Abstract
Parakysis hystriculus, new species, is described from the Lalang River drainage in southern Sumatra. It can be distinguished from congeners in having a combination of branched pelvic-fin rays with anterior branch always shorter than posterior branch, lateral edges of head evenly sloping in dorsal view, anteriormost pair of accessory inner mandibular barbels longer than distance separating bases of left and right barbel, outer mandibular barbel with one accessory barbel, mandibular laterosensory pore between bases of inner and outer mandibular barbels present, margin of lower lip with medial concavity, anal fin rounded, caudal fin with narrow lobes having evenly-tapering posteromedial margins and 10 branched rays without secondary branches.
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