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Description of Ceratium hirundinellaCells are 80-400 µm in length. They are strongly compressed dorsoventrally. The apical horn is long and narrow with a blunt tip. The antapical horns are straight with pointed, closed tips. The antacpical horns are normally slightly diverging from each other distally. A third antapical horn can be present. C. hirundinella can occur in short chains and is known to have a wide salinity tolerance.