Comentarios sobre el estatus de Calomys callosus (Rengger, 1830) y nuevos datos sobre la distribución de micromamíferos en el noroeste de la provincia de Corrientes (Argentina).

CONTRERAS JULIO R; TETA PABLO; ANDRADE ANALIA

Revista del Museo Argentino de Ciencias Naturales

Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"

Lugar: Buenos Aires; Año: 2003 vol. 5 p. 73 - 78

1514-5158

From cytogenetic and morphologic data, correspondence between Calomys callosus and C. callidus is discussed. The karyotypes described here for the Corrientes Province specimens of C. callosus are almost identical with that described by others authors for specimens from Entre Ríos Province (ascribed to C. callidus). Known data restrict the geographic range of Calomys callosus to the neighbourhood of the flood valley of the Paraguay River and the Argentine Mesopotamia. Furthermore, new distributional records of 16 species of small mammals (Marsupialia, Chiroptera, Rodentia) are presented from two localities at the northwestern of the province of Corrientes: El Sombrero (27º 70’S - 58º 58’ O), department of Empedrado and El Pontón (27º 56’S - 58º 45’ O), department of San Luis del Palmar. At both localities bone remains, mainly hemimandibles and cranial fragments, were recovered from Barn Owl´s pellets. The samples are largely dominated by Holochilus sp., with low frequencies of Akodon cf. A. azarae, Akodon montensis, Calomys callosus, Gracilinanus agilis, Necromys temchuki, Oligoryzomys sp. cf. O. flavescens, Oligoryzomys nigripes, Scapteromys aquaticus and Oxymycterus rufus.