A NEW NEMACHEILUS FROM SUMATRA 

Fig. 3 Mouth of N. tuberigum MZB 9357, male, 48.4 mm SL. Lower lip 
completely separated at the midline; upper lip weakly crenulate, weakly 
papillate in posterolateral part. 
in length between rostral barbels, reaching to end of posterior rostral 
barbel (Fig. 2). Process dentiformis small. Lips moderately fleshy: 
upper lip weakly crenulate to feebly papillose, posterolateral parts of 
upper lip weakly papillose; lower lip with a median incision com- 
pletely separating right and left sides, with 2 or 3 deep pleats on 
either side of median incision. 
Pectoral fin with 11 rays, reaching at most only halfway to 
pelvics; pelvics with 8 rays, nearly reaching anus, anal fin not 
reaching caudal fin. Hindborder of pectoral and pelvic fins with 
prolongations at extremities of rays. Caudal fin forked, short. 
Body fully scaled scales small, ovoid slightly pointed posteriorly. 
Scales on caudal peduncle larger and longer than those from mid- 
body region. Scale rows immediately above and below the lateral 
line on the anterior part of the caudal peduncle with 5—10 obviously 
.=— 

Fig. 4 Scales of N. tuberigum. A. Scale from mid-body below dorsal fin. 
B. Scale from scale row immediately adjacent to lateral line on caudal 
peduncle. These scales usually bear an enlarged tubercle near the 
posterior margin. Anterior to the left; scale bar = 0.1 mm. 
elongate scales (Fig. 4) (l/w for males x = 1.64, s.d. = 0.055, n=5; 
I/w for females x = 1.55, s.d. = 0.097, n = 5), usually tear-drop in 
shape, each bearing a large retrorse tubercle (Fig. 5) as on the 
acuminate scales of N. selangoricus and N. spiniferus. 

Fig. 5 Close up of anterior caudal peduncle of allotype of N. tuberigum (anterior to the left). Lateral line passes through the upper third of the three oval 
lateral blotches; small tubercles are scattered over the caudal peduncle generally. A row of larger tubercles can be seen on either side of the lateral line, 
beginning near the left edge of the second lateral blotch and ending near the left edge of the third blotch. 
