Data from: Camerate and disparid crinoids from the late Kinderhookian Meadville Shale, Cuyahoga Formation of Ohio

Crinoids were first reported from the Cuyahoga Formation in northeastern Ohio by James Hall in 1863. However, these crinoids have essentially not been re-examined in detail since the late 18th century. With the restudy of classical and more recent collections, ten (nine camerate and one disparid) species-level taxa are recognized from the late Kinderhookian Cuyahoga Formation, including the camerates Amphoracrinus viminalis (Hall, 1863); Aorocrinus helice Hall, 1863; Aorocrinus meyeri n. sp.; Aryballocrinus martini n. sp.; Cusacrinus daphne (Hall, 1863); Platycrinites s.l. contritus (Hall, 1863); Platycrinites s.l. graphicus (Hall, 1863); Platycrinites s.l. lodensis (Hall and Whitfield, 1875); and Platycrinites s.l. burki n. sp. In addition, Halysiocrinus sp. is the first disparid reported from this fauna. Platycrinites s.l. bedfordensis (Hall and Whitfield, 1875) is designated a nomen dubium. Growth is evaluated for Aorocrinus helice and Cusacrinus daphne, which had contrasting development. The Aorocrinus helice calyx was largely not allometric but the growth of the primaxil plate was, suggesting the arms may have grown allometrically. In contrast, much of the calyx of Cusacrinus daphne displayed allometric growth.

1863年，詹姆斯·霍尔（James Hall）首次在俄亥俄州东北部的凯霍加组（Cuyahoga Formation）中报道了海百合（Crinoid）化石。然而，自18世纪晚期以来，这批海百合化石基本未得到详细的重新研究。通过对经典馆藏及近年新采集标本的重新研究，本次研究在肯德霍克阶（Kinderhookian）晚期的凯霍加组中识别出10个种级分类单元，其中包含9个包腕海百合类（camerate）和1个异海百合类（disparid），具体类群包括：Amphoracrinus viminalis（Hall, 1863）、Aorocrinus helice Hall, 1863、新种Aorocrinus meyeri n. sp.、新种Aryballocrinus martini n. sp.、Cusacrinus daphne（Hall, 1863）、广义平海百合属Platycrinites s.l. contritus（Hall, 1863）、广义平海百合属Platycrinites s.l. graphicus（Hall, 1863）、广义平海百合属Platycrinites s.l. lodensis（Hall and Whitfield, 1875）以及新种Platycrinites s.l. burki n. sp.。此外，本次研究还报道了该化石群中的首个异海百合类类群——Halysiocrinus未定种（Halysiocrinus sp.）。Platycrinites s.l. bedfordensis（Hall and Whitfield, 1875）被指定为疑名（nomen dubium）。研究还对Aorocrinus helice与Cusacrinus daphne的生长模式进行了评估，二者的发育模式截然不同：Aorocrinus helice的萼部（calyx）整体基本呈等速生长，但初级腕板（primaxil plate）的生长为异速生长（allometric growth），这提示其腕部可能存在异速生长；与之相反，Cusacrinus daphne的萼部多数结构均表现出异速生长特征。