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 LeeEmail author


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.

Key words

Cystostroma primordia sp. nov. Ordovician Floian Darriwilian China Korea 


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Copyright information

© The Association of Korean Geoscience Societies and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Juwan Jeon
    • 1
  • Qijian Li
    • 2
    • 3
  • Jae-Ryong Oh
    • 4
    • 5
  • Suk-Joo Choh
    • 6
  • Dong-Jin Lee
    • 1
    Email author
  1. 1.Department of Earth and Environmental SciencesAndong National UniversityAndongRepublic of Korea
  2. 2.CAS Key Laboratory of Economic Stratigraphy and PalaeogeographyNanjing Institute of Geology and PalaeontologyNanjingChina
  3. 3.Center for Excellence in Life and PaleoenvironmentChinese Academy of SciencesNanjingChina
  4. 4.Division of Polar Earth-System SciencesKorea Polar Research InstituteIncheonRepublic of Korea
  5. 5.Polar ScienceUniversity of Science and TechnologyDaejeonRepublic of Korea
  6. 6.Department of Earth and Environmental SciencesKorea UniversitySeoulRepublic of Korea

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