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Abstract
Recent concepts concerning photoresponse mechanisms in green and colorless euglenoid flagellates are presented. Major topics include (1) the relationship between photobehavior and intracellular structure; (2) hypotheses concerning the nature of the photoreceptor pigments; (3) the relationship between the step‐up and step‐down photophobic responses, including the lability of the light‐intensity threshold for the step‐up response and the hypothetical mechanism of that phenomenon; (4) the hypotheses concerning the mechanisms of light‐oriented movement of euglenoid cells; (5) the role of the photophobic responses and oriented movement in the life of the cell; and (6) recent hypotheses on the evolution of structures and mechanisms involved in photoreception and photosensory transduction in the euglenoid flagellates.