The dental size of the mastodon from Hidalgo is comparable to that of mastodons from the GulfĬoastal Plain and the Great Lakes region, whereas the limb dimensions are similar to those of the Watkins Glen Mastodon from the late Pleistocene of New York. americanum: well-developed tusks thatĬurved upward upper and lower molars with a simple occlusal pattern last molars with four to five lophs/ids a medial sulcus between the lophs/ids a scapula with a straight caudal border, a short and expanded neck, and a glenoid cavity that is oval in outline a short and robust humerus with a prominent epicondylar crest a radius with a wide distal end and an ulna with a well-developed olecranon process and a deep trochlear notch. The material from Hidalgo shows the following diagnostic features of M. The sample includes cranial and postcranial remains of an adult male that represents one of the most complete mastodons that have been found in Mexico, as well as a molar belonging to an old individual. This suggests that the assemblage of fossil species found inhabited the locality during a glacial period.įossil specimens of American mastodons (Mammut americanum) that have been recovered from fluvial sedimentary deposits of the late Pleistocene of southeastern Hidalgo, central Mexico, are formally described. A mean annual temperature of 13.91 ± 1.54 ☌ and an annual precipitation of 964.04 ± 316.82 mm were inferred for the locality.
Paleoclimate was reconstructed using the Mutual Ecogeographic Range method, which uses the distribution and climate niche of the nearest extant representatives of the identified fossil taxa. This finding suggests that the mastodon remains were used as burrow by the rattlesnake during the Pleistocene. triseriatus) was found inside the mandible of the American mastodon (Mammut americanum). in Mexico, and the first North American Pleistocene record for the rattlesnake Crotalus triseriatus. We present the first Mexican Pleistocene record of Anolis and Storeria, the third fossil record of the alligator lizard Barisia sp. In this study, we describe the fossil record of squamate reptiles from the Pleistocene of San José Buenavista (Puebla, Mexico), and the taphonomic relationship between them and the associated megafauna, as well as reconstruct the paleoclimate of the paleontological site in Central Mexico where the remains were found. Pleistocene reptiles have been used as a proxy for qualitative paleoclimatic reconstructions of localities. Taphonomic studies in Pleistocene reptiles are focused on finding out the origin of the paleontological remains that is, if the remains found at a particular place correspond to organisms that lived and died there or if they were carried out and deposited there by water currents or predators. However, reptile fossil records of Pleistocene from Latin America are scarce and limited to presence data associated with records of megafauna remains. Records of Pleistocene reptiles are relatively well known in different countries.
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