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
Distribution:
Literature:
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.