Abstract
We report the karyotypes of Reithrodontomys hirsutus and R. mexicanus from Oaxaca and Puebla, Mexico, and R. sumichrasti from Puebla and Veracruz, Mexico; the first is described for the first time and the latter 2 represent karyotypic variants from localities different from those previously reported. Our findings confirm the complex chromosomal evolution that has occurred within the genus Reithrodontomys and support molecular data indicating that an undescribed species inhabits the highlands of the Sierra Madre Oriental in Mexico. We also document chromosomal variation within R. sumichrasti congruent with phylogenetic patterns reported previously.
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