A photophore is a glandular organ that appears as luminous spots on various marine animals, including fish and cephalopods. The organ can be simple, or as complex as the human eye; equipped with lenses, shutters, color filters and reflectors. The bioluminescence can variously be produced from compounds during the digestion of prey, from specialized mitochondrial cells in the organism, called photocytes ("light producing" cells), or, similarly, associated with symbiotic bacteria in the organism that is cultured.
Arrangement of various photophores on the squid Lycoteuthis lorigera
Photophores on a lanternfish, the most common deep sea fish worldwide
- "Cephalopod Photophore Terminology". Tolweb.org. Retrieved 2012-08-30.