Data from: The effect of taxonomic corrections on Phanerozoic generic richness trends in marine bivalves with a discussion on the clade’s overall history

This study uses a comprehensive, revised, and updated global bivalve dataset combining information from two major databases available to study temporal trends in Phanerozoic bivalve richness: the Sepkoski Compendium and the Paleobiology Database. This compilation results in greater taxonomic and stratigraphic coverage than possible with either of the two databases alone. However, there are challenges in directly comparing these two sources due to differences in their taxonomic designations and stratigraphic range information. Moreover, both of these datasets are fraught with a number of taxonomic errors, which can significantly bias the overall richness estimate. Additionally, a substantial number of taxonomic corrections were made before a new Phanerozoic bivalve richness curve was produced. The new generic taxonomic curve is comparable with the trajectory of the Sepkoski’s modern fauna and shows rapid and substantial diversification through the Ordovician, followed by a Paleozoic plateau, a Mesozoic high, and Cenozoic diversification after a small reduction in richness associated with the K/Pg extinction. The steep Cenozoic rise documented in the raw richness curve derived from the new dataset is likely real, and reflects the overall robustness and completeness of the bivalve fossil record.

本研究采用一套经全面修订与更新的全球双壳类（bivalve）数据集，整合了现有两大主流数据库的信息，以探究显生宙（Phanerozoic）双壳类丰富度的时间演化趋势。这两大数据库分别为赛普科斯基汇编（Sepkoski Compendium）与古生物学数据库（Paleobiology Database）。相较于单独使用任一数据库，本次数据整合极大拓展了分类学与地层学覆盖范围。不过，由于二者在分类命名与地层延限信息上存在差异，直接对比这两类数据源存在一定挑战。此外，两套数据集均存在诸多分类学误差，可能会显著偏倚整体丰富度的估算结果。在构建全新的显生宙双壳类丰富度曲线前，研究团队已完成大量分类学校正工作。新的属级分类学多样性曲线与赛普科斯基提出的现代生物群演化轨迹具有可比性：其显示奥陶纪时期发生快速且显著的辐射演化，随后进入古生代多样性平台期、中生代繁盛期，并在经历与K/Pg灭绝（K/Pg extinction）事件相关的小幅多样性降低后，于新生代再度迎来辐射演化。基于新数据集得到的原始丰富度曲线所呈现的新生代急剧上升趋势，大概率属实，这反映了双壳类化石记录的整体稳健性与完整性。