Brienomyrus (Brienomyrus) batesii (Boulenger, 1906)
Species overview
Medium sized fish, moderately elongate; head truncate-snouted, snout blunt, rounded. Brown, slightly countershaded. Size observed: 134 mm SL.
B. batesii(measurements)
Taxonomic description
Moderately elongate, laterally compressed, body depth 16-23 % SL, greatest depth between pelvic and anal fin.
-Head length 22-24 % SL, head depth 17-18 % SL, 81-85 % body depth.
-Outline of back straight, upper profile of head straight, underside of head concave, outline of belly slightly convex.
-Snout rather blunt, 22-26 % head length, 31-36 % postorbital length; mouth small, subterminal, 17-20 % head length, its edge below anterior nostril, upper jaw on a level with upper edge base of pectoral fin.
-Chin with submental swelling, without appendage.
-Teeth notched, 5-7/6-7.
-Nostrils circular, midway between eye and tip of snout, anterior on level with centre of eye, posterior with lower rim of orbit, axis of nostrils cutting axis of head at an angle of about 40°.
-Eye small, 7-10 % head length, 9-15 % postorbital length.
-Dorsal fin 16-19 fin-rays, its base 16-19 % SL, anal fin 22-26 rays, base of A 18-22 % SL; origin of D behind origin of anal, end of dorsal before end A; Predorsal length 66-67 %, SL preanal length 61-64 % SL.
-Pectoral obtusely pointed, not reaching to base of pelvic. V is closer to P than to A.
-Caudal pointed, both scaled part and membrane, scaled lobe almost half as long as total fin. 61-73 scales in lateral line, (15)-16-(18) scales round caudal peduncle.
-Caudal peduncle 19-22 % SL, its depth 5-7 % SL, 25-37 % its length.
-Coloration Uniform brown, slightly countershaded.
Type locality
Kribi river at Efulen, South Cameroon.
Distribution
Kribi river, (02° 57 ‘ N 09° 35 ‘ E), South Cameroon (North Gabon), Sanaga river (03° 55 ‘ N 09° 38 ‘ E), Cameroon, Nyanga (03° 02 ‘ S 10° 15 ‘ E) and Ivindo rivers (00° 09 ‘ S 12° 09 ‘ E) , Gabon.
Electric organ discharges
B. batesii(elec. organ)
B. batesii(EOD)