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A new stem group echinoid from the Triassic of China leads to a revised macroevolutionary history of echinoids during the end-Permian mass extinction.
R Soc Open Sci. 2018 Jan; 5(1):171548.RS

Abstract

The Permian-Triassic bottleneck has long been thought to have drastically altered the course of echinoid evolution, with the extinction of the entire echinoid stem group having taken place during the end-Permian mass extinction. The Early Triassic fossil record of echinoids is, however, sparse, and new fossils are paving the way for a revised interpretation of the evolutionary history of echinoids during the Permian-Triassic crisis and Early Mesozoic. A new species of echinoid, Yunnanechinus luopingensis n. sp. recovered from the Middle Triassic (Anisian) Luoping Biota fossil Lagerstätte of South China, displays morphologies that are not characteristic of the echinoid crown group. We have used phylogenetic analyses to further demonstrate that Yunnanechinus is not a member of the echinoid crown group. Thus a clade of stem group echinoids survived into the Middle Triassic, enduring the global crisis that characterized the end-Permian and Early Triassic. Therefore, stem group echinoids did not go extinct during the Palaeozoic, as previously thought, and appear to have coexisted with the echinoid crown group for at least 23 million years. Stem group echinoids thus exhibited the Lazarus effect during the latest Permian and Early Triassic, while crown group echinoids did not.

Authors+Show Affiliations

Department of Earth Sciences, University of Southern California, Zumberge Hall of Science, 3651 Trousdale Pkwy, Los Angeles, CA 90089-0740, USA.Chengdu Institute of Geology and Mineral Resources, Chengdu 610081, People's Republic of China. Chengdu Center of China Geological Survey, Chengdu 610081, People's Republic of China.Chengdu Institute of Geology and Mineral Resources, Chengdu 610081, People's Republic of China. Chengdu Center of China Geological Survey, Chengdu 610081, People's Republic of China.Department of Earth Sciences, University of Southern California, Zumberge Hall of Science, 3651 Trousdale Pkwy, Los Angeles, CA 90089-0740, USA.Florida Museum of Natural History, University of Florida, 1659 Museum Road, PO Box 117800, Gainesville, FL 32611, USA. Department of Geological Sciences, University of Florida, 241 Williamson Hall, PO Box 112120, Gainesville, FL 32611-2120, USA.Chengdu Institute of Geology and Mineral Resources, Chengdu 610081, People's Republic of China. Chengdu Center of China Geological Survey, Chengdu 610081, People's Republic of China.Chengdu Institute of Geology and Mineral Resources, Chengdu 610081, People's Republic of China. Chengdu Center of China Geological Survey, Chengdu 610081, People's Republic of China.Chengdu Institute of Geology and Mineral Resources, Chengdu 610081, People's Republic of China. Chengdu Center of China Geological Survey, Chengdu 610081, People's Republic of China.Department of Earth Sciences, University of Southern California, Zumberge Hall of Science, 3651 Trousdale Pkwy, Los Angeles, CA 90089-0740, USA.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

29410858

Citation

Thompson, Jeffrey R., et al. "A New Stem Group Echinoid From the Triassic of China Leads to a Revised Macroevolutionary History of Echinoids During the end-Permian Mass Extinction." Royal Society Open Science, vol. 5, no. 1, 2018, p. 171548.
Thompson JR, Hu SX, Zhang QY, et al. A new stem group echinoid from the Triassic of China leads to a revised macroevolutionary history of echinoids during the end-Permian mass extinction. R Soc Open Sci. 2018;5(1):171548.
Thompson, J. R., Hu, S. X., Zhang, Q. Y., Petsios, E., Cotton, L. J., Huang, J. Y., Zhou, C. Y., Wen, W., & Bottjer, D. J. (2018). A new stem group echinoid from the Triassic of China leads to a revised macroevolutionary history of echinoids during the end-Permian mass extinction. Royal Society Open Science, 5(1), 171548. https://doi.org/10.1098/rsos.171548
Thompson JR, et al. A New Stem Group Echinoid From the Triassic of China Leads to a Revised Macroevolutionary History of Echinoids During the end-Permian Mass Extinction. R Soc Open Sci. 2018;5(1):171548. PubMed PMID: 29410858.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A new stem group echinoid from the Triassic of China leads to a revised macroevolutionary history of echinoids during the end-Permian mass extinction. AU - Thompson,Jeffrey R, AU - Hu,Shi-Xue, AU - Zhang,Qi-Yue, AU - Petsios,Elizabeth, AU - Cotton,Laura J, AU - Huang,Jin-Yuan, AU - Zhou,Chang-Yong, AU - Wen,Wen, AU - Bottjer,David J, Y1 - 2018/01/31/ PY - 2017/10/05/received PY - 2017/12/21/accepted PY - 2018/2/8/entrez PY - 2018/2/8/pubmed PY - 2018/2/8/medline KW - Lazarus effect KW - Luoping Biota KW - Triassic KW - echinoderm KW - sea urchin SP - 171548 EP - 171548 JF - Royal Society open science JO - R Soc Open Sci VL - 5 IS - 1 N2 - The Permian-Triassic bottleneck has long been thought to have drastically altered the course of echinoid evolution, with the extinction of the entire echinoid stem group having taken place during the end-Permian mass extinction. The Early Triassic fossil record of echinoids is, however, sparse, and new fossils are paving the way for a revised interpretation of the evolutionary history of echinoids during the Permian-Triassic crisis and Early Mesozoic. A new species of echinoid, Yunnanechinus luopingensis n. sp. recovered from the Middle Triassic (Anisian) Luoping Biota fossil Lagerstätte of South China, displays morphologies that are not characteristic of the echinoid crown group. We have used phylogenetic analyses to further demonstrate that Yunnanechinus is not a member of the echinoid crown group. Thus a clade of stem group echinoids survived into the Middle Triassic, enduring the global crisis that characterized the end-Permian and Early Triassic. Therefore, stem group echinoids did not go extinct during the Palaeozoic, as previously thought, and appear to have coexisted with the echinoid crown group for at least 23 million years. Stem group echinoids thus exhibited the Lazarus effect during the latest Permian and Early Triassic, while crown group echinoids did not. SN - 2054-5703 UR - https://www.unboundmedicine.com/medline/citation/29410858/A_new_stem_group_echinoid_from_the_Triassic_of_China_leads_to_a_revised_macroevolutionary_history_of_echinoids_during_the_end_Permian_mass_extinction_ L2 - https://royalsocietypublishing.org/doi/10.1098/rsos.171548?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -
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