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Description of Monocosta fennicaCell solitary, planktonic. Protoplast (2.5-3.3 microns long) with an anteriorly inserted flagellum (9.2-11.7 microns long) surrounded by a ring of tentacles. Five costal strips forming a ring encircle the protoplast. Doubling of single costal strips may occur, giving a total of six or seven strips. Costal strip length varies between 2.9 and 3.3 microns.