Pterosperma cf. polygonum Ostenfeld in Ostenfeld & Schmidt 1902

The non-motile phase (=phycoma), surface of outer wall showing pores. (Arrow=row of pores) (DIC)


Life-form: Phycoma phase and solitary flagellate?

Size: Diameter=(18?)30-40 µm

Resting spore:

Note: The phycoma stage from Skagerrak was much smaller than reported from the litterature

Distinctive features: Alae in a pentagonal pattern and raws of pores in the outer wall of phycoma phase

Similar species: Pterosperma cristatum P. marginatum


Ostenfeld, C. H. & Schmidt, J. 1902. Plankton fra det Røde Hav og Adenbugten. Vidensk. Medd. Naturh. Foren. i Kbhvn. 1901: 141-182

Parke, M., Boalch, G. T., Jowett, R. & Harbour, D. S. 1978. The genus Pterosperma (Prasinophyceae): species with a single equatorial ala. J. Mar. Biol. Ass. U.K., 58: 239-276.

Throndsen, J. 1993. The planktonic marine flagellates. In: (Tomas eds.) Marine Phytoplankton: a guide to naked flagellates and coccolithophorids. Academic Press, San Diego, pp. 7-145.

  Copyright © 1996-2006, Mats Kuylenstierna & Bengt Karlson All rights reserved.
Last modified on 15 September, 2006

Swedish Meteorological and Hydrological Institute

Department of Marine Ecology, Göteborg University, Sweden