3-D modelling of megaloolithid clutches: insights about nest construction and dinosaur behaviour.

<h4>Background</h4>Megaloolithid eggs have long been associated with sauropod dinosaurs. Despite their extensive and worldwide fossil record, interpretations of egg size and shape, clutch morphology, and incubation strategy vary. The Pinyes locality in the Upper Cretaceous Tremp Formatio...

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Autores principales:	Bernat Vila, Frankie D Jackson, Josep Fortuny, Albert G Sellés, Angel Galobart
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2010
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/bb4a01ca75124006a15712ea3889fae9
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spelling	oai:doaj.org-article:bb4a01ca75124006a15712ea3889fae92021-12-02T20:21:55Z3-D modelling of megaloolithid clutches: insights about nest construction and dinosaur behaviour.1932-620310.1371/journal.pone.0010362https://doaj.org/article/bb4a01ca75124006a15712ea3889fae92010-05-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/20463953/?tool=EBIhttps://doaj.org/toc/1932-6203<h4>Background</h4>Megaloolithid eggs have long been associated with sauropod dinosaurs. Despite their extensive and worldwide fossil record, interpretations of egg size and shape, clutch morphology, and incubation strategy vary. The Pinyes locality in the Upper Cretaceous Tremp Formation in the southern Pyrenees, Catalonia provides new information for addressing these issues. Nine horizons containing Megaloolithus siruguei clutches are exposed near the village of Coll de Nargó. Tectonic deformation in the study area strongly influenced egg size and shape, which could potentially lead to misinterpretation of reproductive biology if 2D and 3D maps are not corrected for bed dip that results from tectonism.<h4>Methodology/findings</h4>Detailed taphonomic study and three-dimensional modelling of fossil eggs show that intact M. siruguei clutches contained 20-28 eggs, which is substantially larger than commonly reported from Europe and India. Linear and grouped eggs occur in three superimposed levels and form an asymmetric, elongate, bowl-shaped profile in lateral view. Computed tomography data support previous interpretations that the eggs hatched within the substrate. Megaloolithid clutch sizes reported from other European and Indian localities are typically less than 15 eggs; however, these clutches often include linear or grouped eggs that resemble those of the larger Pinyes clutches and may reflect preservation of incomplete clutches.<h4>Conclusions/significance</h4>We propose that 25 eggs represent a typical megaloolithid clutch size and smaller egg clusters that display linear or grouped egg arrangements reported at Pinyes and other localities may represent eroded remnants of larger clutches. The similarity of megaloolithid clutch morphology from localities worldwide strongly suggests common reproductive behaviour. The distinct clutch geometry at Pinyes and other localities likely resulted from the asymmetrical, inclined, and laterally compressed titanosaur pes unguals of the female, using the hind foot for scratch-digging during nest excavation.Bernat VilaFrankie D JacksonJosep FortunyAlbert G SellésAngel GalobartPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 5, Iss 5, p e10362 (2010)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Bernat Vila Frankie D Jackson Josep Fortuny Albert G Sellés Angel Galobart 3-D modelling of megaloolithid clutches: insights about nest construction and dinosaur behaviour.
description	<h4>Background</h4>Megaloolithid eggs have long been associated with sauropod dinosaurs. Despite their extensive and worldwide fossil record, interpretations of egg size and shape, clutch morphology, and incubation strategy vary. The Pinyes locality in the Upper Cretaceous Tremp Formation in the southern Pyrenees, Catalonia provides new information for addressing these issues. Nine horizons containing Megaloolithus siruguei clutches are exposed near the village of Coll de Nargó. Tectonic deformation in the study area strongly influenced egg size and shape, which could potentially lead to misinterpretation of reproductive biology if 2D and 3D maps are not corrected for bed dip that results from tectonism.<h4>Methodology/findings</h4>Detailed taphonomic study and three-dimensional modelling of fossil eggs show that intact M. siruguei clutches contained 20-28 eggs, which is substantially larger than commonly reported from Europe and India. Linear and grouped eggs occur in three superimposed levels and form an asymmetric, elongate, bowl-shaped profile in lateral view. Computed tomography data support previous interpretations that the eggs hatched within the substrate. Megaloolithid clutch sizes reported from other European and Indian localities are typically less than 15 eggs; however, these clutches often include linear or grouped eggs that resemble those of the larger Pinyes clutches and may reflect preservation of incomplete clutches.<h4>Conclusions/significance</h4>We propose that 25 eggs represent a typical megaloolithid clutch size and smaller egg clusters that display linear or grouped egg arrangements reported at Pinyes and other localities may represent eroded remnants of larger clutches. The similarity of megaloolithid clutch morphology from localities worldwide strongly suggests common reproductive behaviour. The distinct clutch geometry at Pinyes and other localities likely resulted from the asymmetrical, inclined, and laterally compressed titanosaur pes unguals of the female, using the hind foot for scratch-digging during nest excavation.
format	article
author	Bernat Vila Frankie D Jackson Josep Fortuny Albert G Sellés Angel Galobart
author_facet	Bernat Vila Frankie D Jackson Josep Fortuny Albert G Sellés Angel Galobart
author_sort	Bernat Vila
title	3-D modelling of megaloolithid clutches: insights about nest construction and dinosaur behaviour.
title_short	3-D modelling of megaloolithid clutches: insights about nest construction and dinosaur behaviour.
title_full	3-D modelling of megaloolithid clutches: insights about nest construction and dinosaur behaviour.
title_fullStr	3-D modelling of megaloolithid clutches: insights about nest construction and dinosaur behaviour.
title_full_unstemmed	3-D modelling of megaloolithid clutches: insights about nest construction and dinosaur behaviour.
title_sort	3-d modelling of megaloolithid clutches: insights about nest construction and dinosaur behaviour.
publisher	Public Library of Science (PLoS)
publishDate	2010
url	https://doaj.org/article/bb4a01ca75124006a15712ea3889fae9
work_keys_str_mv	AT bernatvila 3dmodellingofmegaloolithidclutchesinsightsaboutnestconstructionanddinosaurbehaviour AT frankiedjackson 3dmodellingofmegaloolithidclutchesinsightsaboutnestconstructionanddinosaurbehaviour AT josepfortuny 3dmodellingofmegaloolithidclutchesinsightsaboutnestconstructionanddinosaurbehaviour AT albertgselles 3dmodellingofmegaloolithidclutchesinsightsaboutnestconstructionanddinosaurbehaviour AT angelgalobart 3dmodellingofmegaloolithidclutchesinsightsaboutnestconstructionanddinosaurbehaviour
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3-D modelling of megaloolithid clutches: insights about nest construction and dinosaur behaviour.

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