CONICET | Buscador de Institutos y Recursos Humanos

The genus Ctenomys is represented by 68 species within at least 9 species groups. In Patagonia, there are 11 described species of Ctenomysin 3 phylogenetic species groups: (1) the sociabilis group; (2) the magellanicus group; and (3) the mendocinus groupadded to this is C.maulinus, which is not clearly related to any species group. The magellanicus group is the most representative of Patagonia and includes 6species, several unnamed forms, and has a widespread distribution from Río Negro and Neuquén provinces in the north of Patagonia toTierra del Fuego province to the south. The magellanicus group is a highly supported clade and comprises 3 geographically defined lineages:the bidaui clade (northern clade) composed of C. bidaui, C. pulcer, and several undescribed forms; the polytypic haigi clade (central clade)comprising C. haigi, C. contrerasi, C. thalesi, C. sericeus, and Ctenomys cf. C. lentulus (sensu Teta and DElía 2020); and the monotypic magellan-icus clade (southern clade) consisting of haplotypes assigned to C. magellanicus (including C. colburni). Ctenomys magellanicus (MagellanicTuco-tuco) is widely distributed from southern Santa Cruz province in Argentina and central Aysén in Chile to Isla Grande de Tierra delFuego in Argentina and Chile. Based on mitochondrial Cytochrome b DNA sequences and morphological assessment (qualitative andquantitative), we describe a new species of Ctenomys related to C. magellanicus from northwestern Chubut Province, Argentina. We provideanatomical comparisons between the new species and other species of Ctenomys from Patagonia, especially C. magellanicus, C. haigi, andC. plebiscitum. In addition, we recognize 2 groupings within C. magellanicus because of their morphometric differences, and report newlocalities for C. haigi and C. plebiscitum.

enviar mensaje