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Turonian collignoniceratid ammonites from Hokkaido, Japan : Stratigraphy and Paleontology of the Cretaceous in the Ishikari province, central Hokkaido, Part 3 (Department of general Studies)
https://kgwu.repo.nii.ac.jp/records/496
https://kgwu.repo.nii.ac.jp/records/49632ec54a3-e30c-421f-b298-2d11973854c0
| 名前 / ファイル | ライセンス | アクション |
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研究紀要1 14-1 二上 (1.4 MB)
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研究紀要1 14-2 plate 二上 (3.0 MB)
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| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
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| 公開日 | 2017-07-18 | |||||
| タイトル | ||||||
| タイトル | Turonian collignoniceratid ammonites from Hokkaido, Japan : Stratigraphy and Paleontology of the Cretaceous in the Ishikari province, central Hokkaido, Part 3 (Department of general Studies) | |||||
| タイトル | ||||||
| タイトル | Turonian collignoniceratid ammonites from Hokkaido, Japan : Stratigraphy and Paleontology of the Cretaceous in the Ishikari province, central Hokkaido, Part 3 (Department of general Studies) | |||||
| 言語 | en | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | departmental bulletin paper | |||||
| 著者 |
二上, 政夫
× 二上, 政夫× FUTAKAMI, Masao |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | In this paper five species belonging to the two genera of the Turonian collignoniceratid ammonites from Hokkaido are described, viz. Collignoniceras woollgari (Mantell), C. bravaisianum (d'Orbigny), Subprionocyclus neptuni (Geinitz), S. minimus (Hayasaka et Fukada) and S. (?) sp. Subprionocyclus bravaisianus is reasonably referred to the genus Collignoniceras and independent of S, neptuni. "Reesidrtes minimus" and "Subprionocyclus normalis" cannot be maintained as separate species. Furthermore, the relation between the Japanese "R. minimus" and "S. normalis" and the North American "S. normalis" [=Oregoniceras condoni, O. jacksonense and O. argonautarum] is examined, with a suggestion that they may represent geographical subspecies. A dimorphism represented by macroconchs and microconchs probably existed in the Turonian collignoniceratids. An evolutional change of the Turonian collignoniceratids as shown by a series of C. woollgari, S, neptuni and S. minimus shows a paedomorphosis, and probably is a case of the neoteny. This change is interpreted as an evolutional adaptation for the decrease in the resistance of water. In other words, the phylogenetic evolution of these Turonian collignoniceratids seems to suggest a trend of shell adaptation for more successful swimmer. | |||||
| 内容記述 | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | In this paper five species belonging to the two genera of the Turonian collignoniceratid ammonites from Hokkaido are described, viz. Collignoniceras woollgari (Mantell), C. bravaisianum (d'Orbigny), Subprionocyclus neptuni (Geinitz), S. minimus (Hayasaka et Fukada) and S. (?) sp. Subprionocyclus bravaisianus is reasonably referred to the genus Collignoniceras and independent of S, neptuni. "Reesidrtes minimus" and "Subprionocyclus normalis" cannot be maintained as separate species. Furthermore, the relation between the Japanese "R. minimus" and "S. normalis" and the North American "S. normalis" [=Oregoniceras condoni, O. jacksonense and O. argonautarum] is examined, with a suggestion that they may represent geographical subspecies. A dimorphism represented by macroconchs and microconchs probably existed in the Turonian collignoniceratids. An evolutional change of the Turonian collignoniceratids as shown by a series of C. woollgari, S, neptuni and S. minimus shows a paedomorphosis, and probably is a case of the neoteny. This change is interpreted as an evolutional adaptation for the decrease in the resistance of water. In other words, the phylogenetic evolution of these Turonian collignoniceratids seems to suggest a trend of shell adaptation for more successful swimmer. | |||||
| 書誌情報 |
川村学園女子大学研究紀要 en : The journal of Kawamura Gakuen Woman's University 巻 1, p. 235-260, 発行日 1990-03-15 |
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| 出版者 | ||||||
| 出版者 | 川村学園女子大学 | |||||
| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 09186050 | |||||
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| 収録物識別子タイプ | NCID | |||||
| 収録物識別子 | AN10179111 | |||||
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| 識別子タイプ | NAID | |||||
| 関連識別子 | 110000473122 | |||||
