The genus Abrawayaomys Cunha and Cruz, 1979 (Rodentia: Cricetidae: Sigmodontinae): geographic variation and species definition

Autor(es)

Percequillo, Alexandre Reis ; de Carvalho Braga, Caryne Aparecida ; Brandao, Marcus Vinicius ; de Abreu-Junior, Edson Fiedler ; Gualda-Barros, Juliana ; Lessa, Gisele M. ; Silverio Pires, Maria Rita ; Hingst-Zaher, Erika

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF MAMMALOGY; v. 98, n. 2, p. 438-455, MAR 21 2017.
• Citações Web of Science: 3

Resumo

Abrawayaomys is a genus endemic to the Atlantic Forest with unique craniodental attributes within the radiation of sigmodontine rodents. Recent data hypothesized the existence of 2 species of Abrawayaomys, namely A. ruschii (from the Brazilian states of Espfrito Santo, Rio de Janeiro, and Sao Paulo) and A. chebezi (from the Argentinean province of Misiones and the Brazilian state of Parana), as well as a possible undescribed species (from the Brazilian state of Minas Gerais). Herein, based on a large series of recently collected specimens, we assessed the congruence between morphologic and molecular characters to search for discontinuities on these features across geography to delimit species within the genus, testing the aforementioned hypothesis. Morphological analyses, both qualitative and quantitative, showed that all characters are polymorphic throughout the geographic range of the genus. Results from phylogenetic analyses of cytochrome b (Cytb) data showed the topology (Misiones (Minas Gerais (Sao Paulo, Rio de Janeiro))), which is better explained as geographic rather than taxonomic variation, based on low values of genetic divergence observed between all specimens. Therefore, we reject the hypothesis of a polytypic Abrawayaomys, synonymizing A. chebezi to A. ruschii, and do not recognize specimens from Minas Gerais state as representing a distinct species. (AU)

• Processo FAPESP: 08/53522-6 - Atlas craniano dos mamiferos brasileiros.
• Beneficiário: Marcus Vinicius Brandão de Oliveira
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 10/14633-7 - Pequenos mamíferos não-voadores da Estação Ecológica de Bananal: diversidade e história natural
• Beneficiário: Edson Fiedler de Abreu Júnior
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 09/16009-1 - Sistemática, evolução e diversificação da subfamília Sigmodontinae na América do Sul: a tribo Oryzomyini
• Beneficiário: Alexandre Reis Percequillo
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores