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Shell microstructures of the helcionelloid mollusc Anabarella australis from the lower Cambrian (Series 2) Xinji Formation of North China
Li, Luoyang1,2; Zhang, Xingliang1; Skovsted, Christian B.1,2; Yun, Hao1; Li, Guoxiang3; Pan, Bing2,3
2019-10-18
发表期刊JOURNAL OF SYSTEMATIC PALAEONTOLOGY
ISSN1477-2019
卷号17期号:20页码:1699-1709
摘要

Although various types of shell microstructures are documented from Cambrian molluscs, the precise organization and mineralogical composition of Terreneuvian molluscs are relatively unknown. Anabarella was one of the first helcionellid molluscs to appear in the Terreneuvian, with the genus surviving until the third epoch of the Cambrian. Here, shell microstructures of Anabarella australis have been studied based on new collections from the lower Cambrian (Series 2) Xinji Formation of the North China Block. Results show that A. australis has a laminar inner shell layer that consists of crossed foliated lamellar microstructure (CFL). Nacreous, crossed-lamellar and foliated aragonite microstructures previously documented in the older (Terreneuvian) species A. plana are here revised as preservational artefacts of the CFL layers. This complex skeletal organization of Anabarella suggests that mechanisms of molluscan biomineralization evolved very rapidly. Morphologically, specimens from the Chaijiawa section show a pattern of distinct 'pseudo-dimorphism' as external coatings are identical to Anabarella, while associated internal moulds are similar to the helcionelloid genus Planutenia. In contrast, internal moulds from the Shangzhangwan section show considerable morphological variation owing to preservational bias and show greater similarities to specimens from South Australia, Northeast Greenland and Germany. These observations demonstrate that the extensive morphological variation seen in the internal moulds of the cosmopolitan genus Anabarella are primarily preservational artefacts and are unlikely to represent the real intra- and interspecific variability of the animal. In these cases, Planutenia is here confirmed to be a subjective synonym of Anabarella.

关键词Cambrian Helcionelloida shell microstructure taxonomy
DOI10.1080/14772019.2018.1546236
语种英语
关键词[WOS]FOSSILS ; MORPHOLOGY ; ORIGIN ; BRACHIOPODS ; BIVALVIA
资助项目China Scholarship Council (CSC)[201706970037] ; National Key Research and Development Program[2017YFC0603101] ; Natural Science Foundation of China[41621003] ; Natural Science Foundation of China[41890845] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB26000000] ; 111 Project[D17013] ; Swedish Research Council[VR2016-04610]
WOS研究方向Evolutionary Biology ; Paleontology
WOS类目Evolutionary Biology ; Paleontology
WOS记录号WOS:000486521700001
项目资助者China Scholarship Council (CSC) ; National Key Research and Development Program ; Natural Science Foundation of China ; Strategic Priority Research Program of Chinese Academy of Sciences ; 111 Project ; Swedish Research Council
出版者TAYLOR & FRANCIS LTD
文献类型期刊论文
条目标识符http://ir.nigpas.ac.cn/handle/332004/27880
专题中国科学院南京地质古生物研究所
通讯作者Zhang, Xingliang; Skovsted, Christian B.
作者单位1.Northwest Univ, Dept Geol, Shaanxi Key Lab Early Life & Environm, State Key Lab Continental Dynam, Xian 710069, Shaanxi, Peoples R China
2.Swedish Museum Nat Hist, Dept Palaeobiol, Box 50007, SE-10405 Stockholm, Sweden
3.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Jiangsu, Peoples R China
推荐引用方式
GB/T 7714
Li, Luoyang,Zhang, Xingliang,Skovsted, Christian B.,et al. Shell microstructures of the helcionelloid mollusc Anabarella australis from the lower Cambrian (Series 2) Xinji Formation of North China[J]. JOURNAL OF SYSTEMATIC PALAEONTOLOGY,2019,17(20):1699-1709.
APA Li, Luoyang,Zhang, Xingliang,Skovsted, Christian B.,Yun, Hao,Li, Guoxiang,&Pan, Bing.(2019).Shell microstructures of the helcionelloid mollusc Anabarella australis from the lower Cambrian (Series 2) Xinji Formation of North China.JOURNAL OF SYSTEMATIC PALAEONTOLOGY,17(20),1699-1709.
MLA Li, Luoyang,et al."Shell microstructures of the helcionelloid mollusc Anabarella australis from the lower Cambrian (Series 2) Xinji Formation of North China".JOURNAL OF SYSTEMATIC PALAEONTOLOGY 17.20(2019):1699-1709.
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