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.

中文翻译：

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西班牙东北部阿普第晚期完整的有柄海百合为特提斯中生代海洋革命提供了见解


在过去的地质时期，有柄的海百合在浅海栖息地很常见，但现在仅限于深海。其测深分布变化的时间已经在中生代海洋革命（MMR）的背景下进行了讨论，这是显生宙海洋生态系统变化最重要的事件之一，通常被认为是在中生代晚期的某个时候开始的。三叠纪。然而，白垩纪有柄海百合的记录很差，主要由脱节的小骨组成，其来源往往难以确定，这妨碍了对它们生活的栖息地的解释。在这里，我们报告了来自阿普第安保存完好的异百里鱼，并使用涉及沉积学、同位素和古生物学数据的多学科方法来证明它们居住在受盐度变化影响的浅泻湖中。这表明它们今天在这种环境中的消失并不是物理化学因素的作用，并强化了这样的观点：捕食压力可能在它们的水深分布中发挥了关键作用。捕食的影响得到了早白垩世第一个再生臂记录的支持。