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Bioluminescence
Idiocanthus posses a luminous spherical organ that hangs off the lower jaw as a thin barbell. Along the both the dorsal and ventral sides of its body, the Idiocanthus has a single strip of chevron-shaped spots of luminescent tissue that, when stimulated, appears to glow either yellow or blue-green. Studies by William T. O'Day have shown that this tissue can be stimulated by injection of adrenaline into the muscle, topical application of adrenaline, and occasionally tactile touch. The duration of the emitted light has only been observed to be a few seconds long.