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El primer huevo de dinosaurio fue suave.

Mark A Norell1, Jasmina Wiemann2, Matteo Fabbri3

  • 1Division of Vertebrate Paleontology, American Museum of Natural History, New York, NY, USA. norell@amnh.org.

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|June 20, 2020
PubMed
Resumen
Este resumen es generado por máquina.

Los primeros huevos de dinosaurio eran de cáscara blanda, desafiando las suposiciones anteriores basadas en aves y reptiles modernos. Este descubrimiento sugiere que los huevos de dinosaurio con cáscara dura evolucionaron varias veces de forma independiente.

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Área de la Ciencia:

  • Paleontología
  • Biología evolutiva
  • La biomineralización

Sus antecedentes:

  • Las aves y cocodrilos modernos ponen huevos de cáscara dura, lo que lleva a la inferencia de que los dinosaurios no aviares tenían cáscaras de huevo duras.
  • Las cáscaras de huevo de dinosaurio conocidas exhiben una estructura calcítica con capas ultrastructuralmente distintas y configuraciones de poros entre los principales clados.
  • El registro fósil de las cáscaras de huevos de dinosaurios es escaso, lo que dificulta una comprensión completa de su evolución y homología.

Objetivo del estudio:

  • Investigar la composición original y la ultrastructura de las cáscaras de huevo de dinosaurios excepcionalmente conservados de Protoceratops y Mussaurus.
  • Para determinar si estos huevos de dinosaurio eran de cáscara dura o de cáscara blanda.
  • Para reconstruir la historia evolutiva de la composición y estructura de la cáscara de huevo de dinosaurio.

Principales métodos:

  • Se realizaron análisis mineralógicos, orgánicos y ultrastructurales en cáscaras de huevo fósiles.
  • La espectroscopia Raman in situ se utilizó para analizar la composición de las cáscaras de huevo fósiles y existentes.
  • El examen histológico y la reconstrucción del estado ancestral se emplearon para comparar las estructuras de la cáscara de huevo.

Principales resultados:

  • Los huevos de Protoceratops y Mussaurus excepcionalmente conservados muestran evidencia de una naturaleza originalmente no biomineralizada y de cáscara blanda.
  • La espectroscopia Raman y la histología indican una composición orgánica para estos huevos de dinosaurio, similar a los huevos de tortuga de cáscara blanda.
  • La reconstrucción del estado ancestral sugiere que el primer huevo de dinosaurio tenía una cáscara blanda.

Conclusiones:

  • Los primeros antepasados de los dinosaurios ponían huevos de cáscara blanda.
  • Los huevos de dinosaurio calcificados y de cáscara dura evolucionaron independientemente al menos tres veces durante la era Mesozoica.
  • Este patrón evolutivo explica la prevalencia de los fósiles de huevos de dinosaurio con cáscara dura.