Journal of Iberian Geology

, Volume 43, Issue 2, pp 235–243

The conservative structure of the ornithopod eggshell: electron backscatter diffraction characterization of Guegoolithus turolensis from the Early Cretaceous of Spain

  • Miguel Moreno-Azanza
  • Blanca Bauluz
  • José Ignacio Canudo
  • Octávio Mateus
Research Article

Abstract

Introduction

The Spheroolithidae oospecies Guegoolithus turolensis, putatively attributed to non-hadrosauroid styracosterns was first described in the Barremian of the Iberian Basin, and later reported in the Valanginian–Hauterivian of the Cameros Basin, with both occurrences separated by a few hundred kilometres but by over 10 million years.

Methods

Here we apply electron backscatter diffraction to search for crystallographic and ultrastructural differences between both occurrences of this ootaxon.

Results

Not only did not we found significant differences between eggshells from the two basins, probably laid by different non-hadrosauroid styracostern species but also, we found significant similitudes with the Late Cretaceous Maiasaura eggshells from North America. All Spheroolithidae eggshells are characterized by a profusion of low angle misorientation boundaries within larger orientation domains, that fan out from the eisospherite. A very quick reorientation of the c-axis of the crystals is observed, and explained partially via competitive growth.

Conclusions

This conservative eggshell architecture suggests that the physical properties of the eggshell of styracosterns remain unchanged for at least 80 million years, implying similar nesting and breeding behaviours.

Keywords

EBSD Spheroolithidae Barremian Valanginian–Hauterivian Maestrazgo basin Cameros basin Dinosaur 

Resumen

Introducción

La ooespecie Guegoolitus turolensis de la oofamilia Spheroolithidae, atribuida putativamente a dinosaurios estiracosternos no hadrosauridos, fue descrita en el Barremiense de la Cuenca Ibérica, y posteriormente identificada en el Valanginiese-Hauteriviense de la Cuenca de Cameros, dos hallazgos separados por unos cientos de kilómetros, pero por más de diez millones de años.

Métodos

En este trabajo utilizamos difracción de electrones dispersados para identificar posibles diferencias cristalográficas y ultraestructurales entre especímenes de estas dos localidades.

Resultados

No solo no hemos encontrado diferencias significativas entre las cáscaras de ambas cáscaras, probablemente pertenecientes a huevos puestos por diferentes especies de estiracosternos no hadrosauridos; además hemos identificado similitudes importantes con cáscaras de huevo de Maiasaura, del Cretácico Tardío de Norteamérica. Todas las cáscaras de Spheroolithidae están caracterizadas por una abundancia de fronteras de desorientación de bajo ángulo, incluidas en dominios de orientación más grandes, que radian desde los eisosferitos. Hemos observado en todas las cáscaras una reorientación muy rápida de los ejes c, explicada parcialmente mediante crecimiento competitivo.

Conclusiones

Esta arquitectura de la cáscara tan conservativa sugiere que las propiedades físicas de las cáscaras de estiracosternos permanecieron invariables durante al menos ochenta millones de años, implicando comportamientos de nidificación y crianza similares.

Palabras clave

EBSD Spheroolithidae Barremiense Valanginiense–Hauteriviense Cuenca del Maestrazgo Cuenca de Cameros Dinosaurio 

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Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  1. 1.Geobiotec, Departamento de Ciências da Terra, Faculdade de Ciências e Tecnologia, FCTUniversidade Nova de LisboaCaparicaPortugal
  2. 2.Grupo Aragosaurus-IUCA, Área de PaleontologíaUniversidad de ZaragozaSaragossaSpain
  3. 3.Mineralogía y Cristalografía, Facultad de CienciasUniversidad de ZaragozaSaragossaSpain
  4. 4.Museu da LourinhãLourinhãPortugal

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