Abstract
The genus Ctenomys comprises approximately 70 recognized living species of subterranean rodents endemic to South America. Phylogenetic studies to date, based on mitochondrial DNA data, place 44 recognized species in eight species groups and provide evidence for a burst of speciation early in the history of the genus. Species from Argentina, Uruguay, Bolivia, and southern Brazil are well studied at the phylogenetic level. However, the taxonomic status of the species inhabiting midwest and northern Brazil remains poorly understood. In this study, we construct phylogenies based on maximum likelihood and Bayesian inference methods with cytochrome b gene haplotypes of Ctenomys from midwest and northern Brazil and with haplotypes representative of the genus Ctenomys to place the sampled haplotypes into a phylogenetic framework; we also evaluate skull geometric morphometrics data among sampling sites to assess whether skull morphology corroborates the phylogenetic patterns observed. The results show that the sampling sites used in this study are represented by two species, namely, Ctenomys bicolor, which is present in the state of Rondônia, and Ctenomys nattereri, which is present in Mato Grosso and Bolivia. The results also reveal two lineages of Ctenomys distinct from C. bicolor and C. nattereri, henceforth called Ctenomys sp. “xingu” and Ctenomys sp. “central.” Both the species and lineages share a most recent common ancestor with C. boliviensis and are part of the boliviensis species group.
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Acknowledgments
We thank all colleagues from the Laboratory of Cytogenetics and Evolution (LACE) for their invaluable support in reviewing this manuscript. We also thank Professors Andreia Turchetto, Gislene Lopes Gonçalves, and Renan Maestri for reviewing the methods, results, and discussion sections of this paper. L.T.L. and L.E.J.R. received scholarships from the Comissão de Aperfeiçoamento de Pessoal de Nível Técnico e Superior (CAPES), and T.R.O.F. received research grants from CAPES, Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) and Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul (FAPERGS).
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Leipnitz, L.T., Fornel, R., Ribas, L.E.J. et al. Lineages of Tuco-Tucos (Ctenomyidae: Rodentia) from Midwest and Northern Brazil: Late Irradiations of Subterranean Rodents Towards the Amazon Forest. J Mammal Evol 27, 161–176 (2020). https://doi.org/10.1007/s10914-018-9450-0
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DOI: https://doi.org/10.1007/s10914-018-9450-0