Dibranchus tremendus

Dibranchus tremendus has its dorsal spine supported by between 4 and 7 soft rays and its anal fin by 4 soft rays. The tubercles in the skin do not have the radiating rows of spinules that those of D. atlanticus have. The spines of the tubercles are very long and robust, especially on the sides of the caudal peduncle. The lower surface of the disc shaped body is covered in tubercles. The main tubercles of the lower surface of the caudal peduncle are very large and take up the entire lower surface except for a few small tubercles in the middle part between the anus and the base of the anal fin. The overall colour is brown. This species is the largest species in the genus Dibranchus with a maximum published total length of 19.2 cm (7.6 in).

Dibranchus tremendus is found in the Atlantic Ocean. In the western Atlantic it is found in the Caribbean Sea and Gulf of Mexico, it has also been recorded from the Hydrographer Canyon, south of Hudson Canyon, from close to Block Canyon and the Bear Seamount. In the eastern Atlantic it has been recorded in Cape Verde and between the Gulf of Guinea and Namibia. This benthic fish is found at depths between 750 and 3,000 m (2,460 and 9,840 ft), typically in excess of 1,000 m (3,300 ft).

Dibranchus tremendus is classified in the genus Dibranchus, a name which prefixes di, meaning "two", on to branchus, meaning "gills", a reference to only the second and third gill arches having gills, the fourth having no gill filaments. The specific epithet tremendus, means "something to be trembled at", an allusion to the large size and spiny skin of this fish.