First record of genus Cryptonanus (Didelphimorphia) in the state of Rio de Janeiro, Brazil

Here we report the first record of genus Cryptonanus in the state of Rio de Janeiro, Brazil. One specimen (MZUSP35409) was captured in an Atlantic Forest fragment and was identified by morphological characters and molecular analysis using cytochrome‑b (MT-CYB) and von Willebrand Factor (VWF). Phylogenetic reconstructions based on VWF sequences positioned our specimen into the genus Cryptonanus, and the shortest genetic distance of MT-CYB was estimated between our specimen and an undescribed specimen from Piauí. Our record increases the genus’ geographic range approximately 350 km from Cotia and Ibiúna municipalities, São Paulo. The genus Cryptonanus remains taxonomically poorly understood

First record of Drymoreomys albimaculatus Percequillo, Weksler & Costa, 2011 (Rodentia, Cricetidae, Sigmodontinae) in Rio de Janeiro state, Brazil

Here we report the first record of Drymoreo­mys albimaculatus Percequillo, Weksler & Costa, 2011 (Cricetidae, Sigmodontinae) in Rio de Janeiro state, Brazil. One specimen was captured at Serra da Bocaina National Park, municipality of Paraty. The specimen was captured in a pitfall trap, in a mixed habitat of forest and bamboo. The karyotype showed 2n = 62 and FN = 62, which is similar to the previously described for the species

First record of genus Cryptonanus (Didelphimorphia) in the state of Rio de Janeiro, Brazil

Here we report the first record of genus Cryptonanus in the state of Rio de Janeiro, Brazil. One specimen (MZUSP35409) was captured in an Atlantic Forest fragment and was identified by morphological characters and molecular analysis using cytochrome‑b (MT-CYB) and von Willebrand Factor (VWF). Phylogenetic reconstructions based on VWF sequences positioned our specimen into the genus Cryptonanus, and the shortest genetic distance of MT-CYB was estimated between our specimen and an undescribed specimen from Piauí. Our record increases the genus' geographic range approximately 350 km from Cotia and Ibiúna municipalities, São Paulo. The genus Cryptonanus remains taxonomically poorly understood