CROCODYLOMORPH EGGS and EGGSHELLS FROM THE ADAMANTINA FORMATION (BAURU GROUP), UPPER CRETACEOUS of BRAZIL

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dc.contributor.authorOliveira, Carlos E. M. [UNESP]
dc.contributor.authorSantucci, Rodrigo M.
dc.contributor.authorAndrade, Marco B.
dc.contributor.authorFulfaro, Vicente J. [UNESP]
dc.contributor.authorBasilio, Jose A. F.
dc.contributor.authorBenton, Michael J.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionFundacio Educ Fernandopolis
dc.contributor.institutionUniv Camilo Castelo Branco
dc.contributor.institutionUniversidade de Brasília (UnB)
dc.contributor.institutionDept Nacl Prod Mineral
dc.contributor.institutionUniv Bristol
dc.contributor.institutionUniversidade Federal do Rio Grande do Sul (UFRGS)
dc.date.accessioned2014-05-20T15:31:34Z
dc.date.available2014-05-20T15:31:34Z
dc.date.issued2011-03-01
dc.description.abstractCompared with crocodylomorph body fossils, the record of fossil crocodiloid eggs is scarce and poorly understood, a gap partially attributed to their typically thin eggshell, which is not conducive to preservation. A remarkable new association of well-preserved eggs and eggshells from the Adamantina Formation (Bauru Group, Upper Cretaceous) is described and compared to other known materials, while the significance of their unique oological features is discussed. These eggs constitute a new ootaxon, Bauruoolithus fragilis oogen. et oosp. nov., diagnosed by the following characteristics: elongate and elliptical egg with blunt ends; length-to-diameter ratio of 1:0.55; outer surface slightly undulating; shell thickness ranging from 0.15 to 0.25 mm; pore openings elliptical or teardrop-shaped, ranging from 30 to 80 mu m in diameter; and shell units wider than higher, with the interstices forming an obtuse triangle. Specimens of Bauruoolithus also show only slight signs of extrinsic degradation that, coupled with the evidence that some of them constitute hatched eggs, suggests that the egg-laying taxon had a different pattern of egg incubation, in which the hatchling could break through the rather thin eggshell relatively easily and that the extrinsic degradation of the eggshell was not necessary. This contrasts with the pattern of incubation for all other known crocodylomorphs and crocodiloid eggs, where extrinsic degradation is a key component of the hatching process.en
dc.description.affiliationUniv Estadual Paulista, IGCE, Dept Geol Aplicada, Inst Geociencias & Ciencias Exatas, BR-13506900 São Paulo, Brazil
dc.description.affiliationFundacio Educ Fernandopolis, FEF, BR-15600000 São Paulo, Brazil
dc.description.affiliationUniv Camilo Castelo Branco, Unicastelo, BR-15600000 São Paulo, Brazil
dc.description.affiliationUniversidade de Brasilia (UnB), Fac UnB Planaltina, BR-73300000 Brasilia, DF, Brazil
dc.description.affiliationDept Nacl Prod Mineral, BR-70041903 Brasilia, DF, Brazil
dc.description.affiliationUniv Bristol, Palaeobiol & Biodivers Res Grp, Dept Earth Sci, Bristol BS8 1RJ, Avon, England
dc.description.affiliationUniversidade Federal do Rio Grande do Sul (UFRGS), Dept Paleontol & Estratig, BR-91501970 Porto Alegre, RS, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, IGCE, Dept Geol Aplicada, Inst Geociencias & Ciencias Exatas, BR-13506900 São Paulo, Brazil
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipBob Savage Memorial Fund (BRSU-G/England)
dc.description.sponsorshipIdCNPq: 200381/2006-7
dc.format.extent309-321
dc.identifierhttp://dx.doi.org/10.1111/j.1475-4983.2010.01028.x
dc.identifier.citationPalaeontology. Malden: Wiley-blackwell, v. 54, p. 309-321, 2011.
dc.identifier.doi10.1111/j.1475-4983.2010.01028.x
dc.identifier.issn0031-0239
dc.identifier.urihttp://hdl.handle.net/11449/40668
dc.identifier.wosWOS:000288448800006
dc.language.isoeng
dc.publisherWiley-Blackwell
dc.relation.ispartofPalaeontology
dc.relation.ispartofjcr3.730
dc.relation.ispartofsjr1,840
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjecteggsen
dc.subjectcrocodylomorphsen
dc.subjectUpper Cretaceousen
dc.subjectBauru Basinen
dc.subjectAdamantina Formationen
dc.subjectextrinsic degradationen
dc.subjectBaurusuchusen
dc.titleCROCODYLOMORPH EGGS and EGGSHELLS FROM THE ADAMANTINA FORMATION (BAURU GROUP), UPPER CRETACEOUS of BRAZILen
dc.typeArtigo
dcterms.licensehttp://olabout.wiley.com/WileyCDA/Section/id-406071.html
dcterms.rightsHolderWiley-blackwell
unesp.author.orcid0000-0002-3452-801X[3]
unesp.author.orcid0000-0002-4323-1824[6]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Geociências e Ciências Exatas, Rio Claropt

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Artigos - Geologia Aplicada - IGCE