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Life stages and anatomical features of Euglena viridis, a classic example of a protist that shares characteristics of both plants and animals. a: Stigma (Eyespot). This is a pigmented organelle (usually reddish) that is sensitive to light. It helps the Euglena find the right light intensity for photosynthesis. b: Reservoir / Contractile Vacuole. This area is involved in osmoregulation (balancing water levels) and is where the flagellum originates. c: Nucleus. This is the "control center" containing the cell's genetic material. Note how its position stays relatively consistent as the cell changes shape.