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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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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Some EGSs in California are melanistic, a common trait in the northern portion of the native range (Thorington et al.
Although a rare sighting of the melanistic leopard, whose fur is black due to a pigment mutation, Kenya's Daily Nation newspaper reported that a similar leopard had been photographed back in 2013 and 2007.
Hermaphrodites also typically have dark melanistic mottling over the body and caudal fin.
According to the Odisha government, last census of tigers conducted by the use of both pugmark and camera trap techniques in the year 2016 showed presence of 28 tigers in Mayurbhanj's Similipal tiger reserve, which is famous for Black tigers and is the only place in the world that houses the source population of the melanistic tigers.
The black squirrel is not a separate species, but rather a melanistic form of the gray squirrel.
He has spotted almost 860 different species of animal and believes the one he saw in Tatenhill was a melanistic puma, which refers to the dark-coloured pigment of the animal's skin.
A Red foxes come in a variety of color phases: silver, cross, melanistic, and samson.
"The melanistic color variant of any big cat species" is how Wikipedia puts it.
According to the experts, black squirrels are a "melanistic" subgroup of the eastern grey squirrel and the fox squirrel.
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).
Karpestam E, Merilaita S, Forsman A (2012a) Reduced predation risk for melanistic pygmy grasshoppers in post-fire environments.