Cambrian Stem‐group Cnidarians with a New Species from the Cambrian Series 3 of the Taebaeksan Basin, Korea
Cambrian Stem‐group Cnidarians with a New Species from the Cambrian Series 3 of the Taebaeksan Basin, Korea
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DOI：
10.1111/1755-6724.12726
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发表时间：
2016-06
期刊：
影响因子：
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通讯作者：
T. Park;Ji-Hoon Kihm;J. Woo;Y. Zhen;Michael J. Engelbretsen;Jongsun Hong;S. Choh;Dong-Jin Lee
中科院分区：
文献类型：
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作者：
T. Park;Ji-Hoon Kihm;J. Woo;Y. Zhen;Michael J. Engelbretsen;Jongsun Hong;S. Choh;Dong-Jin Lee
五个物种，Lipopora lissa Jell和Jell，1976年，Lipopora daseia Jell和Jell，1976年，Tretocylichne perplexa Engelbretsen，1993年来自澳大利亚，Cambroctoconus orientalis Park，Woo，Lee，Lee，Lee，Han和Chough，2011年来自中国，Cambroctoconus korzstanicus Peel，2014年来自吉尔吉斯斯坦，属于寒武纪茎群刺胞动物。朝鲜康布罗锥虫Cambroctoconus coreaensis sp. nov.在此解释为茎群刺胞动物，来自朝鲜半岛中东部太白山盆地太白群（寒武统3）大邑组石溪溪剖面，具有细长的杯状骨架。分支分析产生了21个最简约的树，它们总是将6个茎组刺胞动物置于冠组之下，但它们在茎组内的关系尚未解决。21棵树中有9棵树表明寒武纪茎组刺胞动物的单系关系，而在另外6棵树中，Cambroctoconus和Tretocylichne的单系似乎是冠组刺胞动物的姐妹群，其中Lipopora位于最基部的分支。这一结果可能反映了冠群刺胞动物在前寒武纪进化的事实，并表明茎群刺胞动物的多样性是寒武纪独立辐射的结果。
Five species, Lipopora lissa Jell and Jell, 1976, Lipopora daseia Jell and Jell, 1976, Tretocylichne perplexa Engelbretsen, 1993 from Australia, Cambroctoconus orientalis Park, Woo, Lee, Lee, Lee, Han and Chough, 2011 from China, and Cambroctoconus kyrgyzstanicus Peel, 2014 from Kyrgyzstan, belonging to the Cambrian stem‐group cnidarians have been documented in the fossil record. Cambroctoconus coreaensis sp. nov., interpreted here as a stem‐group cnidarian, from the Seokgaejae section in the Daegi Formation, Taebaek Group (Cambrian Series 3), Taebaeksan Basin, central‐eastern Korean Peninsula, has a slender cup‐shaped skeleton. A cladistic analysis produced 21 most parsimonious trees, which invariably placed the six stem‐group cnidarians below the crown‐group, but their relationships within the stem‐group are unresolved. Nine out of the 21 trees suggest a monophyletic relationship for the Cambrian stem‐group cnidarians, whereas in six other trees a monophyly of Cambroctoconus and Tretocylichne appeared as the sister‐group to the crown‐group cnidarians with Lipopora at the most basal branch. This result may reflect the fact that crown‐group cnidarians evolved in the Precambrian, and suggests that the diversity of stem‐group cnidarians was a result of an independent radiation in the Cambrian.