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The Cryptomonadaceae also are unicellular, and live free or in colonies.
The thallus may be unicellular or multicellular.
Some unicellular organisms are said to segregate salts of strontium from sea-water.
Nor is motility by means of cilia known in the group. In the unicellular forms, cell-division involves multiplication of the plant.
De Blainville included in his group many unicellular forms such as Noctiluca (see PROTOZOA), sea-anemones, corals, jelly-fish and hydroid polyps, echinoderms, polyzoa and rotifera.