Body-size trends of cyrtocrinids (Crinoidea,Cyrtocrinida) |
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| Affiliation: | 1. University of Silesia in Katowice, Faculty of Earth Sciences, Department of Palaeontology and Stratigraphy, Sosnowiec, Poland;2. WNoZ UŚ, Centre for Polar Studies KNOW (Leading National Research Centre), Katowice, Poland;1. University of Silesia, Department of Animal Histology and Embryology, Bankowa 9, 40-007 Katowice, Poland;2. Charles University, Faculty of Science, Department of Zoology, Vinicna 7, 128 44 Prague 2, Czech Republic;3. Institute of Soil Biology, Biology Centre AS CR, Na Sadkach 7, CZ-370 05 Ceske Budejovice, Czech Republic;1. Angela Marmont Centre for UK Biodiversity, The Natural History Museum, Cromwell Road, London SW7 5BD, UK;2. Department of Geology, Naturalis Biodiversity Center, Darwinweg 2, 2333 CR Leiden, The Netherlands;1. Équipe Tectonique-Terre-Temps-Traçage, Géosciences Rennes (UMR-CNRS 6118), Université de Rennes 1, 35042 Rennes Cedex, France;2. Laboratoire de paléontologie stratigraphique, Faculté libre des sciences et Technologies, 41 rue du Port, 59046 Lille Cedex, France;3. Groupe ISA, 48 boulevard Vauban, 59046 Lille Cedex, France;4. Le Verger-Beaucé, 35520 Mélesse, France;5. 17 rue du Hyl, 35510 Cesson-Sévigné, France;6. Royal Belgian Institute for Natural Sciences, Q.D. Earth and History of Life, Vautier Street 29, 3-1000 Brussels, Belgium;1. Department of Earth, Environment and Life Science, DiSTAV, University of Genoa, Italy;2. Laboratoire de Biologie marine CP160/15, Université Libre de Bruxelles, Av F.D. Roosevelt, 50, B-1050, Bruxelles, Belgium;3. Université de Nice-Sophia Antipolis, EA 4228 ECOMERS, Nice, France;4. Sorbonne Université, CNRS, Laboratoire d''Océanographie de Villefranche, 181 chemin du Lazaret, F 06230, Villefranche-sur-mer, France;5. Institute for Sustainable Development and International Relations, Sciences Po, 27 rue Saint Guillaume, F75007, Paris, France |
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| Abstract: | Cyrtocrinids (Cyrtocrinida) are fully sessile post-Palaeozoic crinoids (Crinoidea) of unusual morphology exhibiting complex diversity dynamics and evolutionary history. To date, however, no study has ever examined the macro-evolutionary patterns of body-size trends in these crinoids. A compilation of a body-size dataset for cyrtocrinid genera revealed a trend of increasing size throughout their evolutionary history. A maximum-likelihood approach showed that the observed trend is best characterized by a general random walk. Recorded body-size pattern is thus consistent with the Cope-Depéret's rule implying the existence of active, directional selective pressures towards larger body-sizes. The case provides a rare example of directional body-size trend in the fossil record. |
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| Keywords: | Echinodermata Crinoidea Body-size Morphometry Evolution Mesozoic Echinodermata Crinoidea Taille Morphométrie Évolution Mésozoïque |
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