Sunday, March 16, 2014

[Ichthyology • 2012] Schistura tenebrosa • A New Species of Loach (Teleostei: Nemacheilidae) from the Kwai Noi River system, Mae Khlong basin, western Thailand

Schistura tenebrosa Kangrang, Page & Beamish 2012

A new species of Schistura is described from the Kwai Noi, Mae Khlong basin, in the Thong Pha Phum District of Kanchanaburi Province in western Thailand. The species is distinguished from all other species of Schistura by a uniform dusky brown color pattern without marks on the dorsum or side of body and with many conspicuous supplementary neuromasts along the lateral line and on the head. It is further distinguished from other species of Schistura lacking marks on the body by its dark brown color, an incomplete lateral line extending only to beneath the dorsal fin, and the origin of the dorsal fin located above the origin of the pelvic fin. The species is small, reaching only 46.0 mm SL, 55.1 mm TL, and inhabits shallow gravel and rubble riffles in small streams. 

Key words: loach, Cypriniformes

Type locality: Thailand, Kanchanaburi Prov., Thong Pha Phum, Mae Khlong basin, Kwai Noi River system, Pakkok River, 14º36'22"N, 98º28'14"E.

Etymology: The name tenebrosa is a Latin adjective for dark or gloomy, and was given in reference to the dusky color of this species.

Kangrang, P.; Page, L.M.; Beamish, F.W.H. 2012: Schistura tenebrosa, A New Species of Loach from the Kwai Noi River system, Mae Khlong basin, Thailand (Teleostei: Nemacheilidae). Zootaxa. 3586: 69-77.