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  1. 115 理学系研究科・理学部
  2. 06 地球惑星科学専攻
  3. 1150610 学術雑誌論文
  1. 0 資料タイプ別
  2. 10 学術雑誌論文
  3. 014 自然科学

Sclerotic Rings in Mosasaurs (Squamata: Mosasauridae): Structures and Taxonomic Diversity

http://hdl.handle.net/2261/56496
http://hdl.handle.net/2261/56496
80f41708-b49f-4ca9-b9d1-46a109ae8f9d
名前 / ファイル ライセンス アクション
journal.pone.0117079.pdf journal.pone.0117079.pdf (3.2 MB)
Item type 学術雑誌論文 / Journal Article(1)
公開日 2015-02-26
タイトル
タイトル Sclerotic Rings in Mosasaurs (Squamata: Mosasauridae): Structures and Taxonomic Diversity
言語
言語 eng
資源タイプ
資源 http://purl.org/coar/resource_type/c_6501
タイプ journal article
著者 Yamashita, Momo

× Yamashita, Momo

WEKO 2394

Yamashita, Momo

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Konishi, Takuya

× Konishi, Takuya

WEKO 2395

Konishi, Takuya

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Sato, Tamaki

× Sato, Tamaki

WEKO 2396

Sato, Tamaki

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著者所属
著者所属 Department of Astronomy and Earth Sciences, Tokyo Gakugei University
著者所属
著者所属 Royal Tyrrell Museum of Palaeontology
抄録
内容記述タイプ Abstract
内容記述 Mosasaurs (Squamata: Mosasauridae) were a highly diverse, globally distributed group of aquatic lizards in the Late Cretaceous (98–66 million years ago) that exhibited a high degree of adaptation to life in water. To date, despite their rich fossil record, the anatomy of complete mosasaur sclerotic rings, embedded in the sclera of the eyeball, has not been thoroughly investigated. We here describe and compare sclerotic rings of four mosasaur genera, Tylosaurus, Platecarpus, Clidastes, and Mosasaurus, for the first time. Two specimens of Tylosaurus and Platecarpus share an exact scleral ossicle arrangement, excepting the missing portion in the specimen of Platecarpus. Furthermore, the exact arrangement and the total count of 14 ossicles per ring are shared between Tylosaurus and numerous living terrestrial lizard taxa, pertaining to both Iguania and Scleroglossa. In contrast, two species of Mosasaurus share the identical count of 12 ossicles and the arrangement with each other, while no living lizard taxa share exactly the same arrangement. Such a mosaic distribution of these traits both among squamates globally and among obligatorily aquatic mosasaurs specifically suggests that neither the ossicle count nor their arrangement played major roles in the aquatic adaptation in mosasaur eyes. All the mosasaur sclerotic rings examined consistently exhibit aperture eccentricity and the scleral ossicles with gently convex outer side. Hitherto unknown to any squamate taxa, one specimen of Platecarpus unexpectedly shows a raised, concentric band of roughened surface on the inner surface of the sclerotic ring. It is possible that one or both of these latter features may have related to adaptation towards aquatic vision in mosasaurs, but further quantitative study of extant reptilian clades containing both terrestrial and aquatic taxa is critical and necessary in order to understand possible adaptive significances of such osteological features.
内容記述
内容記述タイプ Other
内容記述 UTokyo Research掲載「化石から探る海生爬虫類モササウルス類の眼の進化と適応」 URI: http://www.u-tokyo.ac.jp/ja/utokyo-research/research-news/evolution-and-aquatic-adaptation-of-mosasaur-eye/
内容記述
内容記述タイプ Other
内容記述 UTokyo Research "Evolution and aquatic adaptation of mosasaur eye" URI: http://www.u-tokyo.ac.jp/en/utokyo-research/research-news/evolution-and-aquatic-adaptation-of-mosasaur-eye/
書誌情報 PLoS ONE

巻 10, 号 2, p. e0117079, 発行日 2015-02-18
ISSN
収録物識別子タイプ ISSN
収録物識別子 1932-6203
DOI
識別子タイプ DOI
関連識別子 info:doi/10.1371/journal.pone.0117079
権利
権利情報 Copyright: (C) 2015 Yamashita et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited
著者版フラグ
値 publisher
出版者
出版者 PLOS
出版者別名
Public Library of Science
関係URI
識別子タイプ URI
関連識別子 http://www.u-tokyo.ac.jp/ja/utokyo-research/research-news/evolution-and-aquatic-adaptation-of-mosasaur-eye/
関係URI
識別子タイプ URI
関連識別子 http://www.u-tokyo.ac.jp/en/utokyo-research/research-news/evolution-and-aquatic-adaptation-of-mosasaur-eye/
関係URI
識別子タイプ URI
関連識別子 http://dx.plos.org/10.1371/journal.pone.0117079
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