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Acanthoclema (Rhabdomesina, Cryptostomata) from the Devonian of Europe

Acanthoclema from Devonian of Europe

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Bryozoan Studies 2010

Part of the book series: Lecture Notes in Earth System Sciences ((LNESS,volume 143))

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Abstract

The rhabdomesine genus Acanthoclema Hall, 1886 is known from the Devonian of North America and Eurasia. Many species referred to this genus were previously understood in a broad concept but do not belong to it. Six species of Acanthoclema are reported from the Devonian of Europe, which consistently show morphological characters shared with the type species. The generic diagnosis of Acanthoclema has been emended. The studied material was used for cluster analysis in order to reveal relationships between the six species of Acanthoclema and to compare them with Nikiforovella gracilis, a representative of the morphologically most similar genus. It is resumed that Nikiforovella derived from Acanthoclema in the Lower Devonian. These two genera show completely different trends in their evolution: a decrease of number of acanthostyles and metazooecia in Acanthoclema, and an increase of their number in Nikiforovella. A test using cluster analysis showed that Morisita’s index is very useful for the heterogeneous data.

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Acknowledgments

The present study is part of the project ER 278/4-1 and 2 supported by the Deutsche Forschungsgemeinschaft (DFG), and is a contribution to IGCP 499 “Devonian land-sea interaction: evolution of ecosystems and climate”. Priska Schäfer, Kiel, is thanked for reading of the manuscript and helpful comments. Roger Cuffey, Pennsylvania, and Patrick Wyse Jackson, Dublin, are thanked for their helpful reviews.

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  1. Institute of Geosciences, Kiel University, Ludewig-Meyn-Str. 10, Kiel, D-24118, Germany

    Andrej Ernst

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  1. Andrej Ernst
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Correspondence to Andrej Ernst .

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Editors and Affiliations

  1. Christian-Abstrechts-Universität zu Kiel, Institut für Geowissenschaften, Luedwig-Meyn-Straße 10, Kiel, 24118, Schleswig-Holstein, Germany

    Andrej Ernst

  2. Olshausenstr. 40, Kiel, 24098, Germany

    Priska Schäfer

  3. Forschungsinstitut und Naturmuseum Senck, Senckenberganlage 25, Frankfurt, 60325, Germany

    Joachim Scholz

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Ernst, A. (2013). Acanthoclema (Rhabdomesina, Cryptostomata) from the Devonian of Europe. In: Ernst, A., Schäfer, P., Scholz, J. (eds) Bryozoan Studies 2010. Lecture Notes in Earth System Sciences, vol 143. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-16411-8_4

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