Upper Toarcian (Lower Jurassic) marine gastropods from the Cleveland Basin, England: systematics, palaeobiogeography and contribution to biotic recovery from the early Toarcian extinction event

Here we describe a new late Toarcian (Lower Jurassic) marine gastropod fauna from rocks of the Cleveland Basin exposed on the North Yorkshire coast of England. The fossil assemblage comprises sixteen 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, 1999b), 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 connection...

本文记述了产自英格兰北约克郡海岸裸露的克利夫兰盆地岩层中的一套全新早侏罗世托阿尔阶（Toarcian）晚期海生腹足类动物群。该化石组合共计16个物种，其中3个为新种：双脊卡托螺？（Katosira? bicarinata sp. nov.）、斯蒂芬塔螺超科新种（Turritelloidea stepheni sp. nov.）以及雅致纹卷管螺？（Striactaenonina elegans sp. nov.）。另有4个物种以开放命名法进行记述，分别为三脊卷螺？（Tricarilda? sp.）、侏罗卷螺？（Jurilda sp.）、柱泡螺？（Cylindrobullina sp.）以及科斯曼螺？（Cossmannina sp.）。其余物种均已有正式发表的研究记录：小壳盘虫（Coelodiscus minutus (Schübler in Zieten)）、四纹原锥螺（Procerithium quadrilineatum (Römer)）、波纹假卡托螺（Pseudokatosira undulata (Benz in von Zieten)）、近尖古似肋螺（Palaeorissoina aff. acuminata (Gründel, 1999b)）、单肋皮特螺（Pietteia unicarinata (Hudleston)）、类犬球形螺（Globularia cf. canina (Hudleston)）、里希特氏纹卷管螺近似型（Striactaeonina cf. richterorum Schulbert & Nützel）、近细纹纹卷管螺？（Striactaenonina aff. tenuistriata (Hudleston)）以及塞奇威克沟纹卷管螺（Sulcoactaeon sedgvici (Phillips)）。上述多数物种为其所属属的最早化石记录，且展现出古生物地理学上的亲缘关联……