Geologically Old and Ontogenetically Young Herpetocetus sp. from the Late Miocene of Hokkaido, Japan
An ontogenetically young fossil baleen whale from the lower part of the Horokaoshirarika Formation of Hokkaido, Japan, includes a partial skull, periotics, bullae, mandible, vertebrae, and a scapula. It is identified as Herpetocetus sp. because it exhibits a postglenoid process of the squamosal more...
Published in: | Journal of Vertebrate Paleontology |
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2019
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Online Access: | https://doi.org/10.1080/02724634.2018.1478842 |
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ftbioone:10.1080/02724634.2018.1478842 2024-06-02T08:04:01+00:00 Geologically Old and Ontogenetically Young Herpetocetus sp. from the Late Miocene of Hokkaido, Japan Yoshihiro Tanaka Mahito Watanabe Yoshihiro Tanaka Mahito Watanabe world 2019-04-03 text/HTML https://doi.org/10.1080/02724634.2018.1478842 en eng The Society of Vertebrate Paleontology doi:10.1080/02724634.2018.1478842 All rights reserved. https://doi.org/10.1080/02724634.2018.1478842 Text 2019 ftbioone https://doi.org/10.1080/02724634.2018.1478842 2024-05-07T00:51:19Z An ontogenetically young fossil baleen whale from the lower part of the Horokaoshirarika Formation of Hokkaido, Japan, includes a partial skull, periotics, bullae, mandible, vertebrae, and a scapula. It is identified as Herpetocetus sp. because it exhibits a postglenoid process of the squamosal more transversely compressed than in Nannocetus, a deep and anteroposteriorly long fossa on the dorsal surface of the squamosal between the zygomatic process and the lateral wall of the brain case, and a prominent squamosal flange of the periotic. The Hokkaido specimen differs from currently described Herpetocetus species in having a large hiatus fallopii, and an angle at the anteromedial edge of the pars cochlearis, just medial to the hiatus fallopii. Because the lower part of the Horokaoshirarika Formation is late Miocene in age (approximately 7.7 to 6.8Ma), the Hokkaido Herpetocetus specimen is the only record of Miocene Herpetocetinae from the western Pacific. Previously, Miocene Herpetocetinae were reported from the eastern North Pacific and western Atlantic. Accordingly, this new record of Herpetocetus from the upper Miocene of the western North Pacific suggests an earlier origin for both the genus and the subfamily. Text baleen whale BioOne Online Journals Fossa ENVELOPE(9.795,9.795,62.990,62.990) Pacific Journal of Vertebrate Paleontology 38 4 (1) (11) |
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BioOne Online Journals |
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ftbioone |
language |
English |
description |
An ontogenetically young fossil baleen whale from the lower part of the Horokaoshirarika Formation of Hokkaido, Japan, includes a partial skull, periotics, bullae, mandible, vertebrae, and a scapula. It is identified as Herpetocetus sp. because it exhibits a postglenoid process of the squamosal more transversely compressed than in Nannocetus, a deep and anteroposteriorly long fossa on the dorsal surface of the squamosal between the zygomatic process and the lateral wall of the brain case, and a prominent squamosal flange of the periotic. The Hokkaido specimen differs from currently described Herpetocetus species in having a large hiatus fallopii, and an angle at the anteromedial edge of the pars cochlearis, just medial to the hiatus fallopii. Because the lower part of the Horokaoshirarika Formation is late Miocene in age (approximately 7.7 to 6.8Ma), the Hokkaido Herpetocetus specimen is the only record of Miocene Herpetocetinae from the western Pacific. Previously, Miocene Herpetocetinae were reported from the eastern North Pacific and western Atlantic. Accordingly, this new record of Herpetocetus from the upper Miocene of the western North Pacific suggests an earlier origin for both the genus and the subfamily. |
author2 |
Yoshihiro Tanaka Mahito Watanabe |
format |
Text |
author |
Yoshihiro Tanaka Mahito Watanabe |
spellingShingle |
Yoshihiro Tanaka Mahito Watanabe Geologically Old and Ontogenetically Young Herpetocetus sp. from the Late Miocene of Hokkaido, Japan |
author_facet |
Yoshihiro Tanaka Mahito Watanabe |
author_sort |
Yoshihiro Tanaka |
title |
Geologically Old and Ontogenetically Young Herpetocetus sp. from the Late Miocene of Hokkaido, Japan |
title_short |
Geologically Old and Ontogenetically Young Herpetocetus sp. from the Late Miocene of Hokkaido, Japan |
title_full |
Geologically Old and Ontogenetically Young Herpetocetus sp. from the Late Miocene of Hokkaido, Japan |
title_fullStr |
Geologically Old and Ontogenetically Young Herpetocetus sp. from the Late Miocene of Hokkaido, Japan |
title_full_unstemmed |
Geologically Old and Ontogenetically Young Herpetocetus sp. from the Late Miocene of Hokkaido, Japan |
title_sort |
geologically old and ontogenetically young herpetocetus sp. from the late miocene of hokkaido, japan |
publisher |
The Society of Vertebrate Paleontology |
publishDate |
2019 |
url |
https://doi.org/10.1080/02724634.2018.1478842 |
op_coverage |
world |
long_lat |
ENVELOPE(9.795,9.795,62.990,62.990) |
geographic |
Fossa Pacific |
geographic_facet |
Fossa Pacific |
genre |
baleen whale |
genre_facet |
baleen whale |
op_source |
https://doi.org/10.1080/02724634.2018.1478842 |
op_relation |
doi:10.1080/02724634.2018.1478842 |
op_rights |
All rights reserved. |
op_doi |
https://doi.org/10.1080/02724634.2018.1478842 |
container_title |
Journal of Vertebrate Paleontology |
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38 |
container_issue |
4 |
container_start_page |
(1) |
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(11) |
_version_ |
1800748638882758656 |