Data from: An echinoderm Lagerstätte from the Upper Ordovician (Katian), Ontario: taxonomic re-evaluation and description of new dicyclic camerate crinoids

The Upper Ordovician (lower Katian) Bobcaygeon and Verulam formations from the Lake Simcoe region of Ontario contain a highly diverse echinoderm assemblage that is herein recognized as a Konservat-Lagerstätte. Although fossil crinoids have long been recognized from these formations, the fauna has not received a comprehensive taxonomic evaluation since Springer’s classic 1911 monograph. Recent extensive collection and preparation of new material from the Bobcaygeon and Verulam formations near Brechin, Ontario recovered numerous exceptionally preserved crinoid specimens with arms, stems, and attachment structures intact. The Brechin Lagerstätte is the most taxonomically diverse Katian crinoid fauna, with more than 20 crinoid genera represented in this collection.
Here, all dicyclic crinoids belonging to subclass Camerata from the Brechin Lagerstätte are evaluated. The following four genera and seven species are described from the fauna, including one new genus and four new species: Reteocrinus stellaris, Reteocrinus alveolatus, Archaeocrinus sundayi n. sp., Archaeocrinus maraensis n. sp., Priscillacrinus elegans n. gen. n. sp., Cleiocrinus regius, and Cleiocrinus lepidotus n. sp. The exceptional preservation of this collection provides an opportunity to describe more fully the morphologic and ontogenetic details of known Ordovician crinoid taxa, to conduct a taxonomic re-evaluation of many species, to describe new taxa, and to provide a framework for subsequent studies of crinoid community paleoecology.

产自加拿大安大略省锡姆科湖地区的上奥陶统（卡特阶下部）Bobcaygeon组与Verulam组产出物种多样性极高的棘皮动物组合，本文将其识别为一处特异埋藏化石库（Konservat-Lagerstätte）。尽管此前早已在上述地层中发现了化石海百合，但自Springer于1911年发表经典专著以来，该动物群尚未得到全面的分类学评估。近期，研究人员对安大略省布雷钦附近的Bobcaygeon组与Verulam组地层开展了大规模标本采集与制备工作，采获了大量保存极为完好的海百合标本，其腕、茎以及附着结构均完整保存。布雷钦特异埋藏化石库是卡特阶地层中分类多样性最高的海百合动物群，本次采集的标本涵盖了超过20个海百合属。

本文对布雷钦特异埋藏化石库中隶属于闭壳亚纲（Camerata）的双环海百合类开展了分类学研究。本次研究共记述该动物群中的4属7种，其中包括1个新属与4个新种：星状网海百合Reteocrinus stellaris、蜂窝网海百合Reteocrinus alveolatus、Archaeocrinus sundayi 新种、Archaeocrinus maraensis 新种、Priscilacrinus elegans 新属新种、Cleiocrinus regius以及Cleiocrinus lepidotus 新种。本次采集的标本保存状态极佳，为我们更全面地描述已知奥陶纪海百合类群的形态学与个体发育细节、对诸多物种开展分类学重新评估、记述新的分类单元，以及为后续海百合群落古生态学研究搭建框架提供了重要契机。