Taxonomy and phylogeny of red tide forming unarmored dinoflagellates based on flagellar apparatus

2014 Fiscal Year Final Research Report

• Project/Area Number: 24580258
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: General fisheries
• Research Institution: The University of Tokyo (2014); Yamagata University (2012-2013)
• Principal Investigator: IWATAKI Mitsunori 東京大学, アジア生物資源環境研究センター, 准教授 (50423645)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 有害藻類 / 渦鞭毛藻 / 微細構造 / 系統分類 / 鞭毛装置構造

Outline of Final Research Achievements

Intracellular ultrastructure of marine red tide forming dinoflagellates, of which related species have not been revealed based on molecular phylogeny, were analyzed to determine their phylogenetic positions. Harmful dinoflagellate Cochlodinium polykrikoides has the long and striated ventral connective, which were found from Akashiwo sanguinea and Levanderina fissa; this characteristic structure implies affinity among these three species. Marine woloszynskioid dinoflagellates are assigned to the Suessiaceae, having the type E eyespot. A new species of the family, Biecheleria brevisulcata, was described with the ultrastructural features. Ultrastructure of a small marine dinoflagellate was observed and the type B eyespot was detected. This eyespot type has been reported from species of the Borghiellaceae, which distribute only in freshwater environment. This marine species was not related to the species of the Borghiellaceae in phylogenetic tree based on LSU rDNA sequences.

Free Research Field

藻類系統分類学