Appendix 1

Paraguayan specimens of Thrichomys fosteri analyzed in this study. Localities are mapped in Figure 1. Voucher specimens are housed at the following collections: University of Michigan Museum of Zoology (UMMZ), Ann Arbor, USA and Colección de Mamíferos, Universidad Austral de Chile (UACH), Valdivia, Chile. Specimens used in the morphometric analysis are indicated by an^m and those used in the genetic analysis are signalled by an*.

1) Amambay, 4 km by road SW Cerro Cora: UMMZ 125549 ^m, UMMZ 125550 ^m, UMMZ 125551 ^m. 2) Chaco, 50 km WNW Madrejón, Misión Nuevo Tribu: UMMZ 124302 ^m, UMMZ 125552^m. 3) Cordillera, 1.6 km by rd. S Tobati: UMMZ 126044 ^m, UMMZ 126045 ^m, UMMZ 126046 ^m, UMMZ 126047 ^m, UMMZ 126048 ^m, UMMZ 126049 ^m, UMMZ 126050 ^m, UMMZ 126092 ^m, UMMZ 126093 ^m, UMMZ 126094 ^m, UMMZ 126095 ^m, UMMZ 126096 ^m, UMMZ 126097 ^m, UMMZ 126098 ^m, UMMZ 126099 ^m, UMMZ 126100 ^m, UMMZ 126101 ^m, UMMZ 126102 ^m, UMMZ 126103 ^m. 4) Cordillera, Compania Minas-Cue, Emboscada, Prop. of Am. Filipinni Mora: UMMZ 174959 ^m*, UMMZ 174960 ^m*, UMMZ 174963 ^m*, UMMZ 174964 ^m*, UMMZ 174966 ^m*, UMMZ 174967 ^m*, UMMZ 175100 *, UACH 7264 *, UACH 7265 *, UACH 7266 *, UACH 7267 *, UACH 7268 *, UACH 7269 *, UACH 7270 *, UACH 7271 *. 5) Paraguari, 17km SE Piribebuy by rd., Saltos de Pirareta: UMMZ 124301 ^m.