Analysis of septal spacing and septal crowding in Devonian and Carboniferous ammonoids
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...
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2021-10-01
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Series: | Swiss Journal of Palaeontology |
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Online Access: | https://doi.org/10.1186/s13358-021-00235-x |
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doaj-3fe85f181bd04bfb9928708b0938e6682021-10-10T11:49:26ZengSpringerOpenSwiss Journal of Palaeontology1664-23761664-23842021-10-01140112110.1186/s13358-021-00235-xAnalysis of septal spacing and septal crowding in Devonian and Carboniferous ammonoidsSophie Marie Beck0Kenneth De Baets1Christian Klug2Dieter Korn3Museum Für Naturkunde BerlinGeozentrum Nordbayern, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)Paläontologisches Institut Und Museum, Universität ZürichMuseum Für Naturkunde BerlinAbstract 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.https://doi.org/10.1186/s13358-021-00235-xAmmonoideaDevonianCarboniferousSeptal distancesOntogeny |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Sophie Marie Beck Kenneth De Baets Christian Klug Dieter Korn |
spellingShingle |
Sophie Marie Beck Kenneth De Baets Christian Klug Dieter Korn Analysis of septal spacing and septal crowding in Devonian and Carboniferous ammonoids Swiss Journal of Palaeontology Ammonoidea Devonian Carboniferous Septal distances Ontogeny |
author_facet |
Sophie Marie Beck Kenneth De Baets Christian Klug Dieter Korn |
author_sort |
Sophie Marie Beck |
title |
Analysis of septal spacing and septal crowding in Devonian and Carboniferous ammonoids |
title_short |
Analysis of septal spacing and septal crowding in Devonian and Carboniferous ammonoids |
title_full |
Analysis of septal spacing and septal crowding in Devonian and Carboniferous ammonoids |
title_fullStr |
Analysis of septal spacing and septal crowding in Devonian and Carboniferous ammonoids |
title_full_unstemmed |
Analysis of septal spacing and septal crowding in Devonian and Carboniferous ammonoids |
title_sort |
analysis of septal spacing and septal crowding in devonian and carboniferous ammonoids |
publisher |
SpringerOpen |
series |
Swiss Journal of Palaeontology |
issn |
1664-2376 1664-2384 |
publishDate |
2021-10-01 |
description |
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. |
topic |
Ammonoidea Devonian Carboniferous Septal distances Ontogeny |
url |
https://doi.org/10.1186/s13358-021-00235-x |
work_keys_str_mv |
AT sophiemariebeck analysisofseptalspacingandseptalcrowdingindevonianandcarboniferousammonoids AT kennethdebaets analysisofseptalspacingandseptalcrowdingindevonianandcarboniferousammonoids AT christianklug analysisofseptalspacingandseptalcrowdingindevonianandcarboniferousammonoids AT dieterkorn analysisofseptalspacingandseptalcrowdingindevonianandcarboniferousammonoids |
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