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Tremadocian stylophoran echinoderms from the Taebaeksan Basin, Korea

Published online by Cambridge University Press:  14 July 2015

Seung-Bae Lee ,
Bertrand Lefebvre  and
Duck K. Choi
Seung-Bae Lee
Affiliation:
School of Earth and Environmental Sciences, Seoul National University, Seoul 151-747, Korea,
Bertrand Lefebvre
Affiliation:
School of Earth and Environmental Sciences, Seoul National University, Seoul 151-747, Korea,
Duck K. Choi
Affiliation:
School of Earth and Environmental Sciences, Seoul National University, Seoul 151-747, Korea,
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Abstract

Abundant isolated elements of cornute and mitrate stylophorans were recovered from the upper Tremadocian Tumugol Formation in the Taebaeksan Basin, Korea. Cornute skeletal elements comprise a diverse assemblage of marginals and brachials of cothurnocystid affinities, suggesting the presence of no fewer than four different species. Mitrate remains include numerous isolated adorals, marginals, and aulacophoral plates with typical peltocystidan morphologies. Two adorals are identified as Anatifopsis sp., while all the others are attributable to A. cocaban. However, the two previously documented peltocystidans of Korea, A. cocaban and A. truncata, are sufficiently distinct from other Anatifopsis species to warrant assignment to a new genus, Taebaekocystis. Cladistic analyses suggest that Lagynocystida is the sister group of the clade uniting peltocystidans and mitrocystitidans and that the adorals of Taebaekocystis n. gen. and associated isolated peltocystidan elements possibly account for several different types of peltocystidans, intermediate in morphology between Peltocystidae and Kirkocystidae.

Type
Research Article
Information
Journal of Paleontology , Volume 80 , Issue 6 , November 2006 , pp. 1072 - 1086
Copyright
Copyright © The Paleontological Society 

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