Cambrian Stem-group Cnidarians with a New Species from the Cambrian Series 3 of the Taebaeksan Basin, Korea

Tae Yoon S PARK, Ji Hoon KIHM, Jusun WOO, Yong Yi ZHEN, Michael ENGELBRETSEN, Jongsun HONG, Suk-Joo Choh, Dong Jin LEE

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Abstract

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.

Original languageEnglish
Pages (from-to)827-837
Number of pages11
JournalActa Geologica Sinica
Volume90
Issue number3
DOIs
Publication statusPublished - 2016 Jun 1

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Keywords

  • Cambrian
  • Cnidaria
  • Drumian
  • Korea
  • Phylogeny
  • Taebaeksan Basin

ASJC Scopus subject areas

  • Geology

Cite this

PARK, T. Y. S., KIHM, J. H., WOO, J., ZHEN, Y. Y., ENGELBRETSEN, M., HONG, J., Choh, S-J., & LEE, D. J. (2016). Cambrian Stem-group Cnidarians with a New Species from the Cambrian Series 3 of the Taebaeksan Basin, Korea. Acta Geologica Sinica, 90(3), 827-837. https://doi.org/10.1111/1755-6724.12726