[B-CG05] Diversity and ecology of marine protists -from past to present

[BCG05-P06] Case study on Radiolarian skeletogenesis and feeding style -A review of recent achievements

*Rie Hori, S.¹ (1.Department of Earth Science, Faculty of Science, Ehime University)

Keywords:Radiolaria, skeletogenesis , marine plankton

Radiolaria is one of the three big marine Protists and highly contributes to oceanic products since Paleozoic era. It originated in pre-Cambrian ocean to lives to recent Ocean, well-contained in sedimentary rocks because of siliceous skeletons, however, there are fewer research in biological view comparing with those in paleontological ones. Japanese radiolarian paleontologist group have started workshop of Living radiolarian study since 1990 ages (Okinawa research tour organized by Prof. Atsushi Matsuoka, which were operated in Sesoko Station of Ryukyu University), and then has been spread study networks on living Radiolaria in Japan. Pioneering research has been conducted by active young scientists, for example, Dr. K. Sugiyama, Dr. T. Yuasa, Dr. Y. Ishitani and Dr. Y. Nakamura etc. after Prof. A. Matsuoka. Teams of Living radiolarian study of Ehime University also have been continued to study living radiolarians obtained from sea surface of Kuroshio Current near the western Shikoku, Japan since 2000. We performed experimental studies on living radiolarian cells to clarify their skeletogenesis and feeding style. In this talk, some of the results about living Radiolaria will be introduced such as deference of skeletal growth pattern on Spumellaria between Japan and the other area (e.g., Hori et al. 2021 + recent results) and specific style of feeding among Nassellarian species.