Upper Ordovician (Katian) strata of the Lake Simcoe region of Ontario record a spectacularly diverse and abundant echinoderm fauna known as the Brechin Lagerstätte. Despite recognition as the most taxonomically diverse Katian crinoid paleocommunity, the Brechin Lagerstätte has received relatively little taxonomic study since Frank Springer published his classic monograph on the “Kirkfield fauna” in 1911.Using a new collection of exceptionally preserved material, we evaluate all dicyclic inadunate crinoids occurring in the Brechin Lagerstätte, which is predominantly comprised of cladids (Eucladida and Flexibilia). We document 15 species across 11 genera, including descriptions of two new genera and four new species. New taxa include Konieckicrinus brechinensis n. gen. n. sp., K. josephi n. gen. n. sp., Simcoecrinus mahalaki n. gen. n. sp., and Dendrocrinus simcoensis n. sp.Although cladids are not commonly considered major components of the Early Paleozoic Crinoid Macroevolutionary Fauna, which is traditionally conceived as dominated by disparids and diplobathrid camerates, they are the most diverse major lineage of crinoids occurring in the Brechin Lagerstätte. This unexpected result highlights the important roles of specimen-based taxonomy and systematic revisions in the study of large-scale diversity patterns.UUID: http://zoobank.org/09dda7c2-f2c5-4411-93be-3587ab1652ab

中文翻译：

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奥陶纪 Brechin Lagerstätte 枝状海百合的生物多样性、系统学和新分类群

安大略省锡姆科湖地区的上奥陶纪（Katian）地层记录了被称为 Brechin Lagerstätte 的极其多样化和丰富的棘皮动物群。尽管被公认为是分类学上最多样化的凯蒂海百合古群落，但自从弗兰克·斯普林格 (Frank Springer) 于 1911 年发表他关于“柯克菲尔德动物群”的经典专着以来，Brechin Lagerstätte 接受的分类学研究相对较少。我们使用一组保存完好的新材料，评估所有双环动物群海百合发生在 Brechin Lagerstätte，主要由枝状体（Eucladida 和 Flexibilia）组成。我们记录了 11 个属的 15 个物种，包括对两个新属和四个新物种的描述。新分类群包括布氏金龟子n. 将军 n. sp.,ķ.约瑟夫n. 将军 n. sp.,马哈拉基辛克氏菌n. 将军 n. sp.，和石竹n. sp.虽然枝科动物通常不被认为是早期古生代海百合宏观进化动物群的主要组成部分，传统上认为这些动物主要由 disparids 和 dilobathrid camerates 主导，但它们是 Brechin Lagerstätte 中出现的最多样化的主要海百合谱系。这一出乎意料的结果突出了基于标本的分类学和系统修订在大规模多样性模式研究中的重要作用。UUID：http://zoobank.org/09dda7c2-f2c5-4411-93be-3587ab1652ab