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Sorting specimens at the Museum National d’Histoire Naturelle, Paris, we recovered a presumable specimen of  Amphinectomys ; to assess its identity, we compared this new specimen with the holotype of  Amphinectomys savamis  and with a syntopic sample of  Nectomys apicalis . The Ecuadorean  Amphinectomys  differs discretely from the holotype in a few cranio-dental traits and from  N. apicalis  in many and more evident traits. The holotype is larger than the new specimen, and neither specimen of  Amphinectomys  has similar proportional dimensions in comparison with  N. apicalis . Therefore, we identified the Ecuadorean specimen as  A. savamis , acknowledging some level of intraspecific geographic variation and extending its current known distribution northwestwards.

On the rare species Amphinectomys savamis Malygin 1994 (Rodentia, Cricetidae, Sigmodontinae): new record and morphological considerations