The ultrastructure of Pyramimonas pseudoparkeae sp. Non of member of the class Parasinophyceae occurring in tidal pools along the east, south and west coast of South Aftica, is described. The cell surface is covered by three distinctive body scales whilst the flagellar surfaces possess four tupes of scales. The structure of these scales is described. P. pseudoparkeae resembles Pyramimonas parkeae Norris and Pearson but differs in the structure of the type 2 body scale. The symmetry and utrastructure of the cell are described with special attentin given to the flagellar apparatus. Preliminay information on the life cycle of this species is presented. This new species is compared with other closely related members of the genus Pyramimonas. [ABSTRACT FROM AUTHOR]

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