Chromatophores

Chromatophores are pigment-containing and light-reflecting cells, or groups of cells, found in a wide range of animals including amphibians, fish, reptiles, crustaceans and cephalopods. Mammals and birds, in contrast, have a class of cells called melanocytes for coloration.

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Chromatophores in the skin of a squid. image: Minette /wikipedia

Chromatophores are largely responsible for generating skin and eye colour in ectothermic animals and are generated in the neural crest during embryonic development. 

Mature chromatophores are grouped into subclasses based on their colour (more properly "hue") under white light: 

  • xanthophores (yellow), 
  • erythrophores (red), 
  • iridophores (reflective / iridescent), 
  • leucophores (white), 
  • melanophores (black/brown), and 
  • cyanophores (blue).



Some species can rapidly change colour through mechanisms that translocate pigment and reorient reflective plates within chromatophores. This process, often used as a type of camouflage, is called physiological colour change or metachrosis. 

Cephalopods such as the octopus have complex chromatophore organs controlled by muscles to achieve this, whereas vertebrates such as chameleons generate a similar effect by cell signalling. Such signals can be hormones or neurotransmitters and may be initiated by changes in mood, temperature, stress or visible changes in the local environment. 

 Chromatophores are also studied by scientists to understand human disease and as a tool in drug discovery.


source adapted from: Wikipedia contributors. (2019, April 28). Chromatophore. In Wikipedia, The Free Encyclopedia. Retrieved 05:27, June 25, 2019, from https://en.wikipedia.org/w/index.php?title=Chromatophore&oldid=894462044