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Type: Article
Published: 2022-11-10
Page range: 401-435
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A new species of Akodon Meyen, 1833 (Rodentia: Cricetidae) from dry forests of the Amazonia-Cerrado transition

Programa de Pós-Graduação em Sistemática, Taxonomia Animal e Biodiversidade, Museu de Zoologia; Universidade de São Paulo; Av. Nazaré 481; Ipiranga; 04263-000; São Paulo, SP; Brazil. Laboratório de Diversidade Animal/Sistemática de Mamíferos; Departamento de Biologia; Universidade Federal de São Carlos, Campus Sorocaba; Rodovia João Leme dos Santos, Km 110 (SP-264); Itinga; 18052-780; Sorocaba; SP; Brazil. Laboratório de Mamíferos; Departamento de Ciências Biológicas; Escola Superior de Agricultura “Luiz de Queiroz” Universidade de São Paulo; Av. Pádua Dias, 11; Caixa Postal 9; 13418-900; Piracicaba; SP; Brazil
Laboratório de Diversidade Animal/Sistemática de Mamíferos; Departamento de Biologia; Universidade Federal de São Carlos, Campus Sorocaba; Rodovia João Leme dos Santos, Km 110 (SP-264); Itinga; 18052-780; Sorocaba; SP; Brazil
Laboratório de Mamíferos; Departamento de Ciências Biológicas; Escola Superior de Agricultura “Luiz de Queiroz” Universidade de São Paulo; Av. Pádua Dias, 11; Caixa Postal 9; 13418-900; Piracicaba; SP; Brazil
Programa de Pós-Graduação em Biologia, Laboratório de Genética e Biologia Molecular, Universidade do Vale do Rio dos Sinos, Centro de Ciência da Saúde, Av. Unisinos Cristo Rei; 93022-750, São Leopoldo; RS; Brazil
Laboratório de Ecologia e Zoologia de Vertebrados (LABEV), Instituto de Ciências Biológicas, Universidade Federal do Pará; Rua Augusto Corrêa, 01; 66075-110; Belém; PA; Brazil
Laboratório de Mastozoologia; Instituto de Biologia; Universidade do Estado do Rio de Janeiro; Rua São Francisco Xavier, 528; Maracanã; 20550-900; Rio de Janeiro; RJ; Brazil
Mammalia Akodontini Biodiversity Brazil Grass mouse Rodent Taxonomy


Akodon is the most diverse genus of the tribe Akodontini, comprising 41 extant species. Although distributed in a wide range of environments in South America, the genus was long considered to be absent from Amazon Forest. Nonetheless, in recent decades, records of Akodon have been reported based on specimens from southern Amazonia, throughout the contact zone with Cerrado. Published data about the unique karyotype (2n=10), along with evidence of sister phylogenetic relationship (Cytb sequences) with Akodon cursor, a species from the Atlantic Forest, suggest that these specimens represent an undescribed species. Herein we hypothesize that these samples represent a new species of Akodon from Amazonia-Cerrado transitional areas. Through the analyses of 217 specimens from Mato Grosso and Pará states, Brazil, as well as 336 specimens of Akodon cursor species group from the Atlantic Forest, we provide qualitative and quantitative external and craniodental data that support their distinction in comparison with other congeners. The sister relationship between this new species and A. cursor provide additional evidence of a past connection between the two largest tropical forests of South America. Moreover, the recognition of Akodon n. sp. points to the presence of the genus in the Amazonia-Cerrado transition, an area currently under great anthropic pressure, highlighting the fact that we might be losing a portion of Brazilian biodiversity before even getting to know it.



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