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Why did rudist bivalves flourish in the reefal environments in the Cretaceous Greenhouse Earth? -Early evolution of the Hippuritidae

Research Project

Project/Area Number 20K04145
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 17050:Biogeosciences-related
Research InstitutionUniversity of Toyama

Principal Investigator

SANO Shin-ichi  富山大学, 学術研究部都市デザイン学系, 教授 (50823259)

Co-Investigator(Kenkyū-buntansha) 伊庭 靖弘  北海道大学, 理学研究院, 准教授 (80610451)
Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2020: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords白亜紀 / 赤道太平洋域 / フィリピン / ヒップリテス科 / ポリコニテス科 / 厚歯二枚貝 / 系統分類 / 古生物地理 / 太平洋 / 分岐分類 / 礁性環境 / 形態学的革新
Outline of Research at the Start

温暖化が著しく進んだ後期白亜紀は、熱帯域に広大な厚歯二枚貝“礁”が発達し、地球史上で唯一、二枚貝が礁性環境の主役となった時代である。「どうして当時厚歯二枚貝が繁栄したのか」について、地球表層環境変動と関連させた議論はあるものの、厚歯二枚貝自体の「形態学的変革」に着目した研究はほとんどない。本研究では,厚歯二枚貝を代表するヒップリテス科と,その祖先形とされる科について,白亜紀中頃の全属の形態学的特徴を分析し、系統関係を明らかにすることにより、「ヒップリテス科は、どの地域で、どのタクサから、どのような形態学的変革を経て、派生したのか」を議論し、“温室地球”での二枚貝の繁栄の理由を探ることを目指す。

Outline of Final Research Achievements

The Hippuritidae is one of the representative rudist families in the Late Cretaceous, but its origin and early evolutionary history remain uncertain. A new hippuritid from the Caramoan Peninsula, the Philippines, has a distinct multiple-fold system having seven or eight radial infoldings, which are inserted into fixed places by fixed order, in the outer shell layer along the whole commissural margin of the right valve. It uniquely combines primitive and “derived” morphological features from different lineages of this family. Cladistic analysis of the almost all of the hippuritid genera and some advanced forms of the polyconitids, the candidate ancestors for the Hippuritidae, is conducted. The Caramoan hippuritid comprises the clade with Torreites and Polytorreites, which represents the systematic position derived from the polyconitids and sister to other hippuritids. It is supposed that the Hippuritidae most likely originated in the Central Pacific area in the Cenomanian.

Academic Significance and Societal Importance of the Research Achievements

後期白亜紀は,地球史上で唯一,二枚貝が礁性環境の主役になった時代である.ヒップリテス科は厚歯二枚貝を代表する存在で,蓋付き湯飲み型の形態を持ち,後期白亜紀の炭酸塩プラットフォームに繁栄し,この成功の理由を探る上で重要な存在である.本科は,後期白亜紀チューロニアンに,科の様々な標徴を既に獲得した状態で,地中海地域とカリブ海地域にほぼ同時に出現したとされ,その起源は謎とされてきた.本研究によって,本科がセノマニアンの赤道太平洋域に起源し,本科の標徴も,祖先形となるポリコニテス科から,従来想定されていない形態を原始的段階として,段階的に獲得されたという,全く新しい初期進化史を提案することができた.

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (21 results)

All 2024 2023 2022 2021 2020 Other

All Int'l Joint Research (4 results) Journal Article (3 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (13 results) (of which Int'l Joint Research: 5 results) Book (1 results)

  • [Int'l Joint Research] Open University(英国)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] University of Philippines(フィリピン)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] Open University(英国)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] Open University(英国)

    • Related Report
      2021 Research-status Report
  • [Journal Article] Taxonomy and paleobiogeographic implication of Glabrobournonia Morris and Skelton (Hippuritida, Radiolitidae) from the Late Cretaceous Yigeziya Formation, southwestern Tarim Basin2023

    • Author(s)
      Rao, Xin, Peter W. Skelton, Shin-ichi Sano, Bin Wan
    • Journal Title

      Palaeoworld

      Volume: 32 Issue: 1 Pages: 136-147

    • DOI

      10.1016/j.palwor.2022.05.003

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Multi‐approach characterization of shallow‐water carbonates off Minamitorishima and their depositional settings/history2021

    • Author(s)
      Aftabuzzaman Md.、Yomogida Kazuki、Suzuki Shota、Takayanagi Hideko、Ishigaki Akimasa、Machida Shiki、Asahara Yoshihiro、Yamamoto Koshi、Hirano Naoto、Sano Shin‐Ichi、Chiyonobu Shun、Bassi Davide、Iryu Yasufumi
    • Journal Title

      Island Arc

      Volume: 30 Issue: 1

    • DOI

      10.1111/iar.12400

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Visualization of the morphology and mode ofoccurrence of Cenomanian rudists within a drillcore by X-ray CT scanning and 3Dmodeling2020

    • Author(s)
      Yamanaka Motoyoshi、Sano Shin-ichi、Al Zaabi Hamad Bu Alrougha、Fujioka Hiroshi、Iryu Yasufumi
    • Journal Title

      Progress in Earth and Planetary Science

      Volume: 7 Issue: 1

    • DOI

      10.1186/s40645-020-00359-7

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] 愛媛県西予市三瓶町蔵貫に分布する鳥巣式石灰岩からエピディセラス科厚歯二枚貝密集層の発見2024

    • Author(s)
      佐野晋一・リノ ヴァランタン・平岡美侑・堀 利栄
    • Organizer
      日本古生物学会 第173回例会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 赤道太平洋域産ヒップリテス科厚歯二枚貝とその進化史上の意義2024

    • Author(s)
      伊藤綾花・佐野晋一・伊庭靖弘
    • Organizer
      日本古生物学会 第173回例会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 太平洋域の化石記録から見たルディスト(厚歯二枚貝)の系統分類と古生物地理の新展開2024

    • Author(s)
      佐野晋一
    • Organizer
      日本古生物学会2024年年会 シンポジウム
    • Related Report
      2023 Annual Research Report
  • [Presentation] An enigmatic new taxon from Central Pacific highlights mosaic evolution among the family Hippuritidae (Bivalvia)2023

    • Author(s)
      ITO, Ayaka, Shin-ichi SANO, Yasuhiro IBA, Yusuke TAKEDA, Peter W. SKELTON, Yolanda M. AGUILAR, Roberto S. P. de OCAMPO and Tomoki KASE
    • Organizer
      2nd Asian Palaeontological Congress
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Mid-Cretaceous rudists in the northern part of Myanmar and their paleobiogeographic significance2023

    • Author(s)
      SANO, Shin-ichi, Yasuhiro IBA, Aya KUBOTA, Tin Tin LATT, Saw Mu Tha Lay PAW and Thura OO
    • Organizer
      2nd Asian Palaeontological Congress
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 赤道太平洋域産ヒップリテス科厚歯二枚貝の左殻内部形態とその進化史上の意義2023

    • Author(s)
      伊藤綾花・佐野晋一・竹田裕介・伊庭靖弘
    • Organizer
      日本古生物学会第172回例会
    • Related Report
      2022 Research-status Report
  • [Presentation] A new hippuritid rudist bivalve from the Caramoan Peninsula, the Philippines, sheds new light on the evolutionary history of the Hippuritidae2022

    • Author(s)
      Ito, Ayaka, Shin-ichi Sano, Yasuhiro Iba, Peter W. Skelton, Yolanda M. Aguilar, Roberto S.P. De Ocampo, Tomoki Kase
    • Organizer
      World Congress of Malacology 2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] An enigmatic new taxon from the Philippines suggests that the rudist family Hippuritidae originated in the Pacific Realm2022

    • Author(s)
      Ito, Ayaka, Shin-ichi Sano, Yasuhiro Iba, Peter W. Skelton, Yolanda M. Aguilar, Roberto S.P. De Ocampo, Tomoki Kase
    • Organizer
      11th International Cretaceous Symposium
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] 赤道太平洋 域産ヒップリテス科厚歯二枚貝のオクラのような「折 りたたみ構造」の形成過程2022

    • Author(s)
      伊藤綾花・佐野晋一・伊庭靖弘
    • Organizer
      日本古生物学会第 171 回例会
    • Related Report
      2021 Research-status Report
  • [Presentation] 赤道太平洋域からの新たなヒップリテス科厚歯二枚貝とその起源2021

    • Author(s)
      伊藤綾花・佐野晋一・伊庭靖弘・P. W. Skelton・Y. M. Aguilar・R. De Ocampo・加瀬友喜
    • Organizer
      日本古生物学会 2021 年年会
    • Related Report
      2021 Research-status Report
  • [Presentation] 青森県尻屋地域産後期三畳紀メガロドン科二枚貝の分類再検討2021

    • Author(s)
      大林 瑛・島口 天・ 杉沢典孝・佐野晋一
    • Organizer
      日本古生物学会 2021 年年会
    • Related Report
      2021 Research-status Report
  • [Presentation] 砕屑性ジルコン年代分布からみる東北日本蝦夷堆積盆の後背地2020

    • Author(s)
      久保見 幸・佐野晋一・村上みなみ・大田敬豊・長田 充弘・山本鋼志・大藤 茂
    • Organizer
      JpGU-AGU Joint Meeting 2020: Virtual
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Shallow-water carbonates off Minamitorishima and their depositional settings/history2020

    • Author(s)
      Aftabuzzaman Md, K. Yomogida, S. Suzuki, H. Takayanagi, A. Ishigaki, S. Machida, Y. Asahara, K. Yamamoto, N. Hirano, S. Sano, S. Chiyonobu, D. Bassi and Y. Iryu
    • Organizer
      日本サンゴ礁学会第23回大会
    • Related Report
      2020 Research-status Report
  • [Book] 古生物学の百科事典2023

    • Author(s)
      日本古生物学会編
    • Total Pages
      790
    • Publisher
      丸善出版
    • ISBN
      9784621307588
    • Related Report
      2022 Research-status Report

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Published: 2020-04-28   Modified: 2025-01-30  

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