The Guiana Shield has large, preserved areas with high biological diversity. However, the knowledge of this biodiversity differs among the regions with the Brazilian portion poorly known compared to the French Guiana, Suriname, Guyana, and Venezuela. In the Amapá State, the information on mammals is very heterogeneous and represents a gap in the knowledge of the distribution and diversity of some groups. We compiled a list of the mammals of the Amapá based on the inventories, voucher specimens deposited in the collection Fauna of Amapá at Instituto de Pesquisas Científicas e Tecnológicas do Estado do Amapá, and previous published studies. We present a list of 181 mammal species. Chiroptera was the order with the highest number of species (88) followed by Rodentia (32). The list includes 17 new occurrences: 16 for Amapá (five marsupials, eight bats, one canid, one cetacea and one rodent) and one for Brazil (one rodent). This species list is the most complete taxonomic review for the Amapá, contributes to the knowledge of mammal diversity north of the Amazon River, and helps increase the precision of the species ranges in the Guianas and the eastern portion of the Amazon.
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