1Rue des Rauraques 6, 2800 Delémont, Switzerland (permanent address); and Lee Kong Chian Natural History Museum, National University of Singapore, 2 Conservatory Drive, Singapore 117377..
Zootaxa. 2021 Feb 19;4933(2):zootaxa.4933.2.6. doi: 10.11646/zootaxa.4933.2.6.
'Nemacheilus' argyrogaster, new species, is described from the Xe Kong, Mekong drainage, in Attapeu and Xe Kong provinces, southern Laos. It is distinguished from all other Nemacheilidae in Southeast Asia by its unique colour pattern made of a bold black midlateral stripe separating the yellowish brown dorsal part of the body from the silvery whitish ventral part and a middorsal row of 14-19 thin saddles. Besides, the male has a globulous suborbital flap with tubercles along its free, posterior edge, and the pectoral fin with thickened anterior ray and branched rays 1-4 and unculiferous pads behind them covered by small tubercles; lips thin, lower lip continuous with a narrow median notch. It was found in moderate to fast flowing water, over pebble to stone bottom. 'Nemacheilus' argyrogaster, was earlier misidentified as N. longistriatus; it is provisionally placed in the genus Nemacheilus.
新种湄公鱼属（Nemacheilus） argyrogaster 产自老挝南部阿速坡省和色贡省的色贡河（Xe Kong），即湄公河水系。其独特的颜色图案由一条鲜明的黑色侧条纹分隔，将身体的黄褐色背部与银白色腹部区分开来，身体中部还有 14-19 个细的鞍状斑，使其与东南亚的其他湄公鱼科鱼类明显不同。此外，雄鱼具有球状的眶下瓣，其游离的后缘有小瘤，胸鳍具有加厚的前鳍条和分支鳍条 1-4，以及其后有小瘤覆盖的无鳍棘的鳍垫；嘴唇薄，下唇与狭窄的中央凹口相连。该种鱼生活在中等到快速流动的水中，水底为卵石或石块。湄公鱼属（Nemacheilus） argyrogaster 曾被错误地鉴定为 N. longistriatus；目前将其暂置于湄公鱼属（Nemacheilus）中。
