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Un nuevo dinosaurio troodóntido de China con una postura de sueño parecida a la de las aves
1Institute of Vertebrate Paleontology & Paleoanthropology, Chinese Academy of Sciences, PO Box 643, Beijing 100044, China. xu@amnh.org
Nature
|October 16, 2004
Resumen
La evidencia fósil revela un nuevo dinosaurio troodontido que exhibe una postura de sueño parecida a la de un pájaro. Este descubrimiento sugiere que los comportamientos de las aves estaban presentes en los dinosaurios no aviares mucho antes de lo que se pensaba.
Área de la Ciencia:
- Paleontología Paleontología.
- Biología evolutiva Biología evolutiva.
- Paleontología de los Vertebrados.
Sus antecedentes:
- La evidencia de comportamiento en vertebrados fosilizados es excepcionalmente rara.
- Los comportamientos estereotipados, particularmente los observados en las aves existentes (aviares), rara vez se encuentran en los dinosaurios no aviares.
Objetivo del estudio:
- Para informar sobre el descubrimiento de un nuevo dinosaurio troodóntido de la Formación Yixian del Cretácico Temprano.
- Presentar evidencia de comportamiento en este nuevo taxón que se relaciona con los comportamientos aviares existentes.
- Para investigar la evolución temprana de las características parecidas a las aves en los dinosaurios.
Principales métodos:
- Excavación y análisis de un nuevo espécimen fósil de troodontida.
- Estudio anatómico comparativo de la postura del fósil con las posiciones de sueño / descanso de las aves existentes.
- Contexto geológico y paleontológico de la Formación Yixian.
Principales resultados:
- Descubrimiento de un nuevo taxón de dinosaurios troodóntidos.
- El espécimen se conserva en una postura estereotipada para dormir o descansar, característica de las aves existentes.
- Esta postura no se había predicho previamente en dinosaurios no avianos.
Conclusiones:
- El fósil proporciona evidencia conductual directa fuera del grupo de la corona Aves.
- Este hallazgo apoya la hipótesis de que muchas características de las aves evolucionaron temprano en la evolución de los dinosaurios.
- La postura del troodóntido ofrece información sobre los orígenes de las aves.
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