Phylogenetic relationships of the pygmy rice rats of the genus Oligoryzomys Bangs, 1900 (Rodentia: Sigmodontinae) |
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| Authors: | R EDUARDO PALMA ENRIQUE RODRÍGUEZ‐SERRANO ERIC RIVERA‐MILLA CRISTIAN E HERNANDEZ JORGE SALAZAR‐BRAVO MARIA I CARMA SEBASTIAN BELMAR‐LUCERO PABLO GUTIERREZ‐TAPIA HORACIO ZEBALLOS TERRY L YATES |
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| Institution: | 1. Departamento de Ecología and Centro de Estudios Avanzados en Ecología y Biodiversidad, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Casilla 114‐D, Santiago 6513677, Chile;2. Molecular Genetic Group, Leibniz Institute for Age Research, Fritz Lipmann Institute, Beutenbergstrasse 11, 07745 Jena, Germany;3. Departamento de Zoología, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Concepción, Chile;4. Department of Biological Sciences, Texas Tech University, Lubbock TX 79409‐3131, USA;5. Cátedra de Diversidad Animal II, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Catamarca, Av. Belgrano 300, 4700 Catamarca, Argentina;6. Department of Biology and Museum of Southwestern Biology, University of New Mexico, Albuquerque, NM 87131‐1091, USA |
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| Abstract: | Sequences from two mitochondrial genes (cytochrome b and NADH1) were used to produce a molecular phylogeny for 12 named and two undescribed species of the genus Oligoryzomys. All analyses placed Oligoryzomys microtis as the most basal taxon, a finding consistent with previous studies that suggested the west‐central Amazon as a centre of origin for the tribe Oryzomyini to which Oligoryzomys belongs. Biogeographically, this suggests that Oligoryzomys had a South American origin, and later advanced northwards, entering Central America and Mexico more recently. Different analyses have provided consistent support for several additional clades that did not necessarily agree with the species groups hypothesized by previous studies. A molecular clock derived for these data suggests an origin for the genus of 6.67 Mya, with most speciation within the genus occurring between 3.7 and 1.5 Mya. © 2010 The Linnean Society of London, Zoological Journal of the Linnean Society, 2010, 160 , 551–566. |
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| Keywords: | cytochrome b NADH1 Neotropics phylogeny |
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