melanophore

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A brown or black melanin-containing chromatophore found in the skin of a fish, amphibian, or reptile.

from The Century Dictionary.

• noun A large cell which contains dark pigment-granules. Typical examples occur in the common fence-lizard, Anolis, which turns from green to brown.
• noun The dark-brown chromatophore of the algæ.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun biology A cell containing melanin or other black pigment, such as are found in fish, amphibians, and reptiles