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These protozoans form colonies. The large spherical colonies of Volvox globator are composed of several thousand cells around a hollow center.
Keywordsprotozoan, colonial protozoans, Volvox, Volvox globator
David Starr Jordan and Vernon Kellogg,Animal Life: A First Book of Zoology(New York:D. Appleton and Company, 1912) 29
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