Schizothorax nudiventris Yang, Chen & Yang 2009

Schizothorax nudiventris can be distinguished from its congeners by a combination of the following characters: snout blunt; upper lip thin; lower lip developed, trilobed, the median lobe minute, the lateral lobes forming a splayed. Postlabial groove continuous. Thorax scaleless in mature individuals; distal onefourth of last unbranched dorsal-fin ray soft and articulated, proximal three-fourths of it strong, with 15−21 serrae along its posterior edge; pelvic-fin origin beneath or posterior to vertical through dorsal-fin origin; irregular black spots scattered along lateral line on flank; eye diameter mean 92.0 % of maxillary barbel. Schizothorax nudiventris is further distinguished from the sympatric S. lissolabiatus Tsao and S. dolichonema Herzenstein by the absence (vs. presence) of a horny sheath on the lower jaw and having a smooth, trilobed lower lip (vs. bi-lobed in S. lissolabiatus and papillated and single-lobed lower lip in S. dolichonema). Schizothorax nudiventris is further distinguished from another species from the same drainage, S. yunnanensis, by having a continuous (vs. discontinuous) postlabial groove; last unbranched dorsal-fin ray strong (vs. soft); length of barbels equal to or longer (vs. shorter) than eye diameter. Schizothorax nudiventris resembles the sympatric S. lantsangensis Tsao, with which is shares a scalesless thorax, lower lip tri-lobed and postlabial groove continuous, but differs from it in having larger eyes [diameter 57.2−160.0 % (mean 92.0) maxillary barbel vs. 33.9−60.1 % (mean 46.1)]; scales in transverse series from dorsal-fin origin to lateral line 27−34 (12*) (vs. 33−40 (9*)); median lobe of lower lip distinct, free and smooth (vs. indistinct and covered with papillae) (Ref. 80483).

In the Lancang Jiang River, Schizothorax nudiventris usually coexists with the cyprinid species Schizothorax lissolabiatus Tsao, the sisorid catfishes Pseudecheneis immaculatus Chu, Glyptothoraxzainaensis Wu, He & Chu, Pareuchiloglanis gracilicaudata (Wu & Chen), and Pareuchiloglaniskamengensis (Jayaram); the balitorid loach Triplophysa brevicauda (Herzenstein), Paracobitis anguillioides Zhu & Wang and botiid loach Sinibotia longiventralis Yang & Chen (Ref. 80483).

Schizothorax nudiventris is a species of ray-finned fish in the genus Schizothorax, from the upper reaches of the Mekong River in China.