Here we describe a new upper Toarcian (Lower Jurassic) marine gastropod fauna from rocks of the Cleveland Basin exposed on the North Yorkshire coast of England. The fossil assemblage consists of 16 species, of which three are new: Katosira? bicarinata sp. nov., Turritelloidea stepheni sp. nov. and Striactaenonina elegans sp. nov. Four species are described in open nomenclature as Tricarilda? sp., Jurilda sp., Cylindrobullina sp. and Cossmannina sp. The other species have previously been described: Coelodiscus minutus (Schübler in Zieten), Procerithium quadrilineatum (Römer), Pseudokatosira undulata (Benz in von Zieten), Palaeorissoina aff. acuminata (Gründel), Pietteia unicarinata (Hudleston), Globularia cf. canina (Hudleston), Striactaeonina cf. richterorum Schulbert & Nützel, Striactaenonina aff. tenuistriata (Hudleston) and Sulcoactaeon sedgvici (Phillips). Most of these species are the earliest records of their respective genera and show palaeobiogeographical connections with contemporary gastropod associations from other regions of Europe and South America. The taxonomic composition of the upper Toarcian Cleveland Basin gastropod assemblage differs substantially from the faunas of the upper Pliensbachian and lower Toarcian Tenuicostatum Zone, showing the strong effect of the early Toarcian mass extinction event on the marine gastropod communities in the basin. Only a few gastropod species are shared between the late Toarcian faunas and the much more diverse Aalenian gastropod faunas in the Cleveland Basin, suggesting that there was a facies control on gastropod occurrences at that time. This is also a potential explanation for the taxonomic differences between the late Toarcian gastropod faunas in the Cleveland Basin and those in France, and northern and southern Germany.

中文翻译：

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来自英格兰克利夫兰盆地的上Toarcian（下侏罗统）海洋腹足动物：系统学，古生物地理学和早期Toarcian灭绝事件对生物恢复的贡献

在这里，我们从暴露于英格兰北约克郡海岸的克利夫兰盆地岩石中描述了一种新的上Toarcian（下侏罗纪）海洋腹足动物群。该化石组合包括16个品种，其中三个是新的：Katosira？bicarinata SP。十一月，Turritelloidea stepheni sp.。十一月 和Striactaenonina elegans sp.。十一月 公开命名中有四个物种称为Tricarilda？，Jurilda sp。，Cylindrobullina sp。和Cossmannina sp。其它物种之前已描述：穴盘木属蝽（Schübler在Zieten），Procerithium quadrilineatum（罗梅尔），Pseudokatosira undulata（奔驰在冯Zieten），Palaeorissoina AFF。喜树（Gründel），Pietteia unicarinata（Hudleston），Globularia比照 canina（Hudleston），Striactaeonina cf. Richterorum Schulbert和Nützel，Striactaenonina公司。tenuistriata（Hudleston）和Sulcoactaeon sedgvici（菲利普斯）。这些物种大多数是其各自属的最早记录，显示与来自欧洲和南美其他地区的当代腹足动物协会的古生物地理联系。上Toarcian克利夫兰盆地腹足纲组合的分类组成与上Pliensbachian和下Toarcian Tenuicostatum的动物区系有很大差异。区域，显示了早期Toarcian物种大灭绝事件对盆地中海洋腹足动物群落的强烈影响。克利夫兰盆地的晚期Toarcian动物群和更多样化的Aalenian腹足动物群之间只有少数腹足动物种类，这表明当时对腹足动物的发生有一定的控制作用。这也是克利夫兰盆地和法国以及德国北部和南部晚期Toarcian腹足动物区系的分类学差异的潜在解释。