Order Rodentia - Family Cricetidae Author Wilson, Don E. Author Reeder, DeeAnn text 2005 The Johns Hopkins University Press Baltimore Mammal Species of the World: a Taxonomic and Geographic Reference (3 rd Edition), Volume 2 955 1189 book chapter 0-8018-8221-4 10.5281/zenodo.7316535 Oryzomys angouya (G. Fischer 1814) [Oryzomys] angouya (G. Fischer 1814) , Zoognosia Tabulis Synopticis Illustrata: 71 . Type Locality: Paraguay , Misiones Dept., east of the Río Paraguay , 2.7 km (by road) N San Antonio (as fixed by neotype designation by Musser et al., 1998). Vernacular Names: Angouya Oryzomys . Synonyms: Oryzomys angouya (Desmarest 1819) ; Oryzomys anguya ( Rengger 1830 ) ; Oryzomys buccinatus ( Olfers 1818 ) ; Oryzomys leucogaster (Wagner 1845) ; Oryzomys paraganus Thomas 1924 ; Oryzomys ratticeps (Hensel 1872) ; Oryzomys rex ( Winge 1887 ) ; Oryzomys tropicius Thomas 1924 . Distribution: SE Brazil , NE Argentina , and E Paraguay . Conservation: IUCN – Lower Risk (lc) as O. buccinatus and O. ratticeps . Discussion: Oryzomys angouya is the oldest available name based on Azara’s (1801) "Rat troisieme, ou Rat Angouya ," a species conventionally known as O. buccinatus and-or O. ratticeps ( Avila-Pires, 1960 a ; Cabrera, 1961; Ellerman, 1941 ; Gyldenstolpe, 1932 ; Hershkovitz, 1959 a ; Moojen, 1952 ; Musser and Carleton, 1993 ; Thomas, 1924 b ). Morphology characterized, neotype designated, and synonyms attributed by Musser et al. (1998). Slight karyotypic variation, reflecting supernumerary chromosomes, reported for specimens from Rio de Janeiro , Brazil (2n = 80-82, FN = 88-90; Pereira et al., 2001).