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Paleontología: plumas "modernas" en un dinosaurio no aviar
Mark Norell1, Qiang Ji, Keqin Gao
1American Museum of Natural History, Central Park West at 79th Street, New York, New York 10024-5192, USA. norell@amnh.org
Nature
|March 8, 2002
Resumen
Las plumas con un eje central y barbas fueron encontradas en un dinosaurio no aviar. Este descubrimiento muestra que las plumas complejas evolucionaron antes de las aves y el vuelo.
Área de la Ciencia:
- Paleontología Paleontología.
- Biología evolutiva Biología evolutiva.
- Paleontología de dinosaurios Paleontología de dinosaurios
Sus antecedentes:
- Los descubrimientos de cubiertas integumentarias de dinosaurios son frecuentes.
- La evidencia definitiva de plumas de tipo moderno se limitaba anteriormente a unas pocas especies específicas.
Objetivo del estudio:
- Para describir la aparición de plumas avanzadas en un dinosaurio terópodo no aviar.
- Para determinar la línea de tiempo evolutiva del desarrollo de las plumas en los dinosaurios.
Principales métodos:
- Excavación y análisis de fósiles.
- Examen microscópico de las estructuras integumentarias.
Principales resultados:
- Las plumas de piñón, con un rachis y barbas, fueron identificadas en un pequeño dromaeosaurio no aviar de China.
- Estas plumas son similares en estructura a las que se encuentran en las aves modernas.
Conclusiones:
- Las plumas de aspecto moderno evolucionaron en los dinosaurios antes del origen de las aves.
- La evolución de las plumas es anterior al desarrollo del vuelo aviar.
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