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ABSTRACT
A survey of Elysia timida populations was conducted on the Israeli coast of the Mediterranean, and the photoreactive behavior of this chloroplast-hosting slug was studied in loco. The photoreactive behavior of E. timida in the sea, was found to be similar to that measured in the laboratory. The parapodia open in optimal light of about 3 × 103–2 × 104 lx, and they close at lower and higher light intensities. The evolutionary aspects of this photoreactive behavior, as affected by the symbiotic chloroplasts, are discussed.