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Un extraño dinosaurio depredador del Cretácico tardío de Madagascar
S D Sampson1, M T Carrano, C A Forster
1Utah Museum of Natural History and Department of Geology and Geophysics, University of Utah, Salt Lake City 84112-0050, USA. ssampson@umnh.utah.edu
Nature
|February 24, 2001
Resumen
Un nuevo dinosaurio depredador, Masiakasaurus knopfleri, fue descubierto en Madagascar. Este pequeño terópodo presenta dientes únicos que apuntan hacia adelante, previamente desconocidos en los dinosaurios, lo que sugiere una distribución más amplia de reptiles antiguos.
Área de la Ciencia:
- Paleontología Paleontología.
- Zoología de los vertebrados Zoología de los vertebrados.
- Biología evolutiva Biología evolutiva.
Sus antecedentes:
- El período Cretácico tardío vio una diversa fauna de dinosaurios en toda Gondwana.
- Los abelisauroides fueron un grupo significativo de dinosaurios terópodos, principalmente conocidos de especies más grandes.
- Los abelisauroides de cuerpo pequeño solo se habían documentado previamente en Argentina.
Objetivo del estudio:
- Para informar sobre el descubrimiento de una nueva especie de dinosaurio de Madagascar.
- Para describir las características dentales y esqueléticas únicas de este nuevo terópodo.
- Para inferir las implicaciones evolutivas y biogeográficas de este hallazgo.
Principales métodos:
- Excavación y análisis de cráneo fosilizado y restos postcraneales.
- Estudio anatómico comparativo con taxones de dinosaurios conocidos.
- Análisis filogenético para determinar las relaciones taxonómicas.
Principales resultados:
- El descubrimiento de Masiakasaurus knopfleri, un pequeño (aprox. 1,8 m) fue un dinosaurio depredador.
- Heterodoncia única y dentición inferior procumbente, sin precedentes en los terópodos.
- Las características del esqueleto confirman Masiakasaurus como un miembro del clado Abelisauroidea.
Conclusiones:
- Masiakasaurus knopfleri representa un nuevo género y especie de terópodo abelisauroide de Madagascar.
- Su dentadura única ofrece nuevos conocimientos sobre las estrategias de alimentación de los terópodos y la evolución dental.
- El descubrimiento amplía el rango geográfico conocido de abelisauroides de cuerpo pequeño, lo que indica una distribución y diversificación más amplias de Gondwana.
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