Three-dimensional visualization of Cretaceous angiosperms mesofossils using synchrotron radiation X-ray tomographic microscopy (SRXTM)
| Project/Area Number |
16K07477
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Biodiversity/Systematics
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| Research Institution | Niigata University |
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Principal Investigator |
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| Project Period (FY) |
2016-04-01 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
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| Keywords | 被子植物 / 初期進化 / 小型化石 / 大型シンクロトロン / 白亜紀 / 花化石 / 上北迫植物化石群 / 久慈層群 / モンゴル / Archaestella / 双葉層群 / シンクロトロン |
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| Outline of Final Research Achievements |
A new fossil taxon is described from the the Futaba Group in eastern Japan. These charcoalified mesofossils exhibit well-preserved three-dimensional structure and were analyzed using synchrotron-radiation X-ray microtomography to document their composition and internal structure.
Archaestella verticillatus gen. et sp. nov. is represented by flowers that are small, actinomorphic, pedicellate, bisexual, semi-inferior, and multicarpellate. The floral receptacle is cup shaped with a perigynous perianth. The gynoecium consists of a whorl of ten conduplicate carpels, including a central cavity. The styles are short, becoming recurved with a ventrally decurrent stigma. The morphological features of Archaestella indicate a possible relationship to Trochodendraceae in the basal grade of eudicots. The fossil currently provides the earliest record of the family and documents the presence of Trochodendraceae in eastern Eurasia during the middle part of the Late Cretaceous.
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| Academic Significance and Societal Importance of the Research Achievements |
被子植物の最古の花粉化石は、前期白亜紀のバレミアン期から発見されており、アプチアン期に、原始的被子植物の葉や花化石が発見されている。このことから、被子植物の初期進化群は前期白亜紀に開始し、後期白亜紀にかけて多様化していったと考えられている。
今回の研究で上北迫植物化石群から発見された白亜紀のヤマグルマ科の花化石は、被子植物の初期進化を解明するために非常に重要な成果である。これまでも、福島県の上北迫植物化石群から、バンレイシ科、シクンシ科やディディメレス科などの被子植物の花化石が多く発見してきた。このことは、この地域の後期白亜紀の気候は、熱帯・亜熱帯性地域であったことを示唆している。
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Report
(5 results)
Research Products
(26 results)
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[Journal Article] A new assemblage of plant mesofossils (late Coniacian; early Santonian; Upper Cretaceous) from the Tamagawa Formation, Kuji Group, in northeastern Japan2020
Author(s)
Takahashi, M., Herendeen, P. S., Herrera F., Hirayama, R., Ando, H., Sasaki, K., and Crane,
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Journal Title
Paleontological Research
Volume: 23
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Leaves of Podozamites and Pseudotorellia from the Early Cretaceous of Mongolia: stomatal patterns and implications for relationships.2018
Author(s)
Shi, G., Herrera, F., Herendeen, P.S., Leslie, A.B., Ichinnorov, N., Takahashi.M, and Crane, P.R.
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Journal Title
Journal of Systematic Palaeontology
Volume: 16
Issue: 3
Pages: 111-137
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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