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Description of Monosiga brevicollisThe shape of the cells is variable. The resting cells are 4-6 microns long, more or less spherical. When swimming, the posterior end is sharpened, the shape becomes more ovoid and the collar is spread out. The collar is 0.5 cell length, the flagellum about 4.5 cell length. The cytoplasm is fine-grained to hyaline and contains strongly refractile grains. A vacuole lies in the posterior part of the cell.