五角星蛾(红蝇科);Diplobathrida)，韩国(东冈瓦纳)中奥陶世(Darriwilian)首次记录的照相类海百合

IF 1.3 4区地球科学 Q3 PALEONTOLOGY

Journal of Paleontology Pub Date : 2023-01-17 DOI:10.1017/jpa.2022.100

H. Park, Dong‐Chan Lee

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引用次数: 0

摘要

摘要描述了来自韩国吉贡山组的Goryeocrinus pentagrammos n.gen.n.sp.，它是从冈瓦纳大陆中奥陶世（中达里威阶）地层中记录到的第一个双壳虫。系统发育分析表明，G.pentagrammos n.gen.n.sp.是Diplobathrida的副系Rhodorinitidae的一员，与Laurentia晚奥陶世（Sandbian）的Paradabolocrinus亲缘关系最为密切。Goryeocrinus pentagrammos n.gen.n.sp.的特征是有一个五回的平碗状的花萼，一个由分叉的中间射线脊和五角基脊形成的明显的五语法脊，在第一排规则的射线间脊中至少有两个间脊，一个起源于CD射线间脊但靠近C射线径向的双轴脊，缺乏臂内肌和次臂间肌间肌。来自韩国（东冈瓦纳大陆）的G.pentagrammos n.gen.n.sp.的出现极大地扩大了摄象学家的奥陶纪古地理范围，而在劳伦蒂亚、西冈瓦纳、阿瓦隆尼亚和巴尔蒂卡都有记录。

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Goryeocrinus pentagrammos n. gen. n. sp. (Rhodocrinitidae; Diplobathrida), the first record of camerate crinoid from the Middle Ordovician (Darriwilian) of South Korea (East Gondwana)

Abstract. Goryeocrinus pentagrammos n. gen. n. sp. from the Jigunsan Formation of South Korea is described and is the first diplobathrid recorded from Middle Ordovician (middle Darriwilian) strata of East Gondwana. Phylogenetic analyses suggest that G. pentagrammos n. gen. n. sp. is a member of the paraphyletic Rhodocrinitidae of the Diplobathrida and most closely related to Paradiabolocrinus from the Late Ordovician (Sandbian) of Laurentia. Goryeocrinus pentagrammos n. gen. n. sp. is characterized by having a pentameral, flat bowl-shaped calyx, a conspicuous pentagrammatic ridge formed by bifurcated median ray ridge and pentagonal basal ridge, at least two interradials in the first row of regular interrays, an anitaxial ridge originating from the CD interray but close to the C ray radial, and lacking intrabrachials and interradials between secundibrachials. The occurrence of G. pentagrammos n. gen. n. sp. from South Korea (East Gondwana) drastically expands the Ordovician paleogeographic range of camerates, which otherwise have been recorded from Laurentia, West Gondwana, Avalonia, and Baltica.

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来源期刊

Journal of Paleontology 地学-古生物学

CiteScore

2.80

自引率

7.10%

发文量

审稿时长

6-12 weeks

期刊介绍： The Journal of Paleontology publishes original articles and notes on the systematics, phylogeny, paleoecology, paleogeography, and evolution of fossil organisms. It emphasizes specimen-based research and features high quality illustrations. All taxonomic groups are treated, including invertebrates, microfossils, plants, vertebrates, and ichnofossils.