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Unexpected diversity in the Andes of Ecuador: phylogeny of the Thomasomys “cinereus” group and description of a new species (Rodentia, Cricetidae). Based on specimens collected in the southeastern Andes of Ecuador, at Parque Nacional Sangay, but also including animals from mammal collections, a revision of the species of the group “cinereus” of the cricetid genus Thomasomys Coues, 1884 (Sigmodontini, Thomasomyini) was made. As a result, concomitantly to a new phylogeny based on a molecular marker (Cytb), a new species is recognized. It corresponds to a medium-sized Thomasomys which can be distinguished from the other species of the genus by the following traits: long tail, broad space between thenar and hypothenar pads, length of the maxillary toothrow < 5.6 mm, breadth of zygomatic plate < 2.9 mm, Recibido 13 febrero 2019. Aceptado 17 setiembre 2019. Publicado Online: 24 setiembre 2019. Editor asociado: S. Solari. EL GRUPO “cinereus” DE Thomasomys 309 sphenopalatine vacuities as slits, posterior margin of nasals surpassing the level of the lacrimals, M1 with broad anteroloph and narrow mesoloph, M2 with short mesoloph, m1 with delicate mesolophid, and m2 with minute mesolophid. The new species of Thomasomys, at the moment endemic for the Parque Nacional Sangay, shows a genetic distance of 9.18% with respect to its sister species, T. caudivarius, which inhabits the southwestern Andes of Ecuador. With the reported nding, the richness of Thomasomys in Ecuador increases to 15 species, and rivals the one registered in Colombia. Finally, we pose the necessity to join e orts in order to produce a signi cant advance in the knowledge of this complex genus of Andean sigmodontines. Palabras clave: Parque Nacional Sangay, Sigmodontinae, Thomasomyini, Thomasomys caudivarius, Thomasomys silvestris.

DIVERSIDAD INSOSPECHADA EN LOS ANDES DE ECUADOR: FILOGENIA DEL GRUPO “cinereus” DE Thomasomys Y DESCRIPCIÓN DE UNA NUEVA ESPECIE (RODENTIA,CRICETIDAE)