| Project/Area Number |
22840052
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Single-year Grants |
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| Research Field |
Stratigraphy/Paleontology
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| Research Institution | The Institute of Physical and Chemical Research |
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Principal Investigator |
HIRASAWA Tatsuya 独立行政法人理化学研究所, 形態進化研究グループ, 基礎科学特別研究員 (60585793)
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| Project Period (FY) |
2010 – 2011
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| Project Status |
Completed (Fiscal Year 2011)
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| Budget Amount *help |
¥2,886,000 (Direct Cost: ¥2,220,000、Indirect Cost: ¥666,000)
Fiscal Year 2011: ¥1,469,000 (Direct Cost: ¥1,130,000、Indirect Cost: ¥339,000)
Fiscal Year 2010: ¥1,417,000 (Direct Cost: ¥1,090,000、Indirect Cost: ¥327,000)
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| Keywords | 主竜類 / 鳥類 / ワニ / 恐竜 / 化石 / 胸郭 / 古脊椎動物学 / 発生生物学 / 進化 / 発生学 |
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| Research Abstract |
I studied the ribcage development in the extant archosaurs(alligator and chicken), to understand the homologies between the avian-specific ribcage and the ancestral ribcage. In the alligator embryo, the three-segmented rib pattern develops in concordance with the positions of nerves and muscles, suggesting that the difference between this three-segmented and the avian two-segmented patterns is not due to the difference in ossification levels. Analyses on fossils of the Mesozoic theropods demonstrated that the acquisition of the avian two-segmented rib pattern was essential to the respiratory evolution in the lineage toward birds.
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