Lobocheilos

Ikhwanuddin, Mat Esa Mohd, Amal, Mohammad Noor Azmai, Aziz, Azizul, Sepet, Johari, Talib, Abdullah, Ismail, Muhammad Faiz & Hashim, Nor Rasidah, 2017, Inventory of fishes in the upper Pelus River (Perak river basin, Perak, Malaysia), Check List 13 (4), pp. 315-325 : 320

Lobocheilos bo ( Popta, 1904)

Lobocheilos bo Popta 1904: 199.

Tylognathus boïdes Popta 1906: 119 .

Material examined. Table 1; Figure 3g.

It differs from congeners from Java, Sumatra and Bor- neo ( Lobocheilos falcifer , L. lehat , L. schwanenfeldii and L. kajanensis ) by having the following unique combina- tion of features: total of 11 soft dorsal-fin rays and 8 soft anal-fin rays; scales on lateral line 30–31 + 3; absence of black blotch on end of caudal peduncle; absence of crescentic mark along posterior edge of scales; 2 barbels, shorter than eye diameter when present; pectoral fin extending to or almost to the pelvic-fin origin; pelvic fin extending to anal-fin origin; dorsal-fin tip reaching behind vertical through anal-fin origin, when folded backwards; scale rows between lateral line and dorsal-fin origin at 5–6½; and curved sheath edge of lower jaw ( Kottelat and Tan 2008). The fish juveniles are common in shallow, fast flowing areas with gravel substrate ( Martin-Smith and Tan 1998).

Mystacoleucus marginatus ( Valenciennes, 1842) Systomus marginatus Valenciennes 1842: 472 .

Material examined. Table 1; Figure 3h.

This species is identified by the following combina- tion of characters: 24–26 + 2 scales on lateral line; 14 circumpeduncular scale rows; anal fin with a convex distal margin; dorsal fin with black anterior and distal portions; caudal fin with black distal margin; most scales of body with a black, crescent-shaped base. This species can be found at bottom depths of rivers and streams, and inhabits areas with sand or pea-gravel from small streams to large rivers ( Rainboth 1996).

Neolissochilus hexagonolepis ( McClelland, 1839) Acrossocheilus hexagonolepis McClelland 1839: 217 .

Material examined. Table 1; Figure 3i.

This species is identified by having two gill rakers at upper arm and 8 gill rakers at lower arm on the first gill arch; 27 scales on lateral line; nine dorsal-fin ray with 2 simple rays; 8 ventral-fin rays with 1 simple ray; 14 pectoral-fin rays with 1 simple ray; 6 anal-fin rays with 1 simple ray ( Laskar et al. 2013); color pattern having scales coppery colored with a tinge of red above lateral line and fins deeply slate paling towards their margins. Neolissochilus hexagonolepis differs from N. stracheyi by having absence of a lateral black stripe. The adults of N. hexagonolepis occur in fast flowing streams and riv- ers with rocky bottom, mainly in the middle of streams ( Menon 1999). They are omnivorous and the adults feed mainly on filamentous green algae, chironomid larvae, crustaceans and water beetles ( Ferro and Badagami 1980).