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首页> 外文期刊>Alcheringa: An Australasian Journal of Palaeontology >The first fossil avian egg from Brazil
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The first fossil avian egg from Brazil

机译：来自巴西的第一个化石禽蛋

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摘要

In contrast to the rich record of eggs from non-avian dinosaurs, complete eggs attributable to Mesozoic birds are relatively scarce. Nevertheless, several well-preserved specimens have been discovered over the last three decades revealing functional and phylogenetic characters that shed light on the breeding strategies of extinct birds. Here we report the first fossil avian egg from Brazil, which was discovered in Upper Cretaceous strata of S?o Paulo in the southeastern part of the country. The taxonomic identity and structural features of the biomineralized tissues were determined using a combination of Scanning Electron Microscopy, Wave Dispersion Energy analyses and Computed Tomography. These show that the 125.5-μm-thick shell of the 31.4 × 19.5mm egg incorporates three structural layers of similar thickness with both prismatic and aprismatic boundaries. Close similarity between the Brazilian bird egg and those of enantiornithines from the Upper Cretaceous Bajo de la Carpa Formation (Río Colorado Subgroup) of Argentina advocates affinity with basal Ornithothoraces. Furthermore, coherency of their depositional contexts might imply a compatible preference for breeding and nesting environments.
机译：与非禽类恐龙卵的丰富记录相比，中生代鸟类的完整卵相对较少。然而，在过去的三十年中，发现了几个保存完好的标本，这些标本具有功能和系统发育特征，为灭绝鸟类的繁殖策略提供了启示。在这里，我们报告了巴西的第一个化石禽蛋，它是在该国东南部圣保罗的上白垩统地层发现的。生物矿化组织的分类学特征和结构特征是使用扫描电子显微镜，波分散能分析和计算机断层扫描技术的组合来确定的。这些结果表明，31.4×19.5mm蛋的125.5μm厚的壳包含具有类似厚度的三个结构层，具有棱柱形和棱形边界。巴西鸟卵与阿根廷上白垩统巴霍－德拉卡尔帕组（里约科罗拉多亚组）的对映鸟氨酸之间的相似性提倡与基础鸟喙藻亲和。此外，它们沉积环境的连贯性可能意味着对繁殖和筑巢环境的兼容性偏爱。

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