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Ontogeny of highly variable ceratitid ammonoids from the Anisian (Middle Triassic)
Ammonoids reached their greatest diversity during the Triassic period. In the early Middle Triassic (Anisian) stage, ammonoid diversity was dominated by representatives of the family Ceratitidae. High taxonomic diversity can, however, be decoupled from their morphologic disparity. Due to its high ph...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
PeerJ Inc.
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7934684/ https://www.ncbi.nlm.nih.gov/pubmed/33717689 http://dx.doi.org/10.7717/peerj.10931 |
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author | Bischof, Eva Alexandra Schlüter, Nils Korn, Dieter Lehmann, Jens |
author_facet | Bischof, Eva Alexandra Schlüter, Nils Korn, Dieter Lehmann, Jens |
author_sort | Bischof, Eva Alexandra |
collection | PubMed |
description | Ammonoids reached their greatest diversity during the Triassic period. In the early Middle Triassic (Anisian) stage, ammonoid diversity was dominated by representatives of the family Ceratitidae. High taxonomic diversity can, however, be decoupled from their morphologic disparity. Due to its high phenotypic variability, the high diversity of ceratitids of the Anisian of Nevada was initially assumed to be caused by artificial over-splitting. This study aims to contribute data to settle this issue by applying geometric morphometrics methods, using landmarks and semi-landmarks, in the study of ontogenetic cross-sections of ammonoids for the first time. The results reveal that alterations in ontogenetic trajectories, linked to heterochronic processes, lead to the morphologic diversification of the species studied herein. Our knowledge, based on these ontogenetic changes, challenge the traditional treatment of species using solely adult characters for their distinction. This study furthermore demonstrates that the high diversity of the Anisian ammonoid assemblages of Nevada based on the traditional nomenclatoric approach is regarded to be reasonably accurate. |
format | Online Article Text |
id | pubmed-7934684 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | PeerJ Inc. |
record_format | MEDLINE/PubMed |
spelling | pubmed-79346842021-03-11 Ontogeny of highly variable ceratitid ammonoids from the Anisian (Middle Triassic) Bischof, Eva Alexandra Schlüter, Nils Korn, Dieter Lehmann, Jens PeerJ Biodiversity Ammonoids reached their greatest diversity during the Triassic period. In the early Middle Triassic (Anisian) stage, ammonoid diversity was dominated by representatives of the family Ceratitidae. High taxonomic diversity can, however, be decoupled from their morphologic disparity. Due to its high phenotypic variability, the high diversity of ceratitids of the Anisian of Nevada was initially assumed to be caused by artificial over-splitting. This study aims to contribute data to settle this issue by applying geometric morphometrics methods, using landmarks and semi-landmarks, in the study of ontogenetic cross-sections of ammonoids for the first time. The results reveal that alterations in ontogenetic trajectories, linked to heterochronic processes, lead to the morphologic diversification of the species studied herein. Our knowledge, based on these ontogenetic changes, challenge the traditional treatment of species using solely adult characters for their distinction. This study furthermore demonstrates that the high diversity of the Anisian ammonoid assemblages of Nevada based on the traditional nomenclatoric approach is regarded to be reasonably accurate. PeerJ Inc. 2021-03-02 /pmc/articles/PMC7934684/ /pubmed/33717689 http://dx.doi.org/10.7717/peerj.10931 Text en ©2021 Bischof et al. https://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited. |
spellingShingle | Biodiversity Bischof, Eva Alexandra Schlüter, Nils Korn, Dieter Lehmann, Jens Ontogeny of highly variable ceratitid ammonoids from the Anisian (Middle Triassic) |
title | Ontogeny of highly variable ceratitid ammonoids from the Anisian (Middle Triassic) |
title_full | Ontogeny of highly variable ceratitid ammonoids from the Anisian (Middle Triassic) |
title_fullStr | Ontogeny of highly variable ceratitid ammonoids from the Anisian (Middle Triassic) |
title_full_unstemmed | Ontogeny of highly variable ceratitid ammonoids from the Anisian (Middle Triassic) |
title_short | Ontogeny of highly variable ceratitid ammonoids from the Anisian (Middle Triassic) |
title_sort | ontogeny of highly variable ceratitid ammonoids from the anisian (middle triassic) |
topic | Biodiversity |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7934684/ https://www.ncbi.nlm.nih.gov/pubmed/33717689 http://dx.doi.org/10.7717/peerj.10931 |
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