- 期刊
Shell Microstructure and Its Inheritance in the Calcitic Helcionellid ＂Mackinnonia＂
並列摘要
＂Mackinnonia davidi＂ from the Cambrian (Series 2) of Australia has a prismatic outer shell layer and, as newly described here, a calcitic semi-nacre inner layer. The pattern is the same as in stenothecids such as ＂Mellopegma＂, providing more evidence for a strong phylogenetic signal in the shell microstructure of Cambrian molluscs. In addition, calcite now appears to have been common in helcionellids and other molluscs during the early and middle Cambrian, with many species exhibiting foliated calcite. This is surprising given the dominance of aragonite in molluscs, both modern and from post-Cambrian fossil deposits with exceptional shell microstructure preservation, including localities from the Ordovician of the Cincinnati region, USA.
並列關鍵字
Cambrian ； helcionellid ； Mollusca ； Mackinnonia ； Australia ； shell microstructure ； biomineralization延伸閱讀
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