Pollimyrus tumifrons (Boulenger, 1902)
Species overview
Small fish, body moderately short and deep, head shorter than body depth, slightly longer than deep, snout rounded, clearly protruding mouth which is clearly inferior; dorsal fin slightly longer than anal; caudal peduncle short, slender. Uniform brown or silvery, densely dotted black. Size observed: 121 mm SL 139 mm TL.
P. tumifrons(measurements)
Taxonomic description
-Body moderately short, laterally compressed, moderately deep, body depth 27-35 % SL, greatest depth above pelvic fin.
-Head length 25-28 % SL; head depth 22-27 % SL, 74-86 % body depth.
-Outlines of back and belly slightly convex, upper profile of head strongly convex, underside of head concave, Bases of unpaired fins moderately steep running to caudal peduncle.
-Snout round, short, the tip slightly below centre of eye, 17-25 % head length, 30-42 % postorbital length, upper jaw on a level between base of pectoral fin and underside of head.
-Mouth 14-23 % head length, inferior, its edge below centre of eye.
-Chin inconspicuous.
-Teeth notched, 9-10/10-15.
-Nostrils separate, circular, both slightly below centre of eye, their axis running parallel to axis of head.
-Eye diameter 15-24 % head length, 23-44 % postorbital length.
-Opercular cleft curved, 26-39 % head length, 27-42 % head depth.
-Dorsal fin 25-29 fin-rays, base of D 25-31 % SL, anal fin 25-28 rays, base of A 24-27 % SL, origin of D more or less opposite origin of A, end of D behind end of A; predorsal length 51-58 % SL, preanal length 54-59 % SL.
-Pectoral fin pointed, extending nearly to end of pelvic fin. V is closer to P than to A.
-Caudal fin pointed, the scaled lobes obtusely pointed, nearly half as long as membranous portion. 60-68 scales in lateral line; 16 round caudal peduncle.
-Caudal peduncle 16-20 % SL, its depth 4-6 % SL, 21-32 % its length.
-Coloration »Uniform brown«; »Uniform brown, a little more yellowish on the belly; fins also uniform brown«; »Silvery, densely dotted black on head, back and belly«.
Type locality
P. tumifrons: »Banzyville«. Banzyville recently Mobayi-Mbongo (4° 18 ‘ N 21° 11 ‘ E) Haut-Zaïre, district of Democratic Republic of Congo.
P. anterodorsalis: »Panga«. (1° 51 ‘ N 26° 25 ‘ E) Zaïre-Équateur, district of Democratic Republic of Congo.
M. aequipinnis: »N’ Gombe (Kasaï)«. Zaïre-Kasai, district of Democratic Republic of Congo.
Distribution
»Middle Congo basin«.