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1. See melanosis.
2. Dark coloration of the skin, hair, fur, or feathers because of a high concentration of melanin.

mel′a·nis′tic adj.
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The induction and recovery times were determined at five stages of melanistic and not melanistic clownfish (Amphiprion ocellaris) and different sexes of Swordfish (Xiphophorus helleri).
Eastern gray squirrels (Sciurus carolinensis) are found in two main color morphs: a gray morph and a darker melanistic morph (Koprowski, 1994).
Melanistic individuals exhibit dark or even black pelage or appendages resulting from the excessive deposition of melanin, and this condition occurs less frequently than does albinism (Sage 1963).
Karpestam E, Merilaita S, Forsman A (2012a) Reduced predation risk for melanistic pygmy grasshoppers in post-fire environments.
The "black leopard" is a rare melanistic color phase (opposite albinism) that can occur anywhere, but in Africa it's perhaps most common in Ethiopia.
Similar to a previous study of melanistic leopards Panthera pardus (Hedges et al.
The presence of melanistic hamsters was positively associated with high temperatures and high levels of precipitation.
Albino and melanistic genets (Genetta genetta) in Europe.
Larval lengths refer to BL of ethanol-preserved larvae, and descriptions of pigmentation refer to melanistic pigment.
After studying several of these species, he determined that southern specimens often exhibited a melanistic variation (with intermediates) of the color form fairly consistently, and therefore determined that these are not varieties or subspecies but simply melanistic forms of the corresponding northern species.
Head of the environmental department of the British Sovereign Bases, Pantelis Charilaou, said: "A melanistic individual is a very, very rare sighting.