life stage: cyst
Cysts of Ceratium hirundinella are found in the water column during the exponential growth phase and sink to the sediments. Their shape is typical, with 3 horns and at least one red spot. The specimen was sampled from shallow water near the Kinneret Limnological Laboratory in April 2006. This image was taken by Alla Alster using an Olympus BX50 Microscope equipped with DIC optics. The copyright holders of this image are Alla Alster & Tamar Zohary and the image is used by micro*scope with agreement of the authors.
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From the collection
Lake Kinneret planktonic life forms
|Description of Ceratium hirundinella: Cells 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. |