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Description of Monosiga marinaSolitary cells, without lorica, with one collar and one flagellum. The body globular-claviform, 6-11 microns x 3.5-5.5 microns. The collar hyaline, greatly varying in shape; length 3.5-5.5 microns. Flagellum 3-4 times as long as the cell body. Generally with a basal stalk, the nucleus is globular, with a large nucleolus.