Diversity and morphological evolution of Jurassic belemnites from South Germany

Journal article
(Original article)


Publication Details

Author(s): Dera G, Toumoulin A, de Baets K
Journal: Palaeogeography, Palaeoclimatology, Palaeoecology
Publisher: ELSEVIER SCIENCE BV
Publication year: 2016
Volume: 457
Pages range: 80-97
ISSN: 0031-0182


Abstract


Belemnites are extinct cephalopods whose evolutionary history is representative of successful adaptive radiations during the Mesozoic. Nevertheless, a detailed understanding of the dynamics and palaeoenvironmental drivers of this evolution is still lacking. In order to fill this gap, we analyze the diversity and morphological disparity of Jurassic rostra from South Germany, and compare these patterns with other Euro-Boreal trends. We show that, after an early apparition of few dissimilar groups during the Hettangian Sinemurian interval, belemnites experienced four periods of diversification (i.e., Early Pliensbachian, Middle Late Toarcian, Early Bajocian, and Oxfordian) marked by morphological disparifications of rostra towards forms potentially optimized for different hydrodynamic properties. These adaptive radiations were interrupted at regional scale by four biological crises corresponding to morphological bottlenecks (i.e., Pliensbachian Toarcian, Aalenian, Late Bajocian, and Kimmeridgian). Most of them were morphoselective, except the Aalenian extinction, which could be related to a prominent sea level fall. By comparing our results to palaeoenvironmental data, we show that warm temperate seawater temperatures might have favoured the diversification of belemnites, potentially by accelerating their metabolic rates, the population turnovers, and the evolutionary rates on the long term. Conversely, cooling or hyperthermal events correspond with biological crises. Migrations towards refuge areas located in the Arctic and Mediterranean domains could have been key factors for rapid post-crisis recoveries. Finally, the available data suggest a trend towards increased streamlining of the rostrum through the Jurassic. (C) 2016 Elsevier B.V. All rights reserved.



FAU Authors / FAU Editors

de Baets, Kenneth Dr.
Lehrstuhl für Paläoumwelt


External institutions
Centre Européen de Recherche et d’Enseignement des Géosciences de l’Environnement (CEREGE)
Université Toulouse III - Paul Sabatier


How to cite

APA:
Dera, G., Toumoulin, A., & de Baets, K. (2016). Diversity and morphological evolution of Jurassic belemnites from South Germany. Palaeogeography, Palaeoclimatology, Palaeoecology, 457, 80-97. https://dx.doi.org/10.1016/j.palaeo.2016.05.029

MLA:
Dera, Guillaume, Agathe Toumoulin, and Kenneth de Baets. "Diversity and morphological evolution of Jurassic belemnites from South Germany." Palaeogeography, Palaeoclimatology, Palaeoecology 457 (2016): 80-97.

BibTeX: 

Last updated on 2018-08-08 at 00:45