The dermal light sense.
D000222:Adaptation, Physiological; D000663:Amphibians; D000818:Animals; D000845:Annelida; D001181:Arthropods; D002013:Bryozoa; D002856:Chromatophores / Q000502:physiology; D003063:Cnidaria; D003593:Cytoplasm; D003624:Darkness; D004447:Echinodermata; D005399:Fishes; D008027:Light; D008124:Locomotion; D008974:Mollusca; D009068:Movement; D010465:Perception; D010870:Pineal Gland / Q000502:physiology; D011930:Reaction Time; D012018:Reflex; D011984:Sensory Receptor Cells; D012867:Skin / Q000294:innervation; D012879:Skin Physiological Phenomena; D014419:Turbellaria