Calomys tocantinsi Bonvicino, Lima, and Almeida 2003

Calomys tocantinsi Bonvicino, Lima, and Almeida 2003, Rev. Brasil. Zool., 20: 301.

Type Locality: Brazil, Tocantins State, 33 km SW Formoso do Araguaia, Rancho Beira Rio; 11º47′S, 49º45′W.

Vernacular Names: Tocantins Laucha.

Distribution: Cerrado habitat, states of Mato Grosso and Tocantins, C Brazil.

Discussion: A large species, similar in size to C. callosus and C. expulsus but morphometrically and karyotypically (2n = 46, FN = 66) well differentiated from those species and from C. tener (Bonvicino et al., 2003 c) . The new form was first detected based on its distinctive karyotype (Lima and Kasahara, 2001).