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Species of volvocalean green algae spanning a large range in size. Shown are the single-cell C. reinhardtii (A), undifferentiated colonies Gonium pectorale (8 cells) (B) and Eudorina elegans (32 cells) (C), and those with germ-soma differentiation Pleodorina californica (64 cells) (D), V. carteri (≈1,000 cells) (E), and Volvox aureus (≈2,000 cells) (F).
