Description. General appearance shown in Fig. 2 B. Morphometric and meristic data given in Table 1. Dorsohypural distance equal to distance from dorsal-fin origin to area between tip of snout and vertical through anterior margin of nostril. Limit between head and trunk distinguishable by abrupt convexity of anterior predorsal profile relative to slant of head profile. Cephalic tubercles observable from one specimen of male, relatively small and very few, distributed on dorsal surface of head especially on supraorbital area. Lateral line complete (all scales perforated; 23 – 25 + 3 – 5). Dorsal-fin origin situated over 11 th or 12 th lateral-line scale. Tip of adpressed pectoral fin extending beyond vertical through pelvic-fin insertion. Pelvic fin inserted below 10 th or 11 th lateral-line scale and distinctly anterior to vertical through dorsal-fin origin. Tip of adpressed pelvic fin reaching anal-fin origin. Anal-fin origin located below 17 th or 18 th lateral-line scale. Coloration in alcohol. General body coloration in alcohol preservation shown in Fig. 2 B. Schematic lateral body pigmentation shown in Fig. 7 B. Lachrymal region superficially pigmented with dorsal portion more densely pigmented. Dusky gular pigmentation extending posteriorly to vertical through rictus. Fleshy opercular flap pigmented with scattered small melanophores. Background pigmentation overall dusky and reticulated. Peripheral reticulation relatively thick and very distinct and covering at maximum 4 1 / 2 longitudinal scale rows along dorsolateral and midlateral portions of body, and also dorsal scale row. Basal reticulation relatively thick and prominent, covering up to 5 longitudinal scale rows and also to dorsal scale row, with network of continuous parenthesis-shaped bars. Peripheral and basal reticulations not overlapping along lateral-line scales. Black midlateral stripe prominent, more intense on central portion, and overall appearing as stamen-like profile. Stripe slightly narrowing anteriorly until abruptly ending over 6 th or 7 th lateral-line scale, attenuating posteriorly until appearing as thin line of melanophores and extending to form trace of scattered melanophores along caudal peduncle reaching black basicaudal blotch. Black basicaudal blotch consisting two elements: basicaudal triangular patch and deeply-embedded darker basicaudal spot. Triangular patch of black basicaudal blotch originating posterior to hypural notch and flaring posteriorly at maximum to distance equal to one-half of caudal-peduncle depth until becoming confluent with basicaudal spot. Basicaudal spot terminating anterior to last sheath scale of caudal fin. Axial streak prominent and posteriorly bordering dorsal margin of black midlateral stripe, but streak separate from stripe below area between posterior terminus and mid-portion of dorsal-fin base. Streak decreasing in intensity anteriorly until disappearing above 7 th lateral-line scale. Dusky dorsolateral stripe very faint, most visible along anterior half of trunk. Longitudinal light area indistinct, most visible along anterior half of trunk ventral to axial streak. Supra-anal pigmentation distinct, appearing as thin stripe originating slightly posterior to anal-fin origin and terminating at vertical through base of last branched anal-fin ray. Subpeduncular pigmentation barely visible. Distal border of caudal fin pigmented with scattered melanophores. Habitat and distribution. This species is known from the Bohorok River that flows into the Malacca Strait in the northeastern part of Sumatra (Fig. 8).
