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Los grandes mamíferos del Mesozoico se alimentaban de dinosaurios jóvenes
Yaoming Hu1, Jin Meng, Yuanqing Wang
1Institute of Vertebrate Paleontology & Paleoanthropology, Chinese Academy of Sciences, PO Box 643, Beijing 100044, China. yhu@amnh.org
Nature
|January 15, 2005
Resumen
Los mamíferos del Mesozoico, como Repenomamus, eran más grandes y más diversos de lo que se pensaba anteriormente. Algunas especies carnívoras incluso se alimentaban de dinosaurios juveniles, desafiando a sus predecesores.
Área de la Ciencia:
- Paleontología Paleontología.
- Zoología de los vertebrados Zoología de los vertebrados.
Sus antecedentes:
- Los mamíferos del Mesozoico a menudo se representan como pequeñas criaturas insectívoras eclipsadas por los dinosaurios.
- El mamífero mesozoico más grande conocido con restos sustanciales es Repenomamus robustus.
Objetivo del estudio:
- Para describir una nueva y más grande especie de Repenomamus.
- Investigar la dieta y el papel ecológico de los mamíferos del Mesozoico.
Principales métodos:
- Descripción de una nueva especie de mamífero fósil basada en un esqueleto articulado casi completo.
- Análisis del contenido del estómago de un espécimen de Repenomamus robustus.
Principales resultados:
- Se descubrió una nueva especie de Repenomamus, significativamente más grande que R. robustus.
- La evidencia fósil reveló un Psittacosaurus juvenil (dinosaurio) en el contenido del estómago de R. robustus.
- Esto proporciona la primera evidencia directa de mamíferos carnívoros triconodontes que se alimentan de pequeños vertebrados, incluidos los dinosaurios.
Conclusiones:
- Los mamíferos del Mesozoico exhibieron una mayor diversidad en el tamaño corporal de lo que se entendía anteriormente.
- Algunos grandes mamíferos del Mesozoico eran carnívoros y ocupaban diversos nichos ecológicos, potencialmente compitiendo con los dinosaurios.
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