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1 October 2013 Thomomys nayarensis, a new species of pocket gopher from the Sierra del Nayar, Nayarit, Mexico
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The southern pocket gopher, Thomomys umbrinus, traditionally has been divided into as many as 5 genetically defined subclades based on chromosomal and allozymic data. Recent molecular analyses have resurrected 2 species from within these clades: 1 from the Pacific coastal lowlands (T. atrovarius), and another from the highlands of the Sierra Madre Occidental (T. sheldoni). In this study, multilocus genetic analyses of 3 mitochondrial and 5 nuclear genes reveal a previously unrecognized 3rd species apparently restricted to the Sierra del Nayar of northeastern Nayarit, Mexico. In addition to molecular and chromosomal studies of this new species, cranial morphology is analyzed to help distinguish it from its congeners. This taxon, T. nayarensis, is described herein, and a key to distinguishing the 3 species of Thomomys in northeastern Nayarit is provided.

La tuza sureña, Thomomys umbrinus, tradicionalmente ha sido dividida hasta en 5 subclados, definidos genéticamente con base en datos cromosómicos y de aloenzimas. Análisis moleculares recientes han resucitado 2 especies a partir de estos clados: 1 especie de las tierras bajas de la costa del Pacífico (T. atrovarius), y otra de las tierras altas de la Sierra Madre Occidental (T. sheldoni). En este estudio, análisis genéticos multilocus de 3 genes mitocondriales y 5 genes nucleares revelan una 3ra especie no descrita previamente, y aparentemente restringida a la Sierra del Nayar del noreste de Nayarit. Además de los estudios moleculares y cromosómicos de esta nueva especie, la morfología craneal es analizada para ayudar a distinguirla de sus congéneres. Este taxon, T. nayarensis, se describe aquí, y se proporciona una clave taxonómica para distinguir las 3 especies de Thomomys en el noreste de Nayarit.

Verity L. Mathis, Mark S. Hafner, David J. Hafner, and James W. Demastes "Thomomys nayarensis, a new species of pocket gopher from the Sierra del Nayar, Nayarit, Mexico," Journal of Mammalogy 94(5), 983-994, (1 October 2013).
Received: 15 January 2013; Accepted: 1 May 2013; Published: 1 October 2013

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