A new species of Andean mouse of the genus Thomasomys (Cricetidae, Sigmodontinae) from the eastern Andes of Ecuador

Researchers have identified and described a new species of Andean mouse, the largest of its genus found in Ecuador. This rodent, belonging to the 'aureus' group within the Thomasomys genus, inhabits the wet montane forests of Sangay National Park at elevations between 3,400–3,900 meters. Molecular phylogeny analysis using mitochondrial genes confirmed its distinct status and close relationship with an undescribed species from northern Ecuador. This discovery increases the known diversity of Thomasomys to 48 species, with 18 now recognized in Ecuador alone.

Lee Jr., T. E., Tinoco, N., & Brito, J. (2022). A new species of Andean mouse of the genus Thomasomys (Cricetidae, Sigmodontinae) from the eastern Andes of Ecuador. Vertebrate Zoology, 72, 219–233. https://doi.org/10.3897/vz.72.e78219