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

Tae-yoon Park, Jusun Woo, Dong-Jin Lee, Dong-Chan Lee, Seung-bae Lee, Zuozhen Han, Sung Kwun Chough and Duck K. Choi ()
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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

Nature Communications, 2011, vol. 2, issue 1, 1-6

Abstract: 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.

Date: 2011
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DOI: 10.1038/ncomms1457

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