The taxonomic status of Nectomys saturatus Thomas, 1897 (Cricetidae: Sigmodontinae).

Nectomys (Sigmodontinae, Oryzomyini) is currently composed by five species: Nectomys apicalis, N. magdalenae, N. palmipes, N.

How many species of mammals are there in Brazil? New records of rare rodents (Rodentia: Cricetidae: Sigmodontinae) from Amazonia raise the current known diversity.

Background: Since 1996, when Vivo questioned how many species of mammals occur in Brazil, there has been a huge effort to assess this biodiversity. In this contribution, we present new records for rare species of the sigmodontine rodent genera and previously unknown to Brazilian Amazon. We provided detailed information on the morphologic variation to allow the proper identification of these species.