Diversity and morphological evolution of Jurassic belemnites from South Germany

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Details zur Publikation

Autorinnen und Autoren: Dera G, Toumoulin A, de Baets K
Zeitschrift: Palaeogeography, Palaeoclimatology, Palaeoecology
Jahr der Veröffentlichung: 2016
Band: 457
Seitenbereich: 80-97
ISSN: 0031-0182


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-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

de Baets, Kenneth PD Dr.
Lehrstuhl für Paläoumwelt

Einrichtungen weiterer Autorinnen und Autoren

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


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

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.


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