マイクロ CT で取得した 3 次元形状情報に基づく有孔虫骨格モデルのパラメー タ同定

• Published in: 化石 Vol. 99; pp. 53 - 64
• Main Authors: 岸本, 直子, 木元, 克典
• Format: Journal Article
• Language: Japanese
• Published: 日本古生物学会 31.03.2016
• ISSN: 0022-9202; 2424-2632
• DOI: 10.14825/kaseki.99.0_53

Morphological variations in microfossils like foraminifers and radiolarians might have the meaning of various functions for their evolution and adaptation in the geological history. In order to quantitatively understand such morphological variations, it is important to parameterize the morphological features in microfossils. We obtained precise morphology of a modern planktic foraminifera Globigerinoides ruber (d’Orbigny) using Micro-Xray Computed Tomography (Micro-XCT) technique, and built numerical approximate models to validate the parameterization by experimental rules used the sequentially connected spheres. Our approximate spherical model clarified that several parameters including radius ratio, distances of geometric centers in each chambers are almost constant, and others such as revolving angle between adjacent chambers are gradually transformed associated with growth of G. ruber, and indicated previous numerical model could not interpret whole morphology of this species. The coupling of mathematical model and Micro-XCT technique has the great potential to realize various forms of microfossils and understand its functional morphology.