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Un reptil tirano sureño es un reptil tirano.

Roger B J Benson1, Paul M Barrett, Tom H Rich

  • 1Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, UK. rbb27@cam.ac.uk

Science (New York, N.Y.)
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Resumen
Este resumen es generado por máquina.

La evidencia fósil de Australia revela que los tiranosauroides, los antepasados de los tiranosauridos, se distribuyeron globalmente mucho antes de lo que se pensaba. Este hallazgo desafía la idea de que estos depredadores máximos estuvieran confinados al hemisferio norte durante el período Cretácico Temprano.

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Área de la Ciencia:

  • Paleontología Paleontología.
  • Paleontología de los vertebrados.
  • Los ecosistemas del Mesozoico

Sus antecedentes:

  • Los tiranosaurios fueron los depredadores máximos en el Cretácico Tardío, dominando Laurasia.
  • La evolución temprana y la distribución de los tiranosauroides son poco conocidas, con fósiles encontrados principalmente en el hemisferio norte.
  • El linaje de 100 millones de años que precede a los tiranosaurios sigue siendo en gran parte no documentado.

Objetivo del estudio:

  • Para investigar la distribución temprana y la evolución de los tiranosauroides.
  • Para determinar si los tiranosauroides estaban restringidos a Laurasia durante el Cretácico Temprano.
  • Para entender los orígenes del plan corporal de los tiranosaurios.

Principales métodos:

  • Análisis de un hueso púbico fosilizado del Cretácico Temprano de Victoria, Australia.
  • Comparación morfológica del fósil australiano con ejemplares conocidos de tiranosauroides y tiranosaurídeos.
  • Evaluación paleobiogeográfica basada en la evidencia fósil.

Principales resultados:

  • Descubrimiento de un espécimen de tiranosauroide australiano de finales del Cretácico temprano.
  • El espécimen exhibe una morfología tiranosauroide avanzada a pesar de su pequeño tamaño.
  • Este hallazgo indica que los tiranosauroides no eran exclusivos de Laurasia.

Conclusiones:

  • Los tiranosauroides del Cretácico temprano, caracterizados por brazos cortos y cráneos robustos, probablemente tuvieron una distribución global.
  • Un grado cosmopolita de pequeños tiranosaurídeos con un plan de cuerpo similar al de los tiranosaurídeos existía antes del surgimiento de los tiranosaurídeos gigantes.
  • Este fósil australiano proporciona evidencia crucial para la paleobiogeografía temprana de estos exitosos depredadores.