Intraspecific variation of Svalbardiceras spitzbergensis (Frebold) from the Early Triassic (Spathian) of Spitsbergen
The ammonoid species Svalbardiceras spitzbergensis from the latest Early Triassic (Spathian, subrobustus Zone) shows a remarkable intraspecific variation. The more than 400 specimens studied come from one fossiliferous carbonate nodule layer within a sequence of mudstones and clayey siltstones of th...
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Norwegian Polar Institute
2008
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ftjpolarres:oai:journals.openacademia.net:article/2891 2023-05-15T18:02:42+02:00 Intraspecific variation of Svalbardiceras spitzbergensis (Frebold) from the Early Triassic (Spathian) of Spitsbergen Weitschat, Wolfgang 2008-12-01 application/pdf https://polarresearch.net/index.php/polar/article/view/2891 https://doi.org/10.3402/polar.v27i3.6185 eng eng Norwegian Polar Institute https://polarresearch.net/index.php/polar/article/view/2891/6518 https://polarresearch.net/index.php/polar/article/view/2891 doi:10.3402/polar.v27i3.6185 Copyright (c) 2018 Polar Research Polar Research; Vol. 27 No. 3 (2008): Special issue: The Boreal Triassic; 292-297 1751-8369 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2008 ftjpolarres https://doi.org/10.3402/polar.v27i3.6185 2021-11-11T19:13:21Z The ammonoid species Svalbardiceras spitzbergensis from the latest Early Triassic (Spathian, subrobustus Zone) shows a remarkable intraspecific variation. The more than 400 specimens studied come from one fossiliferous carbonate nodule layer within a sequence of mudstones and clayey siltstones of the Vikinghøgda Formation (Vendomdalen Member), mainly collected in the Sassendalen and Agardhbugta areas in central and eastern Svalbard, respectively. The preservation of the ammonoids is very good, usually with preserved shells and complete body chambers. Morphologically they range from compressed, more or less smooth platycones, with narrow umbilicus, to wide umbilicate, depressed forms with straight, prominent ribs. The morphological variation is continuous: all specimens belong to a single assemblage, and are variants of one biospecies. This phenomenon, which is quite common in Boreal Triassic ammonoid faunas, has in the past led to serious taxonomic oversplitting. Furthermore, this new example presents a serious challenge to current ideas about the close correlation between mode of life and shell morphology of ammonoids. Article in Journal/Newspaper Polar Research Svalbard Spitsbergen Polar Research (E-Journal) Svalbard Sassendalen ENVELOPE(17.211,17.211,78.266,78.266) Vikinghøgda ENVELOPE(23.167,23.167,-72.067,-72.067) Vendomdalen ENVELOPE(17.321,17.321,78.201,78.201) Polar Research 27 3 |
institution |
Open Polar |
collection |
Polar Research (E-Journal) |
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ftjpolarres |
language |
English |
description |
The ammonoid species Svalbardiceras spitzbergensis from the latest Early Triassic (Spathian, subrobustus Zone) shows a remarkable intraspecific variation. The more than 400 specimens studied come from one fossiliferous carbonate nodule layer within a sequence of mudstones and clayey siltstones of the Vikinghøgda Formation (Vendomdalen Member), mainly collected in the Sassendalen and Agardhbugta areas in central and eastern Svalbard, respectively. The preservation of the ammonoids is very good, usually with preserved shells and complete body chambers. Morphologically they range from compressed, more or less smooth platycones, with narrow umbilicus, to wide umbilicate, depressed forms with straight, prominent ribs. The morphological variation is continuous: all specimens belong to a single assemblage, and are variants of one biospecies. This phenomenon, which is quite common in Boreal Triassic ammonoid faunas, has in the past led to serious taxonomic oversplitting. Furthermore, this new example presents a serious challenge to current ideas about the close correlation between mode of life and shell morphology of ammonoids. |
format |
Article in Journal/Newspaper |
author |
Weitschat, Wolfgang |
spellingShingle |
Weitschat, Wolfgang Intraspecific variation of Svalbardiceras spitzbergensis (Frebold) from the Early Triassic (Spathian) of Spitsbergen |
author_facet |
Weitschat, Wolfgang |
author_sort |
Weitschat, Wolfgang |
title |
Intraspecific variation of Svalbardiceras spitzbergensis (Frebold) from the Early Triassic (Spathian) of Spitsbergen |
title_short |
Intraspecific variation of Svalbardiceras spitzbergensis (Frebold) from the Early Triassic (Spathian) of Spitsbergen |
title_full |
Intraspecific variation of Svalbardiceras spitzbergensis (Frebold) from the Early Triassic (Spathian) of Spitsbergen |
title_fullStr |
Intraspecific variation of Svalbardiceras spitzbergensis (Frebold) from the Early Triassic (Spathian) of Spitsbergen |
title_full_unstemmed |
Intraspecific variation of Svalbardiceras spitzbergensis (Frebold) from the Early Triassic (Spathian) of Spitsbergen |
title_sort |
intraspecific variation of svalbardiceras spitzbergensis (frebold) from the early triassic (spathian) of spitsbergen |
publisher |
Norwegian Polar Institute |
publishDate |
2008 |
url |
https://polarresearch.net/index.php/polar/article/view/2891 https://doi.org/10.3402/polar.v27i3.6185 |
long_lat |
ENVELOPE(17.211,17.211,78.266,78.266) ENVELOPE(23.167,23.167,-72.067,-72.067) ENVELOPE(17.321,17.321,78.201,78.201) |
geographic |
Svalbard Sassendalen Vikinghøgda Vendomdalen |
geographic_facet |
Svalbard Sassendalen Vikinghøgda Vendomdalen |
genre |
Polar Research Svalbard Spitsbergen |
genre_facet |
Polar Research Svalbard Spitsbergen |
op_source |
Polar Research; Vol. 27 No. 3 (2008): Special issue: The Boreal Triassic; 292-297 1751-8369 |
op_relation |
https://polarresearch.net/index.php/polar/article/view/2891/6518 https://polarresearch.net/index.php/polar/article/view/2891 doi:10.3402/polar.v27i3.6185 |
op_rights |
Copyright (c) 2018 Polar Research |
op_doi |
https://doi.org/10.3402/polar.v27i3.6185 |
container_title |
Polar Research |
container_volume |
27 |
container_issue |
3 |
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1766173206600744960 |