Petrocephalus cunganus Boulenger, 1910
Species overview
Small fish, body moderately elongate and deep, head longer than deep, about as long as body depth, snout shorter than diameter of eye, mouth inferior. Head without aggregations, »rosettes«, of cutaneous sensory organs. Origin of dorsal fin above origin of anal. Silvery with brownish back, countershaded. Only known from the holotype.
Size observed: 101.5 mm SL.
P. cunganus(measurements)
Taxonomic description
-Body moderately elongate, strongly laterally compressed but moderately deep, body depth 20.2 % SL, greatest depth at origin of unpaired fins.
-Head length 27.6 % SL; head depth 22 % SL, 77 % body depth.
-Outline of back more or less straight, outline of belly slightly convex, upper profile and underside of head convex, bases of unpaired fins running moderately steep to caudal peduncle.
-Snout rounded, short, 18 % head length, 33 % postorbital length, upper jaw on a level with lower edge of opercular cleft.
-Mouth width 20 % head length, inferior, its edge below centre of eye.
-Chin inconspicuous.
-Teeth notched, 11/24.
-Nostrils further apart from each other than typical for Petrocephalus, posterior nostril slightly oval, both on a level between lower rim of lens and rim of eye; axis parallel axis of head.
-Eye diameter 21 % head length, 40 % postorbital length. No conspicuous aggregations of electrorecpetors on the head.
-Opercular cleft strongly curved, its posterior margin overlapping base of dorsal fin, 36 % head length, 46 % head depth.
-Dorsal fin 27 fin-rays, base of D 22 % SL, anal fin 32 rays, base of A 26 % SL, origin of D more or less opposite origin of A, end of D well before end of A; predorsal length 59 % SL, preanal length 57 % SL.
-Pectoral fin pointed, extending to 1/3 the length of pelvic fin. V is closer to P than to A.
-Caudal fin pointed, scaled part short. 47 scales in lateral line; 12 round caudal peduncle.
-Caudal peduncle 20 % SL, its depth 6 % SL, 33 % its length.
-Coloration »Brown above, silvery beneath; fins brownish«, countershaded; first rays of dorsal fin and base of caudal fin darker.
Type locality
»Quanza River at Cunga« Angola. Quanza river = Cuanza river (9° 19 ‘ S 13° 09 ‘ E)
Distribution
Angola, type locality.