Preliminary assessment of hadrosaur dental microwear from the Cerro del Pueblo Formation (Upper Cretaceous: Campanian) of Coahuila, northeastern Mexico

Héctor E. Rivera-Sylva, Christina I. Barrón-Ortízb, Rafael l Vivas González, Rosalba Lizbeth Nava Rodríguez, José Rubén Guzmán-Gutiérreza, Fernando Cabral Valdez, Claudio de León Dávila

Resumen


Here we report new hadrosaur remains recovered from the Cerro del Pueblo Formation (Upper Cretaceous: Campanian) at La Parrita
locality, northeastern Mexico. Although the material is fragmentary, the identification of dental microwear in three out of the four teeth
collected is notable. This sample allows for a preliminary assessment of hadrosaur dental microwear from this geographic region and
time frame. The variables studied were the orientation and average count of scratches, average count of pits, and average microwear
feature width in an area of 400 X 400 μm at 35X magnification. The results show a predominance of dorsodistally-ventromesially
inclined scratches in all three teeth indicating that the mandible primarily moved in an orthopalinal direction during the power stroke.
The pattern of scratch orientation we recorded is comparable to that reported for different hadrosaur species from Alberta, Canada,
and Wyoming, U.S.A.; suggesting similar jaw mechanics in the hadrosaurs from Coahuila. In contrast, there are significant differences
in the average number of pits and microwear feature width between the Alberta and the Coahuila hadrosaurs samples, with the latter
presenting more pits and finer microwear features. Given the similar jaw mechanics between the Alberta and Coahuila hadrosaurs,
suggested by our analysis, the difference in average number of pits and microwear feature width is probably due to differences in diet
and/or the type and amount of grit ingested during feeding. The greater number of pits in the hadrosaurs from Coahuila might indicate
that these individuals ingested a greater proportion of hard food items than the Alberta hadrosaurs.


Palabras clave


Palaeogeography; Palaeoecosystem; Hadrosauridae; microwear; Coahuila; Mexico

Texto completo:

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