Researcher Information



Exploring the diversity and evolution of protists

Department of Biological Sciences, Biodiversity


Studies on systematics of algae and protists with sepcial reference to dinoflagellates. Studies on chloroplast evolution in dinoflagellates.

FieldPhycology, Protistology, Taxonomy, Molecular phylogenetics, Ultrastructure
KeywordDinoflagellates, Microalgae, Taxonomy, Protists, Ultrastructure, Molecular phylogeny, Endosymbiosis, Chloroplst evolution

Introduction of Research

The aim of our research is to understand biodiversity and evolution of micro-algae, especiall the dinoflagellates, although we also work on other groups of flagellates, such as raphidophytes. Our research project include
(1) Taxonomy and phylogeny of benthic marine dinoflagellates.
(2) Taxonomy and phylogeny of tidal pool dinoflagellates.
(3) Taxonomy and phylogeny of freshwater dinoflagellates.
(4) Taxonomy and phylogeny of marine parasitic dinoflagellates, including enigmatic Haplozoon spp.
(5) Diversity and evolution of dinoflagellates with a diatom endosymbiont (dinotoms).
(6) Diversity and evolution of dinoflagellates with kleptochloroplasts.

Scanning electron graphs of benthic dinoflagellate, Peridinium quinquecorne (= Blixaea quinquecornis). This dinoflagellate is known as a dinotom - a dinoflagellate with a diatom endosymbiont. Left: ventral view, Right: dorsal view.
Benthic marine dinoflagellate Bispinodinium angelaceum collected from sea floor at 36 m deep. Left: light microscopy, Right: fluorescent microscopy showing chlorophyll autofluorescnce.

Representative Achievements

Marine benthic dinoflagellates - unveiling their worldwide biodiversity. Mona Hoppenrath, Shauna A. Murray, Nicolas Chomérat and Takeo Horiguchi,Kleine Senckenberg-Reihe 5X, 274pp. Stuttgart. (2014) Book
Identification of highly-divergent diatom-derived chloroplasts in dinoflagellates, including a description of Durinskia kwazulunatalensis sp. nov. (Peridiniales, Dinophyceae). Norico Yamada, Stuart D. Sym and Takeo Horiguchi, Molecular Biology and Evolution.
Kleptochloroplast enlargement, karyoklepty and the distribtuion of the cryptomonad nucleus in Nusuttodinium (=Gymnodinium) aeruginosum (Dinophyceae). Ryo Onuma and Takeo Horiguchi, Protist 166: 177-195. (2015)
Bysmatrum austrafrum sp. nov. (Dinophyceae) a novel tidal pool dinoflagellate from South Africa. Mahmutjan Dawut, Stuart D. Sym, Shoichiro Suda and Takeo Horiguchi, Phycologia 57(2): 169-178. (2018)
Capter 16. Diversity and phylogeny of marine parasitic dinoflagelaltes. Takeo Horiguchi, In Susumu Ohtsuka, Toshinobu Suzaki, Takeo Horiguchi, Noritoshi Suzuki and Fabrice Not: Marine Protists - Diversity and Dynamics. Springer Japan, Tokyo. 397-419. (2015) Book chapter
Academic degreeDoctor of Science
Academic background1979 Graduated, Tsukuba University
1984 Graduated, Graduate School of Biological Sciences, Tsukuba University
1984-85 JSPS Post-doctoral fellow
1985-1987 Univ. Natal, South Africa, Postdoctoral Associate
1987-1988 Univ. Witwaterssrand, South Africa, Postdoctoral Associate
1988-1993 Shinshu University
1993- present Hokkaido University
Affiliated academic societyJapanese Socieety of Phycology, International Phycological Society, Phycological Society of America
Room addressFaculty of Science, Building #5 5-609