Wikipedia
The black ruff (Centrolophus niger) is a medusafish, the only member of the genus Centrolophus. It is a mesopelagic fish found in all tropical and temperate oceans at depths of 50 to 1,000 m. Its length is typically up to 60 cm, but it may reach 150 cm. Other common names include rudderfish and blackfish.
Usage examples of "black ruff".
The head was less anthropoid: a black ruff on top, slit-pupiled green eyes, round mobile ears, flat nose that looked feline even to the cilia around it, full-lipped mouth with protruding tushes at the corners, and jaw that tapered down to aV.
His beard flared into a black ruff as blood sprayed from the gash at his hairline.
He was looking up at her, and as she stared in horror, the great black ruff of his mane came erect in excitation, so that he seemed to swell in size to fill the whole field of vision.