Apatite in Hamipterus tianshanensis eggshell: advances in understanding the structure of pterosaur eggs by Raman spectroscopy

doi:10.1186/s40494-022-00720-7

IVPP-IR > 中科院古脊椎所（2000年以后）

	Apatite in Hamipterus tianshanensis eggshell: advances in understanding the structure of pterosaur eggs by Raman spectroscopy
	Li, Ying 1,2; Zhu, Xufeng 2,3,4; Wang, Qiang2,4 ; Jiang, Shunxing 2,4; Yang, Yimin 1,2; Luo, Wugan 1,2; Wang, Xiaolin2,3,4
	2022-06-14
发表期刊	HERITAGE SCIENCE
ISSN	2050-7445
卷号	10 期号:1 页码:14
摘要	Pterosaur eggs can offer information about pterosaur reproductive strategies and are extremely precious because only a small number of specimens have been discovered. Previous studies have mainly focused on morphological descriptions of pterosaur eggs and their embryos while the chemical composition of pterosaur eggs has received little attention. The conventional view believed that the eggshell was composed of calcite. However, previous SEM-EDS results for Hamipterus tianshanensis showed that the eggshell contains phosphorus. Therefore, the object of this research is to determine the mineral composition of the eggshell of H. tianshanensis. Two eggs were analyzed by scanning electron microscopy coupled with energy dispersive X-ray spectrometry (SEM-EDS) and Raman spectroscopy. The SEM-EDS results show that both surface and cross section are porous and characterized by small irregularly shaped particulates. Moreover, the distribution of Ca and P has a strict coincidence in the cross-section of eggshells. Furthermore, neither the intense peaks of calcite nor organic peaks can be observed by Raman spectroscopy in eggshells. Meanwhile, the Raman spectroscopy mapping analysis result shows a sharp and intense peak at approximately 966 cm(-1) among the white eggshell, which can be hard evidence that H. tianshanensis eggs are mainly composed of calcium phosphate. Combined with the present of F in the eggshell, it can be inferred that fluorapatite Ca-5(PO4)(3)F is the main mineral. The fluorapatite eggshell can be interpreted in two ways. One explanation is that H. tianshanensis laid apatite-shelled eggs, similar to living Salvator merianae, and the bioapatite transformed to fluorapatite over geological time. Another possible explanation is that the fluorapatite comes from the result of phosphatization of soft egg membrane tissues through taphonomic processes, indicating that H. tianshanensis might have laid soft eggs. Regardless, the results show that fluorapatite, rather than calcite is the main preserved mineral composition of H. tianshanensis eggshell, correcting the previous view. This study contributes to the present understanding of the mineral composition of pterosaur eggshells and may offer some insight into the pterosaur reproduction pattern.
关键词	Early Cretaceous Pterosaur eggs Soft eggshell SEM-EDS Biomineralization Phosphatization
DOI	10.1186/s40494-022-00720-7
关键词[WOS]	DIAGENETIC ALTERATION ; LIFE-HISTORY ; FOSSIL ; INSIGHT ; PALEONTOLOGY ; PIGMENTS ; EMBRYO ; ORIGIN ; BASIN ; BONE
收录类别	SCI
语种	英语
资助项目	National Social Science Fund of China[20VJXG018] ; National Social Science Fund of China[20VJXG018] ; Beijing Municipal Social Science Foundation[21DTR046] ; Beijing Municipal Social Science Foundation[21DTR046] ; National Natural Science Foundation[42288201] ; National Natural Science Foundation[42288201] ; National Natural Science Foundation[41572020] ; National Natural Science Foundation[41572020] ; Fundamental Research Funds for the Central Universities[E1E40905X2] ; Fundamental Research Funds for the Central Universities[E1E40905X2] ; Hami City Government Cooperation Project ; Hami City Government Cooperation Project
WOS研究方向	Arts & Humanities - Other Topics ; Chemistry ; Materials Science ; Spectroscopy
WOS类目	Humanities, Multidisciplinary ; Chemistry, Analytical ; Materials Science, Multidisciplinary ; Spectroscopy
WOS记录号	WOS:000810663000001
出版者	SPRINGER
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/21672
专题	中科院古脊椎所（2000年以后）
通讯作者	Luo, Wugan; Wang, Xiaolin
作者单位	1.Univ Chinese Acad Sci, Dept Archaeol & Anthropol, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Key Lab Vertebrate Evolut & Human Origins, Beijing 100044, Peoples R China 3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China 4.CAS Ctr Excellence Life & Paleoenvironm, Beijing 100044, Peoples R China
推荐引用方式 GB/T 7714	Li, Ying,Zhu, Xufeng,Wang, Qiang,et al. Apatite in Hamipterus tianshanensis eggshell: advances in understanding the structure of pterosaur eggs by Raman spectroscopy[J]. HERITAGE SCIENCE,2022,10(1):14.
APA	Li, Ying.,Zhu, Xufeng.,Wang, Qiang.,Jiang, Shunxing.,Yang, Yimin.,...&Wang, Xiaolin.(2022).Apatite in Hamipterus tianshanensis eggshell: advances in understanding the structure of pterosaur eggs by Raman spectroscopy.HERITAGE SCIENCE,10(1),14.
MLA	Li, Ying,et al."Apatite in Hamipterus tianshanensis eggshell: advances in understanding the structure of pterosaur eggs by Raman spectroscopy".HERITAGE SCIENCE 10.1(2022):14.

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