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A selection of the volvocalean green algae, arranged according to organism radius R (after [5]). In order of increasing size, they are unicellular C. reinhardtii, undifferentiated G. pectorale and Eudorina elegans, followed by the soma-differentiated Pleodorina californica and germ–soma differentiated V. carteri and V. barberi. When two cell types can be recognized, the smaller are the somatic cells, the larger are the germ cells or daughter colonies.
