Tooth replacement in a sauropod premaxilla from the Upper Cretaceous of Patagonia, Argentina

Rodolfo A. Coria, Luis M. Chiappe


Anatomy and tooth replacement mechanism observed in a sauropod dinosaur left premaxilla from the Late Cretaceous of Patagonia are described. The specimen is assigned to Neosauropoda, and with doubts to Titanosauridae, due the presence of a stepped anterior margin, and long and cylindrical teeth with no denticles. The specimen presents a dental settlement pattern performed by intra-alveolar packages of four dental elements, one functional and three germinals, which compose a comb-like arrangement only recorded in diplodocid and titanosaurid sauropods.

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