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Description of Kentrosiga echinaCells are solitary or in linear colonies of 2 5 individuals. Cells 2.5-7.5 x 4.5-9.5 microns, flagellum 24-32 microns, surrounded by a short collar of tentacles (~7 microns). About 6-10 bristles(rather rigid cytoplasmic extentions) project from the cell surface. The protoplast is enclosed within a fine, flask-shaped investment which extends a short way above the cell.