open access

https://hdl.handle.net/2115/71571

Pyramidodinium spinulosum sp nov (Dinophyceae), a sand-dwelling non-motile dinoflagellate from the seafloor (36m deep) off Mageshima Island, Kagoshima, Japan

英語

ultrastructure

2017-10-01

John Wiley & Sons

Phycological research

65(4)

272-279

A new species of benthic marine dinoflagellate, Pyramidodinium spinulosumHoriguchi, Moriya, Pinto & Terada is described from the deep (36m) seafloor off Mageshima Island, Kagoshima Prefecture, Japan in the subtropical region of the northwest Pacific. The life cycle of the dinoflagellate consists of a dominant, attached, dome-shaped, vegetative form and short-lasting, motile cell. Asexual reproduction takes place by the formation of two motile cells within each non-motile cell. The released motile cells swim only for a short period and transform directly into the dome-shaped vegetative form. The duration of the cell cycle varies and can be extremely long, ranging 5-38days under culture conditions. The non-motile cell is enclosed by a cell wall and its surface is covered with many (80-130) spines of various length. The dinoflagellate is photosynthetic and contains many (more than 50) discoidal chloroplasts. Phylogenetic analysis reveals that the dinoflagellate is closely related to the type species of the genus Pyramidodinium, P. atrofuscum which also possesses a dominant, attached, non-motile form. However, P. spinulosum can be clearly distinguished from P. atrofuscum by the cell shape (dome-shaped vs. pyramid-shaped) and surface ornamentation (spines vs. wart-like processes) of the non-motile form. Based on these morphological differences together with molecular evidence, it was concluded that this organism from a deep water sand sample should be described as a second species of the genus Pyramidodinium, P. spinulosum.

学術雑誌論文

Accepted Manuscript

This is the peer reviewed version of the following article: Horiguchi, T., Moriya, R., Pinto, S. K. and Terada, R. (2017), Pyramidodinium spinulosum sp. nov. (Dinophyceae), a sand-dwelling non-motile dinoflagellate from the seafloor (36 m deep) off Mageshima Island, Kagoshima, Japan. Phycological Res., 65: 272–279, which has been published in final form at doi:10.1111/pre.12183. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.

1322-0829