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标题：The impact of the Pliensbachian–Toarcian crisis on belemnite assemblages and size distribution
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作者：Kenneth De Baets ; Paulina S. Nätscher ; Patricia Rita 等
期刊名称：Swiss Journal of Palaeontology
印刷版ISSN：1664-2376
电子版ISSN：1664-2384
出版年度：2021
卷号：140
期号：1
页码：1-14
DOI：10.1186/s13358-021-00242-y
语种：English
出版社：SpringerOpen
摘要：Abstract The second-order Pliensbachian–Toarcian crisis affected major groups of marine organisms. While its impact has been intensively studied for ammonites, the response of belemnites is only currently emerging through quantitative studies. Novel overall and regional diversity analyses suggest that belemnite richness in the NW-Tethys drops at the Pliensbachian–Toarcian boundary, while overall diversity slightly increases in NW-Tethys assemblages during the Toarcian Oceanic Anoxic event (T-OAE), mostly driven by NW European assemblages (e.g., Yorkshire). The T-OAE coincides with marked taxonomic turnover within individual basins, which is associated with an increase in median rostrum size of specimens in taxa at most localities. The changes in median body size across the Pliensbachian–Toarcian boundary are less consistent and driven by changes in body size within individual lineages crossing the boundary. However, our analyses also illustrate differences in sampling across the Pliensbachian–Toarcian crisis, which needs to be considered in further studies.