Comprehensive DescriptionRead full entry
Reizer (1964) recognized four subspecies of Mormyrus caballus, all within the Congo basin.
M. caballus caballus Boulenger in the Cuvette Centrale
M. caballus bumbanus Boulenger in the Bumba of S. Cameroon, but also Ubangi, Uélé, and Ituri basins
M. caballus lualabae Reizer in the upper Lualaba.
M. caballus asinus Boulenger from Lake Moero and the Luapula R.
Depth of body nearly equal to length of head, 3 3/5 to 5 times in total length. Upper profile of head descending in a curve; snout produced, as long as or a little shorter than postocular part of head, its length about twice its least depth; mouth very small, with thick lips; teeth notched, 5 or 7 in upper jaw, 8 or 10 in lower; eye moderate, its diameter 2 to 4 times in length of snout and 1¼ to 1½ times in interorbital width. Dorsal 60-70, originating above base of ventral or slightly anterior to it, 2| to 3 times as long as anal. Anal 22-26, originating at equal distance from head and base of caudal. Pectoral rounded, ½ to 3/5 length of head, not reaching or hardly reaching base of ventral; ventral about 2/5 length of head. Caudal densely scaled, with obtusely pointed lobes. Caudal peduncle 2 ½ to 3 times as long as deep, ½ to 2/3 length of head. 85-100 scales in lateral line, 22-30 / 22-30 in transverse series on body, 32-36 in transverse series between dorsal and anal, 12 or 14 round caudal peduncle. Bluish grey above, whitish below. Total length 500 millim.