A MESOZOIC DINO-FEAST: MULTIPLE TEETH MARKS ON A SAUROPOD DINOSAUR BONE FROM THE UPPER CRETACEOUS OF PATAGONIA AND EVIDENCE ON THEROPOD FEEDING BEHAVIOR
Un festín mesozoico: múltiples marcas de dientes en un hueso de dinosaurio saurópodo del Cretácio Superior de Patagonia y evidencias sobre comportamiento de alimentación de terópodos
DOI:
https://doi.org/10.5710/PEAPA.22.09.2024.512Palabras clave:
Marcas de dientes, Marcas de alimentación, Interacción trófica, Roer, Mamífero cretácicoResumen
Las marcas de dientes en los huesos son evidencias utilizadas para inferir interacciones tróficas. En los dinosaurios carnívoros, esta evidencia es rara en el registro fósil. Describimos aquí un fragmento de hueso apendicular de saurópodo que exhibe marcas de dientes consistentes con múltiples productores de trazas. El especimen MPM-PV-19111 proviene de rocas del Cretácico aflorantes en la localidad de Cerro Fortaleza (Formación Cerro Fortaleza, Campaniano–Maastrichtiano), Provincia de Santa Cruz, Argentina. Conserva tres caras, dos con surcos y una tercera con “pits” poco profundos. Hay aproximadamente 100 impresiones (identificamos al menos 99 surcos y unos 19 “pits”), con surcos más o menos perpendiculares al eje principal del hueso. Los surcos varían de 1 a 3,5 mm de ancho y generalmente se estrechan distalmente. Los pits son circulares a subcirculares y de diámetro variable (1,5–4,00 mm). Estas trazas de alimentación son atribuibles a dinosaurios terópodos -abelisáuridos y megaraptóridos se registraron en la formación- de tamaño mediano a grande, cocodrilos notosúquidos y un posible pequeño mamífero indeterminado. Las marcas se consideran post-mortem debido a la ausencia de cicatrización del hueso circundante. El elevado número de marcas de dientes indica tanto mordidas fuertes y repetidas en un área restringida (¿comportamiento similar al de roer?), como también múltiples productores que probablemente mordieron el hueso en diferentes momentos, ya que los animales de menor tamaño intentarían evitar a los más grandes durante el proceso. Este estudio tiene como objetivo describir e interpretar el posible origen de las marcas conservadas en el ejemplar.
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