. Koeppl, 1982, Order Rodentia (Part 3), pp. 392-476 in Mammal Species of the World (1 st Edition), Lawrence, Kansas, USA :Alien Press, Inc. & The Association of Systematics Collections on page 442, DOI: 10.5281/zenodo.7353031