A new species of the primitive stromatoporoid Cystostroma from the Ordovician of East Asia

Juwan Jeon, Qijian Li, Jae Ryong Oh, Suk Joo Choh, Dong Jin Lee

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6 Citations (Scopus)


A new species of the most primitive rosenellid stromatoporoid Cystostroma, C. primordia sp. nov. is reported from the Hunghuayuan Formation (Lower Ordovician, Floian) of Guizhou Province in the South China Block and the Duwibong Formation (Middle Ordovician, Darriwilian) of the Taebaeksan Basin in mid-eastern Korea (North China Block). This species is the first representative of the genus found in both the North and South China blocks. Cystostroma primordia sp. nov. is characterized by the absence of denticles and distinctively smaller cyst plates (height 0.04–0.20 mm, length 0.09–0.39 mm) than any other known species of Cystostroma. The presence of C. primordia sp. nov. in Lower to Middle Ordovician strata of western Gondwana challenges the long-held view of the late Middle Ordovician emergence of Paleozoic stromatoporoids. The simple internal morphological features of this new species and its occurrence in the Lower Ordovician of South China strongly indicate that an Early Ordovician Cystostroma-type precursor from western Gondwana is located near the base of the stromatoporoid stock. This occurrence greatly preceded the late Middle Ordovician (late Darriwilian) stromatoporoid diversification in circum-equatorial regions worldwide.

Original languageEnglish
Pages (from-to)547-556
Number of pages10
JournalGeosciences Journal
Issue number4
Publication statusPublished - 2019 Aug 1

Bibliographical note

Funding Information:
This paper is dedicated to the memory of Prof. Deyuan Dong of NIGPAS, who contributed significantly to the study of stromatoporoids of East Asia. This study was supported by grants from the National Research Foundation of Korea (2018R1A2A2A05018469) to SJC and (2018R1A2B2005578) to DJL, and from the National Natural Science Foundation of China (41521061 and XDB26000000) to QL. We deeply appreciate the constructive comments of two anonymous reviewers, which greatly improved the manuscript. We also thank K. Liang of NIGPAS and M. Lee of the Korea Polar Research Institute for their helpful comments on an earlier version of the manuscript.

Publisher Copyright:
© 2019, The Association of Korean Geoscience Societies and Springer.


  • China
  • Cystostroma primordia sp. nov
  • Darriwilian
  • Floian
  • Korea
  • Ordovician

ASJC Scopus subject areas

  • General Environmental Science
  • General Earth and Planetary Sciences


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