Merychippus (Mammalia, Perissodactyla, Equidae) from the Middle Miocene of state of Oaxaca, southeastern Mexico |
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Authors: | Victor Manuel Bravo-Cuevas Ismael Ferrusquía-Villafranca |
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Institution: | a Centro de Investigaciones Biológicas, Museo de Paleontología, Universidad Autónoma del Estado de Hidalgo, Ciudad Universitaria, s/n, CP 42184, Pachuca Hidalgo, México b Instituto de Geología, Universidad Nacional Autónoma de México, Ciudad Universitaria CP 04510, México D.F., México |
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Abstract: | Mexican material referable to Merychippus from two localities in eastern Oaxaca was described first nearly 50 years ago. Subsequent work there and in Central Oaxaca, spanning some 30 years, has allowed to establish the detail stratigraphy in both regions, and assembled a collection of merychippine material from the Matatlán (Central Oaxaca) and El Camarón (eastern Oaxaca) Formations, both K-Ar dated ~15 Ma (late early Barstovian). Detailed taxonomic analysis of this collection indicate the presence of two subhypsodont horse species referable to “Merychippus” cf. “M.” primus and “M.” cf. “M.” sejunctus in both regions. These records document the coexistence in tropical southern North America of basal and hipparionine affinity merychippine grade species, and provide a glimpse in to the diversity of subhypsodont equids in this region. |
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Keywords: | Equidae Merychippus Middle Miocene Southeastern Mexico |
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