The land snail, Dyakia striata, bioluminesces to exhibit green light. Its luminescence spectrum was recently reported by using juvenile snails to show the maximum at ca. 515 nm. In the current studies, a green fluorescent substance was extracted from the separated anterior head-foot of the adult snails, which contained the photogenic organs. The fluorescent substance, which showed the maximum ca. 515nm in its spectrum, was purified by chromatography. The partially purified green fluorescent substance was soluble only in organic solvents and not in water. The chromophore of the green fluorescent substance was compared with isoalloxazine and riboflavin acetate in different organic solvents under reductive and re-oxidative conditions.

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