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The Neogene strata of the Solimões Formation (northern Brazil) have revealed an astonishing diversity of extinct caviomorph rodents. The main exposures of this formation are found along the Juruá, Acre, and Purus rivers, and some road cuts in the State of Acre. In this paper, we reported a new locality containing a rodent assemblage. The outcrop (Coqueiro locality) is located in the Envira River, central region of State of Acre, Brazil. During fieldwork in 2010 and 2019, several isolated cheek teeth and bones of mammals were recovered in conglomeratic levels from this locality. Here, we described specimens assigned to  Cardiatherium  sp. (Caviidae: Hydrochoerinae),  Potamarchus  sp. and cf.  Pseudopotamarchus  (Dinomyidae: Potamarchinae), and  Neoepiblema  sp. (Neoepiblemidae). The locality is not yet dated by radiometric methods but based on the biostratigraphic information of the taxa here reported, we suggest that the fossil-bearing levels of this locality were deposited during the Late Miocene.

A new Late Miocene hystricognath rodent assemblage (Caviidae, Dinomyidae, and Neoepiblemidae) from northern Brazil and its biostratigraphic relevance