Resumen

PARDINAS, Ulyses F. J et al. New morphological data and a phylogenetic hypothesis for Phaenomys (Rodentia, Cricetidae). Mastozool. neotrop. [online]. 2014, vol.21, n.2, pp.251-261. ISSN 0327-9383.

Based on 2 collected specimens of the rodent Phaenomys ferrugineus (Thomas), an endemic species of the Atlantic Forest, novelty information about its anatomy is provided as well as the results of the first phylogenetic analysis based on DNA sequences including this genus. This sigmodontine is characterized by a skull with marked supraorbitary crests, a well developed basicranial region, a primitive circulatory carotid pattern, the presence of a tegmen tympani, the absence of alisphenoid strut, and a mandible showing an important development of the region where the internal pterigoid muscle inserts. Phaenomys has 12 ribs, an unilocular-hemiglandular stomach, lacks gall bladder and has a large blind gut. A phylogeny based on the combined analysis of 2 molecular markers retrieves Phaenomys as sister to the genus Wiedomys. The plausible existence of a clade including endemic genera of the southeastern portion of the subcontinent, is discussed.

Palabras clave : Brazil; Juliomys; Thomasomyini; Wiedomys; Wilfredomys.

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