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Schistura crocotula, a new loach (Teleostei: Nemacheilidae) from southern Thailand.
... Besides, new species and genera are still regularly described (e.g. Bohlen & ล lechtovรก 2010Bohlen & ล lechtovรก , 2013aOu et al. 2011, Plongsesthee et al. 2013, Bohlen et al. 2014, 2016Kottelat 2012bKottelat , 2017aKottelat -h, 2018. ...
Rhyacoschistura, new genus, belongs to a group of genera (Physoschistura, Mustura, Pteronemacheilus, Petruichthys) characterised by the modified branched pectoral-fin rays of males, with a very thick first ray, usually without membranes between some of the branches and/or rays, and anterior rays and/or membranes covered by small tubercles at maturity. Rhyacoschistura is distinguished from them by the combination of: presence of a suborbital flap; emarginate caudal fin; lower lip with a wide median interruption and connected to isthmus by a frenum; body depth about equal from behind head to caudal-fin base. Rhyacoschistura larreci, new species, is described from the Mekong drainage in Xayaburi Province, Laos. It is distinguished by details of the morphology of the pelvic fin, and its colour pattern (flank with numerous narrow slanted bars, very irregularly organised and shaped, more or less connected, or sometimes covering the whole flank). Schistura suber, from Nam Ngum watershed, is redescribed on the basis of adults and placed in Rhyacoschistura.
... The genus has its greatest diversity in Southeast Asia (Irrawaddy, Salween, Mae Khlong, Chao Phraya, Mekong, and Red River drainages, and drainages in between) from where about 160 species have been described; most are described and figured in Kottelat (1990Kottelat ( , 1998Kottelat ( , 2000Kottelat ( , 2001 and Freyhof & Serov (2001). Besides, new species are still regularly described (e.g., Bohlen & ล lechtovรก, 2010Bohlen & ล lechtovรก, , 2013aBohlen & ล lechtovรก, , 2013bOu et al., 2011;Plongsesthee et al., 2013;Bohlen et al., 2014Bohlen et al., , 2016Kottelat, 2017a-f). The interrelationships within Schistura have not been studied but accumulating morphological, molecular and distribution data unsurprisingly show that the genus is paraphyletic (pers. ...
... New species are still regularly described (e.g. Bohlen & ล lechtovรก 2010Bohlen & ล lechtovรก , 2013aOu et al. 2011;Plongsesthee et al. 2011Plongsesthee et al. , 2013Chen & Neely 2012;Bohlen et al. 2014Bohlen et al. , 2016Kottelat 2017a-f). The interrelationships within Schistura have not been thoroughly studied yet but the accumulating morphological, molecular and distribution data unsurprisingly show that the genus is paraphyletic (Kottelat 1990, 2017b-c andunpublished; see also, e.g., Freyhof et al. 2016). ...
Schistura epixenos, new species, is described from the Nakai Plateau in Laos. It is distinguished from its congeners in Southeast Asia with a pattern of dark brown bars on a pale brown background by a combination of characters including, among others, a slender body, body with 13โ17 bars reaching downwards to the level of the pectoral fin, a complete lateral line, scales present in the predorsal area, and the pelvic-fin origin below the dorsal-fin origin.
Fish species were collected by electrofishing from 96 sites, representing 79 species, in lightly exploited rivers in western Thailand. Significant chemical and physical environmental factors associated with species numbers and total fish abundance were identified using multiple linear regression. Total abundance correlated negatively with water depth and temperature (r = 0.4, p < 0.05), whereas species numbers correlated positively with river discharge and negatively with elevation (r = 0.6, p < 0.05). Chemical and physical factors that significantly influenced species distribution were determined using partial least squares regression analysis, (p < 0.05; axes 1, r = 0.8; axes 2, r = 0.85), and included elevation, river discharge, width and depth as well as ambient oxygen, alkalinity and pH. Fish were placed into four categories according to their habitat occupancy and abundance and termed; uncommon (54 species), common (16 species), even (8 species) and uneven (1 species), respectively.
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