A New Late Miocene Odobenid (Mammalia: Carnivora) from Hokkaido, Japan Suggests Rapid Diversification of Basal Miocene Odobenids.
The modern walrus, Odobenus rosmarus, is specialized and only extant member of the family Odobenidae. They were much more diversified in the past, and at least 16 genera and 20 species of fossil walruses have been known. Although their diversity increased in the late Miocene and Pliocene (around 8-2...
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ftdoajarticles:oai:doaj.org/article:b9d8c44c118a479dbcbfdd97a375ebb5 2023-05-15T17:52:25+02:00 A New Late Miocene Odobenid (Mammalia: Carnivora) from Hokkaido, Japan Suggests Rapid Diversification of Basal Miocene Odobenids. Yoshihiro Tanaka Naoki Kohno 2015-01-01T00:00:00Z https://doi.org/10.1371/journal.pone.0131856 https://doaj.org/article/b9d8c44c118a479dbcbfdd97a375ebb5 EN eng Public Library of Science (PLoS) http://europepmc.org/articles/PMC4526471?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0131856 https://doaj.org/article/b9d8c44c118a479dbcbfdd97a375ebb5 PLoS ONE, Vol 10, Iss 8, p e0131856 (2015) Medicine R Science Q article 2015 ftdoajarticles https://doi.org/10.1371/journal.pone.0131856 2022-12-31T00:55:43Z The modern walrus, Odobenus rosmarus, is specialized and only extant member of the family Odobenidae. They were much more diversified in the past, and at least 16 genera and 20 species of fossil walruses have been known. Although their diversity increased in the late Miocene and Pliocene (around 8-2 Million years ago), older records are poorly known. A new genus and species of archaic odobenid, Archaeodobenus akamatsui, gen. et sp. nov. from the late Miocene (ca. 10.0-9.5 Ma) top of the Ichibangawa Formation, Hokkaido, northern Japan, suggests rapid diversification of basal Miocene walruses. Archaeodobenus akamatsui is the contemporaneous Pseudotaria muramotoi from the same formation, but they are distinguishable from each other in size and shape of the occipital condyle, foramen magnum and mastoid process of the cranium, and other postcranial features. Based on our phylogenetic analysis, A. akamatsui might have split from P. muramotoi at the late Miocene in the western North Pacific. This rapid diversification of the archaic odobenids occurred with a combination of marine regression and transgression, which provided geological isolation among the common ancestors of extinct odobenids. Article in Journal/Newspaper Odobenus rosmarus walrus* Directory of Open Access Journals: DOAJ Articles Pacific PLOS ONE 10 8 e0131856 |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Medicine R Science Q |
spellingShingle |
Medicine R Science Q Yoshihiro Tanaka Naoki Kohno A New Late Miocene Odobenid (Mammalia: Carnivora) from Hokkaido, Japan Suggests Rapid Diversification of Basal Miocene Odobenids. |
topic_facet |
Medicine R Science Q |
description |
The modern walrus, Odobenus rosmarus, is specialized and only extant member of the family Odobenidae. They were much more diversified in the past, and at least 16 genera and 20 species of fossil walruses have been known. Although their diversity increased in the late Miocene and Pliocene (around 8-2 Million years ago), older records are poorly known. A new genus and species of archaic odobenid, Archaeodobenus akamatsui, gen. et sp. nov. from the late Miocene (ca. 10.0-9.5 Ma) top of the Ichibangawa Formation, Hokkaido, northern Japan, suggests rapid diversification of basal Miocene walruses. Archaeodobenus akamatsui is the contemporaneous Pseudotaria muramotoi from the same formation, but they are distinguishable from each other in size and shape of the occipital condyle, foramen magnum and mastoid process of the cranium, and other postcranial features. Based on our phylogenetic analysis, A. akamatsui might have split from P. muramotoi at the late Miocene in the western North Pacific. This rapid diversification of the archaic odobenids occurred with a combination of marine regression and transgression, which provided geological isolation among the common ancestors of extinct odobenids. |
format |
Article in Journal/Newspaper |
author |
Yoshihiro Tanaka Naoki Kohno |
author_facet |
Yoshihiro Tanaka Naoki Kohno |
author_sort |
Yoshihiro Tanaka |
title |
A New Late Miocene Odobenid (Mammalia: Carnivora) from Hokkaido, Japan Suggests Rapid Diversification of Basal Miocene Odobenids. |
title_short |
A New Late Miocene Odobenid (Mammalia: Carnivora) from Hokkaido, Japan Suggests Rapid Diversification of Basal Miocene Odobenids. |
title_full |
A New Late Miocene Odobenid (Mammalia: Carnivora) from Hokkaido, Japan Suggests Rapid Diversification of Basal Miocene Odobenids. |
title_fullStr |
A New Late Miocene Odobenid (Mammalia: Carnivora) from Hokkaido, Japan Suggests Rapid Diversification of Basal Miocene Odobenids. |
title_full_unstemmed |
A New Late Miocene Odobenid (Mammalia: Carnivora) from Hokkaido, Japan Suggests Rapid Diversification of Basal Miocene Odobenids. |
title_sort |
new late miocene odobenid (mammalia: carnivora) from hokkaido, japan suggests rapid diversification of basal miocene odobenids. |
publisher |
Public Library of Science (PLoS) |
publishDate |
2015 |
url |
https://doi.org/10.1371/journal.pone.0131856 https://doaj.org/article/b9d8c44c118a479dbcbfdd97a375ebb5 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Odobenus rosmarus walrus* |
genre_facet |
Odobenus rosmarus walrus* |
op_source |
PLoS ONE, Vol 10, Iss 8, p e0131856 (2015) |
op_relation |
http://europepmc.org/articles/PMC4526471?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0131856 https://doaj.org/article/b9d8c44c118a479dbcbfdd97a375ebb5 |
op_doi |
https://doi.org/10.1371/journal.pone.0131856 |
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PLOS ONE |
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10 |
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e0131856 |
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