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Cambrian echinoderm diversity and palaeobiogeography

By
Samuel Zamora
Samuel Zamora
Department of Palaeontology, Natural History Museum, Cromwell Road, London SW7 5BD, UK
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Bertrand Lefebvre
Bertrand Lefebvre
UMR CNRS 5276, Université Lyon 1 & ENS-Lyon, 69622 Villeurbanne, France
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J. Javier Álvaro
J. Javier Álvaro
Centro de Astrobiología (CSIC/INTA), Ctra. de Torrejón a Ajalvir km 4, 28850 Torrejón de Ardoz, Spain
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Sébastien Clausen
Sébastien Clausen
Géosystèmes, UMR 8157 and 7207 CNRS, Université des Sciences et Technologies de Lille, 59655 Villeneuve d'Ascq, France
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Olaf Elicki
Olaf Elicki
Geological Institute, Freiberg University, Bernhard-von-Cotta Street 2, 09599 Freiberg, Germany
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Oldrich Fatka
Oldrich Fatka
Department of Geology and Palaeontology, Faculty of Science, Charles University, Albertov 6, Praha 2, 128 43 Czech Republic
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Peter Jell
Peter Jell
Queensland Museum, PO Box 3300, South Brisbane, Queensland 4101, Australia
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Artem Kouchinsky
Artem Kouchinsky
Department of Palaeozoology, Swedish Museum of Natural History, Box 50007, SE-104 05 Stockholm, Sweden
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Jih-Pai Lin
Jih-Pai Lin
State Key Laboratory of Paleobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, 39 East Beijing Road, Nanjing 210008, China
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Elise Nardin
Elise Nardin
UMR CNRS-UPS-IRD 5563 Géosciences Environnement Toulouse, Observatoire Midi-Pyrénées, F-31400 Toulouse, France
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Ronald Parsley
Ronald Parsley
Department of Earth and Environmental Sciences, Tulane University, New Orleans, LA 70118, USA
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Sergei Rozhnov
Sergei Rozhnov
Paleontological Institute RAS, Profsoyuznaya St 123, 117997 Moscow, Russia
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James Sprinkle
James Sprinkle
Department of Geological Sciences, Jackson School of Geosciences, University of Texas, Austin, TX 78712-0254, USA
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Colin D. Sumrall
Colin D. Sumrall
Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, TN 37996, USA
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Daniel Vizcaïno
Daniel Vizcaïno
7 rue J.-B. Chardin, Maquens, 11090 Carcassonne, France
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Andrew B. Smith
Andrew B. Smith
Department of Palaeontology, Natural History Museum, Cromwell Road, London SW7 5BD, UK
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Published:
January 01, 2013

Abstract

The distribution of all known Cambrian echinoderm taxa, encompassing both articulated specimens and taxonomically diagnostic isolated ossicles, is documented for the first time. The database described by 2011 comprises 188 species recorded from 65 formations from around the world. Formations that have yielded articulated echinoderms are unequally distributed in space and time. Only Laurentia and West Gondwana provide reasonably complete records at the resolution of Stage. The review of the biogeographical distributions of the eight major echinoderm clades shows that faunas from Laurentia and Northeast Gondwana (China and Korea) are distinct from those of West Gondwana and Southeast Gondwana (Australia); other regions are too poorly sampled to make firm palaeobiogeographical statements. Analysis of alpha diversity (species per formation) shows that diversity rose initially to Cambrian Stage 5, declined into Guzhangian and Paibian before returning to Stage 5 levels by the end of the Cambrian. This pattern is replicated in Laurentia and West Gondwana. We show that taxonomically diagnostic ossicles found in isolation typically occur significantly earlier than the first articulated specimens of the same taxa and provide important information on the first occurrence and palaeobiogeographical distribution of key taxa, and of the phylum as a whole.

Supplementary material:

Articulated Cambrian echinoderms and Isolated plates of Cambrian echinoderms are provided at: http://www.geolsoc.org.uk/SUP18668

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Contents

Geological Society, London, Memoirs

Early Palaeozoic Biogeography and Palaeogeography

D. A. T. Harper
D. A. T. Harper
Durham University, UK
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T. Servais
T. Servais
CNRS–Université de Lille 1, France
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Geological Society of London
Volume
38
ISBN electronic:
9781862396425
Publication date:
January 01, 2013

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