Data from: Disparid and hybocrinid crinoids (Echinodermata) from the Upper Ordovician (lower Katian) Brechin Lagerstätte of Ontario

The Brechin Lagerstätte (Katian, Ordovician) from the Lake Simcoe region of Ontario, Canada, contains a diverse array of echinoderms. Here, we describe seven disparid and two hybocrinid crinoids (Subclass Pentacrinoidea, Infraclass Inadunata), including a new disparid species belonging to the Anomalocrinidae (Order Homocrinida). In total, the disparids include Anomalocrinus astrictus n. sp.; Cremacrinus guttenbergensis Kolata, 1975; Cremacrinus inaequalis Billings, E., 1859; Daedalocrinus bellevillensis Billings, W.R., 1883; Eustenocrinus springeri Ulrich, 1925; Iocrinus trentonensis Walcott, 1883; and Isotomocrinus tenuis Billings, E., 1857b; and the hybocrinids include Hybocrinus tumidus Billings, E., 1857a and Hybocystites problematicus Wetherby, 1880. Previously known from only the holotype, three additional specimens of E. springeri expand our understanding of this unusual crinoid. Nomenclatural acts include the following: the recommendation of Warn and Strimple (1977), who designated Daedalocrinus kirki as a junior synonym of Daedalocrinus bellevillensis is followed; Hybocrinus pristinus Billings, E., 1858 is designated a junior synonym of Hybocrinus tumidus; and previous decisions are followed herein to retain Hybocystites eldonensis (Parks, 1908) as a junior synonym of Hybocystites problematicus. Although probably assignable to Anomalocrinus, the aberrant crinoid Glaucocrinus falconeri is designated a nomen dubium. Iocrinus similis (Billings, E., 1857a) is also designated a nomen dubium.

产自加拿大安大略省锡姆科湖区域的布雷钦特异埋藏化石库（Brechin Lagerstätte）（奥陶纪凯迪亚阶（Katian））产出了类群丰富的棘皮动物。本文记述了7种异海百合类（disparid crinoids）与2种海百合科（Hybocrinidae）海百合，这些类群隶属于五腕海百合亚纲（Pentacrinoidea）、不固着海百合下纲（Inadunata），其中包含1个归入异海百合科（Anomalocrinidae）、霍莫海百合目（Homocrinida）的新异海百合属物种。本次记述的异海百合类包括：窄形异海百合（Anomalocrinus astrictus n. sp.）、古滕贝格克雷默海百合（Cremacrinus guttenbergensis Kolata, 1975）、不等克雷默海百合（Cremacrinus inaequalis Billings, E., 1859）、贝勒维尔代达罗湖百合（Daedalocrinus bellevillensis Billings, W.R., 1883）、斯普林格优斯塔海百合（Eustenocrinus springeri Ulrich, 1925）、特伦顿爱克拉海百合（Iocrinus trentonensis Walcott, 1883）以及纤细等轴海百合（Isotomocrinus tenuis Billings, E., 1857b）；海百合科类群则包括：肿胀海百合（Hybocrinus tumidus Billings, E., 1857a）与问题囊海百合（Hybocystites problematicus Wetherby, 1880）。此前斯普林格优斯塔海百合仅知正模标本，本次新发现的3件标本拓展了我们对这一特殊海百合类群的认知。本研究的分类学处理事项如下：遵循Warn与Strimple（1977）的建议，将代达罗湖百合Kirki种（Daedalocrinus kirki）定为贝勒维尔代达罗湖百合的同物异名；将原始肿海百合（Hybocrinus pristinus Billings, E., 1858）指定为肿胀海百合的同物异名；同时沿用此前的分类决议，将埃尔登囊海百合（Hybocystites eldonensis (Parks, 1908)）保留为问题囊海百合的同物异名。尽管法氏灰海百合（Glaucocrinus falconeri）大概率可归入异海百合属，但仍被定为疑名（nomen dubium）；相似爱克拉海百合（Iocrinus similis (Billings, E., 1857a)）同样被定为疑名。