chromatophore

From Wiktionary
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Noun[change]

Singular
chromatophore

Plural
chromatophores

A zebrafish can change its coloring with cromatophores depending on whether it is in a dark (top) or light (bottom) environment.
  1. Cromatophores are cells that contain pigment and reflect light. They are found in amphibians, fish, reptiles, crustaceans, and cephalopods.