Life cycle, behavior and morphology of a new tide pool dinoflagellate,Gymnodinium pyrenoidosum sp. nov. (Gymnodiniales, Pyrrhophyta)

  • Takeo Horiguchi
  • Mitsuo Chihara


A new tide pool dinoflagellate,Gymnodinium pyrenoidosum Horiguchi et Chihara sp. nov. is described from central Japan. It was found to form dense blooms with a characteristic greenish color from April to November. The species exhibits a characteristic diurnal vertical migration and an alternation of a motile with a nonmotile phase, which are dependent on light intensity and tidal movement.

Cells of the motile phase are unarmored and relatively small. They have a single, reticulate chloroplast, orange stigma situated near the sulcus and conspicuous pyrenoid in epicone. The alga reproduces itself by means of zoospores which are produced by the bipartition of protoplasm within the parent cell wall during the nonmotile stage which occurs at night. The occurrence of another type of motile cell, termed a macroswarmer, which differs from normal zoospore in size and shape has also been demonstrated.

Key words

Dinoflagellate Gymnodiniales Gymnodinium pyrenoidosum sp. nov. Life cycle Pyrrhophyta taxonomy Water bloom 


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Copyright information

© The Botanical Society of Japan 1988

Authors and Affiliations

  • Takeo Horiguchi
    • 1
  • Mitsuo Chihara
    • 1
  1. 1.Institute of Biological SciencesUniversity of TsukubaTsukuba-shi

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