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dc.contributor.author
Norell, Mark A.
dc.contributor.author
Weimann, Jasmina
dc.contributor.author
Fabbri, Matteo
dc.contributor.author
Yu, Congyu
dc.contributor.author
Marsicano, Claudia Alicia
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dc.contributor.author
Moore Nall, Anita
dc.contributor.author
Varricchio, David J.
dc.contributor.author
Pol, Diego
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dc.contributor.author
Zelenitsky, Darla K.
dc.date.available
2020-07-16T20:37:04Z
dc.date.issued
2020-05
dc.identifier.citation
Norell, Mark A.; Weimann, Jasmina; Fabbri, Matteo; Yu, Congyu; Marsicano, Claudia Alicia; et al.; The first dinosaur egg was soft; Nature Publishing Group; Nature; 583; 5-2020; 406-410
dc.identifier.issn
0028-0836
dc.identifier.uri
http://hdl.handle.net/11336/109490
dc.description.abstract
Calcified eggshell protect developing embryos against environmental stress and contributes toreproductive success. Since modern crocodilians and birds lay hard-shelled eggs, this eggshelltype has also been inferred for nonavian dinosaurs. Known dinosaur eggshell is characterized byan innermost membrane, an overlying protein matrix containing calcite, and an outermost waxycuticle. The calcitic eggshell consists of one or more ultrastructural layers that, along withrespiratory pore configurations, differs drastically across the three major dinosaur clades. Whileonly hadrosaurid, derived sauropod, and tetanuran eggshells have been discovered to date,missing fossil eggshells covering the phylogenetic gaps between these taxa challenge efforts tohomologize eggshell across all dinosaurs. We present mineralogical, organochemical, andultrastructural evidence for an originally non-biomineralized, soft-shelled nature of exceptionallypreserved ornithischian Protoceratops and basal sauropodomorph Mussaurus eggs. Statisticalevaluation of in situ organic phase Raman spectra obtained for a representative set of hard- andsoft-shelled, fossil and extant diapsid eggshells, clusters the originally organic, but secondarilyphosphatized Protoceratops and the carbonaceous Mussaurus eggshells with soft eggshells.Histology corroborates the organic composition of these two soft-shelled dinosaur eggs,revealing a stratified arrangement resembling soft turtle eggshell. An ancestral statereconstruction of composition and ultrastructure compared eggshells from Protoceratops andMussaurus to those from other archosaurs, and revealed that the first dinosaur egg was softshelled.The calcified dinosaur egg evolved at least three times independently throughout theMesozoic, explaining the bias towards eggshells of highly derived dinosaurs in the fossil record.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Nature Publishing Group
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dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Eggshell
dc.subject
Evolution
dc.subject
Dinosauria
dc.subject
Structure
dc.subject.classification
Paleontología
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dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
The first dinosaur egg was soft
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2020-07-01T16:59:11Z
dc.journal.volume
583
dc.journal.pagination
406-410
dc.journal.pais
Reino Unido
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dc.journal.ciudad
Londres
dc.description.fil
Fil: Norell, Mark A.. American Museum of Natural History; Estados Unidos
dc.description.fil
Fil: Weimann, Jasmina. University of Yale; Estados Unidos
dc.description.fil
Fil: Fabbri, Matteo. University of Yale; Estados Unidos
dc.description.fil
Fil: Yu, Congyu. American Museum of Natural History; Estados Unidos
dc.description.fil
Fil: Marsicano, Claudia Alicia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
dc.description.fil
Fil: Moore Nall, Anita. State University of Montana; Estados Unidos
dc.description.fil
Fil: Varricchio, David J.. State University of Montana; Estados Unidos
dc.description.fil
Fil: Pol, Diego. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Museo Paleontológico Egidio Feruglio; Argentina
dc.description.fil
Fil: Zelenitsky, Darla K.. University of Calgary; Canadá
dc.journal.title
Nature
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.1038/s41586-020-2412-8
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.nature.com/articles/s41586-020-2412-8
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