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).