Abundance of chondrichthyan genera through time

As of September 2019, the Florida Museum of Natural History (FLMNH) had a curated collection of 117,449 chondrichthyan specimens from Florida, spanning the Eocene through the Pleistocene. Herein, I evaluated the completeness of the chondrichthyan fossil record from Florida based on the FLMNH collection, while analyzing trends in taxonomic and ecomorphological diversity. At least 70 chondrichthyan taxa were recognized in the FLMNH collection, representing 10 orders, 26 families, and 42 genera; of which, 20 taxa represent first occurrences from Florida. A sample of 107,698 specimens was organized into 12 time bins to analyze taxonomic and ecomorphological diversity, with an expectation that diversity trends would correspond with global climate events (e.g., the Eocene-Oligocene Transition and the Middle Miocene Climatic Optimum). However, diversity trends were obscured by pervasive sampling bias, attributable to variable collection methods, research prioritizations, and regional lithologi...截至2019年9月，佛罗里达自然历史博物馆（Florida Museum of Natural History, FLMNH）馆藏经整理的软骨鱼类（chondrichthyan）标本共计117449件，分布于佛罗里达境内，年代覆盖始新世至更新世。本研究基于该馆馆藏，评估了佛罗里达地区软骨鱼类化石记录的完整性，并分析了其分类学与生态形态多样性的变化趋势。该馆藏中共确认至少70个软骨鱼类分类单元，隶属于10个目、26个科及42个属；其中20个分类单元为佛罗里达地区的首次记录。研究选取107698件标本划分为12个时间间隔，以分析分类学与生态形态多样性的变化，并预期多样性趋势可与全球气候事件（如始新世-渐新世转型事件、中新世中期气候最适宜期）相契合。然而，由于采集方法、研究优先级及区域岩性等因素导致的普遍采样偏差，多样性趋势被掩盖。