Pseudoryzomys simplex (Winge)

D’Elía, Guillermo, Mora, Ismael, Myers, Phil & Owen, Robert D., 2008, New and noteworthy records of Rodentia (Erethizontidae, Sciuridae, and Cricetidae) from Paraguay, Zootaxa 1784, pp. 39-57 : 49

Pseudoryzomys simplex (Winge)

Fig. 6 . Table 1

Type Locality: Lagoa Santa, Minas Gerais, Brasil.

Distribution: Southern Peru, Eastern Bolivia, eastern and central Brazil, western Paraguay, and northeastern Argentina.

New records: ÑEEMBUCU: 13) Estancia Yacaré, Puesto San Fernando 26º 35.511’ S 58º 08.329´W (GD 065); 14) Estancia Yacaré, 26 38.05’ S 58 08.27’ W, 60 m (TK 61744). Figure 1 .

Taxonomy: Oryzomys wavrini Thomas (type locality in the Paraguayan Chaco) and P. wavrini reigi Pine and Wetzel are considered synonyms of P. s i m p l e x ( Voss & Myers 1991).

Comments: These specimens constitute the first record of the genus east of the large Paraguay River (Paraguayan Oriental Region). Moreover, these records are the first example of P. s i m p l e x east of the Paraguay- Paraná rivers system in Argentina and Paraguay (see Pardiñas et al. 2004). A cyt b haplotype (773 bp) of one of the specimens (GD 065: EF621306 ) from Ñeembucu differs by 1.4 % from a haplotype of a Chacoan specimen (TK 62425: EF621307 ) collected across the Paraguay River and about 600 km to the northwest in Alto Paraguay (21º 17.93' S 59º 33.87' W). A female collected in September (1999) had a closed vagina. Specimens in Ñeembucu were collected with traps set on the ground in humid grassland along with specimens of Akodon azarae and Holochilus chacarius Thomas.

Figures

FIGURE 1. Map of Paraguay indicating the localities where the specimens reported here were collected. Locality numbers refer to those of the text.

FIGURE 6. Dorsal, ventral and lateral views of the cranium and mandible of Pseudoryzomys simplex from eastern Paraguay (TK 61744). Scale bar = 5 mm.