Description. General appearance shown in Figure 2 D. Morphometric and meristic data given in Table 2. Dorsohypural distance equal to distance from dorsal-fin origin to area between anterior portion of snout and posterior margin of pupil. Limit between head and trunk indistinct in lateral view, but more visible in smaller specimens (~ 40 mm SL). Cephalic tubercles present on males, relatively small and few in number. Tubercles distributed on dorsal surface of head from snout to occiput. Lateral line complete (all scales perforated; 24 – 26 + 3 – 4). Dorsal-fin profile blunt with first branched ray being longest dorsal-fin ray. Dorsal-fin origin situated over 12 th lateral-line scale. Tip of adpressed pectoral fin nearly reaching vertical through pelvic-fin insertion. Pelvic fin inserted below 11 th lateral-line scale and distinctly anterior to vertical through dorsal-fin origin. Tip of adpressed pelvic fin extending past anus and in some specimens reaching to anal-fin origin. Anal-fin origin located below 17 th lateral-line scale. Coloration in alcohol. General body coloration in alcohol in alcohol preservation shown in Fig. 2 D. Schematic lateral body pigmentation shown in Fig. 10 C. Lachrymal region superficially pigmented with more peripherally-distributed melanophores. Dusky gular pigmentation decreasing in intensity posteriorly until reaching to vertical through rictus. Peripheral reticulation distinct and covering at maximum 4 1 / 2 longitudinal scale rows along dorsolateral and midlateral portions of body. Basal reticulation prominent and covering up to five longitudinal scale rows and also to dorsal scale row, with network of somewhat continuous chevron-shaped bars. Peripheral and basal reticulation overlapping at maximum on first to fifth longitudinal rows and also on dorsal scale row. Black midlateral stripe rudimentary and replaced by black subdorsal blotch dorsally in contact with anterior portion of axial streak. Blotch rectangular or trapezoid, deeply embedded under approximately two scales at its maximum length and 1 1 / 2 scales at its maximum depth. Distinct black axial streak extending from hypural notch to area above subdorsal blotch, anteriorly diffusing above anterior margin of blotch, and terminating above pelvic-fin insertion. Interspersed swath of melanophores extending along and bordered dorsally by axial streak resulting in faint dusky midlateral stripe. Deeply embedded black basicaudal blotch situated on medial portion of posterior margin of hypural plate with about two scales deep and 1 1 / 2 scales long resulting in somewhat ovoid mark. Dusky dorsolateral stripe indistinct and visible along posterior portion of trunk bordered ventrally by axial streak. Longitudinal light area indistinct, most visible along posterodorsal portion interspersing by reticulated pigmentation. Supra-anal pigmentation absent. Subpeduncular faint. Distal edge of caudal fin pigmented with scattered melanophores resulting in narrow dusky striped margin. Coloration in life. Ground coloration of dorsal surface of head and body pale brown, ventrolateral surface of head and body grey to whitish with silvery sheen due to guanine (Fig. 6 A – C). Dorsum of head largely dusky, with scattered yellowish to greenish reflective patches and streaks on snout, lateral-line canals, meningeal layer, and supraorbital. Anterodorsomedial portions of operculum and upper end of gill slit with reflective yellowish patches (Fig. 6 C). Black pigmentation on lateral body very faint and appearing bluish grey, except for reticulated pattern and basicaudal blotch relatively distinct. Yellowish reflective middorsal stripe present and distinct on dorsum of body, extending from nape to dorsal caudal peduncle (Fig. 6 B). Reflective midlateral stripe absent. All fins hyaline. Dorsal, anal, and caudal fins with yellowish sheen on subdistal portion of branched rays. Habitat and distribution. The specimens of Rasbora bindumatoga were collected in gravel-bottomed mountain streams and moderate-flowing turbid rivers. This species is known from the Aek Sibundung, Batang Toru, and Batang Gadis Rivers that flow into the Indian Ocean in the southern part of northwestern Sumatra, and also from a tributary draining to Lake Toba (Fig. 8). It was collected sympatrically with R. api.
Sumber: Four new species of Rasbora of the Sumatrana group (Teleostei: Cyprinidae) from northern Sumatra, Indonesia