Analysis of septal spacing and septal crowding in Devonian and Carboniferous ammonoids
Beck SM, de Baets K, Klug C, Korn D (2021)
Publication Type: Journal article, Original article
Publication year: 2021
Journal
Original Authors: Sophie Marie Beck, Kenneth De Baets, Christian Klug, Dieter Korn
Book Volume: 140
Article Number: 21
Issue: 1
DOI: 10.1186/s13358-021-00235-x
Open Access Link: https://doi.org/10.1186/s13358-021-00235-x
Abstract
Septal crowding is widely known as a sign of maturity in conchs of ammonoids and nautiloids. However, reduced septal spacing may also occur as a consequence of adverse ecological conditions. Here, we address the question how septal spacing varied through ontogeny in representatives of some of the major clades of Devonian and Carboniferous ammonoids. We found that the degree of ontogenetic variation is similar between clades and that variation is only weakly linked with conch form. The results show that septal crowding alone is insufficient to identify adulthood in ammonoids; intermediate septal crowding is a common phenomenon and occurs in various growth stages. Changes in septal distances during ontogeny were, in addition to adulthood of the individuals, a passive reaction likely caused by fluctuating environmental conditions.
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Germany (DE)
Switzerland (CH)How to cite
APA:
Beck, S.M., de Baets, K., Klug, C., & Korn, D. (2021). Analysis of septal spacing and septal crowding in Devonian and Carboniferous ammonoids. Swiss Journal of Palaeontology, 140. https://dx.doi.org/10.1186/s13358-021-00235-x
MLA:
Beck, Sophie Marie, et al. "Analysis of septal spacing and septal crowding in Devonian and Carboniferous ammonoids." Swiss Journal of Palaeontology 140 (2021).
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