Horacio Zeballos P., Eduardo Palma R., Pablo A. Marquet, Gerardo Ceballos González



We reviewed the phylogenetic relationships of forms assigned to Calomys sorellus based on the Cytochrome b gene sequences and morphological comparisons. We present the first description of the evolutionary relationships within the C. sorellus species complex. The results show a clade with species from lowlands of Eastern of Andes and other clade with Andean species which contains: C. musculinus, C. sorellus and C. lepidus which would be species complex. One of the new species occurs in the Atiquipa Lomas in the coastal desert of southern Peru, and other on the occidental slope of southern Peru in Arequipa and Moquegua. These new species are based upon considering their phenotypic characteristics (size, coloration, pelage), geographic distribution, and molecular phylogeny.

 Key words: New species, rodent, Sigmodontinae, biodiversity, Peru.  


Revisamos las relaciones filogenéticas de las formas asignadas a Calomys sorellus basados en secuencias nucleotídicas del gen mitocondrial Citocromo b así como de caracteres morfológicos. Los resultados muestran un clado que agrupa a las formas  de las tierras bajas al este de los Andes y a un clado andino, compuesto por: Calomys musculinus, Calomys sorellus y Calomys lepidus que serían complejos de especies. C. sorellus estaría compuesto por al menos cinco especies, tres de ellas fueron previamente definidas como subespecies, a las que agregamos dos especies nuevas. Una de ellas habita en las lomas de Atiquipa en la costa desértica del sur del Perú, y la otra en las vertientes occidentales de los Andes del sur del Perú en Arequipa y Moquegua. Estas nuevas especies están definidas por sus diferencias morfológicas y moleculares y por su tamañp corporal, pelaje y distribución geográfica.  

Palabras clave: Especie nueva, roedor, Sigmodontinae, biodiversidad, Perú.

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