RESTOS DE ALLOSAUROIDEO (ThEROPODA, TETANURAE) DE LA FORMACIÓN SIERRA BARROSA (CONIACIANO MEDIO, CRETÁCICO SUPERIOR), PATAGONIA, ARGENTINA

Autores/as

  • Mattia Antonio Baiano Consejo Nacional de Investigaciones Científicas y Técnicas
  • Leonardo Sebastián Filippi Museo Municipal Argentino Urquiza

DOI:

https://doi.org/10.5710/PEAPA.25.10.2021.396

Palabras clave:

Cretácico Superior, Grupo Neuquén, América del Sur, Patagonia, Dinosauria, Allosauroidea, Tibia

Resumen

La fauna de terópodos del Cretácico Tardío de América del Sur está compuesta por Abelisauridae, Noasauridae, Carcharodontosauridae, Spinosauridae, Megaraptora y Coelurosauria. Estos grupos incluyen mayormente taxones de pequeño (Noasauridae y Coelurosauria) y de mediano a gran tamaño (Abelisauridae, Carcharodontosauridae y Megaraptora). Algunos de estos linajes son predominantemente gondwánicos (Abelisauridae, Noasauridae, Carcharodontosauridae, Megaraptora) y poco representados en los continentes laurásicos. Particularmente, distintos terópodos han sido reportados desde la Patagonia, conocidos o por sus distintivas características anatómicas o por su grado de preservación, tales como Carnotaurus, Skorpiovenator, Giganotosaurus, Megaraptor, Alvarezsaurus y Unenlagia. Aquí describimos una nueva tibia incompleta (MAU-PV-CM-653) proveniente de la Formación Sierra Barrosa (Coniaciano medio, Cretácico Superior), Patagonia, Argentina. MAU-PV-CM-653 muestra una cresta cnemial reducida anteroposteriormente, que está fuertemente curvada lateralmente. Finalmente, la tibia carece de una extensión proximal de la cresta fibular. Estos rasgos hacen recordar una morfología de tetanuro y, junto con la procedencia estratigráfica de MAU-PV-CM-653, nos permite asignarla a un terópodo allosauroideo, y por ende mejorar el registro global de Allosauroidea para la parte media del Cretácico Tardío.

Citas

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01/26/2022

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