Late Hemphilian Mammals of the Ocote Local Fauna, Guanajuato, Mexico

The Ocote local fauna is described from several thousand fossils, mostly isolated teeth, of large mammals, obtained from sediments near the village of Los Rodriguez, District of San Miguel de Allende, northeast of the city of San Miguel de Allende, Guanajuato, Mexico. Teleoceras ocotensis, Desrnathyus brachydontus, and Palaeolama guanajuatensis are described as new, the name Paenemarmota Mexicana (Wilson) is revived, and descriptions of the dentitions of six species of horses are given. It is suggested that the Pliocene evolution of Desrnathyus and Palaeolama took place on the Mexican Plateau. The evolutionary stage of the Ocote mammals suggests that the fauna is of late Hemphillian age.