About the Authors
- Martin Košťák
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* Email: martin.kostak@natur.cuni.cz
Affiliation Institute of Geology and Palaeontology, Faculty of Science, Charles University, Prague, Czech Republic
- John W. M. Jagt
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Affiliation Natuurhistorisch Museum Maastricht, Maastricht, The Netherlands
- Robert P. Speijer
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Affiliation Katholieke Universiteit Leuven, Leuven, Belgium
- Peter Stassen
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Affiliation Katholieke Universiteit Leuven, Leuven, Belgium
- Etienne Steurbaut
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Affiliations Katholieke Universiteit Leuven, Leuven, Belgium, Royal Belgian Institute of Natural Sciences, Brussels, Belgium
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
Analyzed the data: MK JWMJ RS ES. Contributed reagents/materials/analysis tools: RPS PS ES. Wrote the manuscript: MK JWMJ RPS ES. Carried out mechanical and optical analyses: MK.