西班牙东北部始新纪晚期出土的完好无损的有柄棘皮动物为了解特提斯中生代海洋革命提供了线索

Geology Pub Date : 2024-05-10 DOI:10.1130/g52179.1
Á. García-Penas, T. Baumiller, Marcos Aurell, Samuel Zamora
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引用次数: 0

摘要

有柄脊索动物在过去的地质时期常见于浅海生境,但如今却局限于深海。中生代海洋革命(MMR)是新生代海洋生态系统最重要的变迁之一,一般认为始于晚三叠世的某个时期。然而,白垩纪有柄脊索动物的记录并不丰富,主要是一些难以确定来源的骨片,这妨碍了对其生活环境的解释。在这里,我们报告了来自始新世的保存完好的异脊类动物,并利用涉及沉积学、同位素和古生物学数据的多学科方法,证明它们生活在盐度变化的浅潟湖中。这表明,它们今天在这种环境中的缺失并不是物理化学因素造成的,同时也强化了捕食压力可能在它们的水深分布中起到了关键作用的观点。第一份早白垩世的再生臂记录支持了捕食的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Intact stalked crinoids from the late Aptian of NE Spain offer insights into the Mesozoic Marine Revolution in the Tethys
Stalked crinoids were common in shallow-marine habitats in the geologic past but are today restricted to the deep sea. The timing of the shift in their bathymetric distribution has been discussed in the context of the Mesozoic Marine Revolution (MMR), one of the most important episodes of change in marine ecosystems of the Phanerozoic, which is generally thought to have begun sometime in the Late Triassic. However, the record of Cretaceous stalked crinoids is poor, consisting primarily of disarticulated ossicles for which the provenance is often difficult to determine, hampering interpretations of the habitat in which they lived. Here, we report on well-preserved isocrinids from the Aptian and use a multidisciplinary approach involving sedimentological, isotopic, and paleontological data to demonstrate that they inhabited a shallow lagoon subject to salinity variations. This suggests that their absence from such environments today is not a function of physicochemical factors and reinforces the idea that predation pressure may have played a critical role in their bathymetric distribution. The influence of predation is supported by the first Early Cretaceous record of a regenerating arm.
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