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A stem-group cnidarian described from the mid-Cambrian of China and its significance for cnidarian evolution

Author

Listed:
  • Tae-yoon Park

    (School of Earth and Environmental Sciences, Seoul National University)

  • Jusun Woo

    (Korea Polar Research Institute)

  • Dong-Jin Lee

    (Andong National University)

  • Dong-Chan Lee

    (Daejeon Health Sciences College)

  • Seung-bae Lee

    (School of Earth and Environmental Sciences, Seoul National University)

  • Zuozhen Han

    (College of Geo-information Science and Technology, Shandong University of Science and Technology)

  • Sung Kwun Chough

    (School of Earth and Environmental Sciences, Seoul National University)

  • Duck K. Choi

    (School of Earth and Environmental Sciences, Seoul National University)

Abstract

Palaeontological data of extinct groups often sheds light on the evolutionary sequences leading to extant groups, but has failed to resolve the basal metazoan phylogeny including the origin of the Cnidaria. Here we report the occurrence of a stem-group cnidarian, Cambroctoconus orientalis gen. et sp. nov., from the mid-Cambrian of China, which is a colonial organism with calcareous octagonal conical cup-shaped skeletons. It bears cnidarian features including longitudinal septa arranged in octoradial symmetry and colonial occurrence, but lacks a jelly-like mesenchyme. Such morphological characteristics suggest that the colonial occurrence with polyps of octoradial symmetry is the plesiomorphic condition of the Cnidaria and appeared earlier than the jelly-like mesenchyme during the course of evolution.

Suggested Citation

  • Tae-yoon Park & Jusun Woo & Dong-Jin Lee & Dong-Chan Lee & Seung-bae Lee & Zuozhen Han & Sung Kwun Chough & Duck K. Choi, 2011. "A stem-group cnidarian described from the mid-Cambrian of China and its significance for cnidarian evolution," Nature Communications, Nature, vol. 2(1), pages 1-6, September.
    • Handle: RePEc:nat:natcom:v:2:y:2011:i:1:d:10.1038_ncomms1457
    DOI: 10.1038/ncomms1457
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