Two new species of glyptosternine catfish of the genus Sineuchiloglanis (Teleostei, Siluriformes, Sisoridae) from the upper Yangtze River drainage, China

Two new species of the genus <i>Sineuchiloglanis</i> are described from two tributaries of the upper Yangtze River, China. These two new species can be distinguished from all congeners by morphological comparisons and phylogenetic analysis. <i>Sineuchiloglanis chishuiensis</i> <b>sp. nov</b>. can be distinguished from its congeners by the combination of the following characters: eye enlarged, with diameter 6.8-9.1% of head length (HL); interorbital width 24.1-24.8% of HL; maxillary barbel length 67.1-84.4% of HL; caudal-peduncle depth 27.1-40.3% of caudal-peduncle length; dorsal-fin rays i, 5^1/2; anal-fin rays i, 4^1/2; caudal-fin rays i, 7+8, i; gill opening extending to the base of second to third pectoral-fin elements; tip of nasal barbel not reaching anterior orbital margin; pelvic-fin tip reaching or extending beyond anus; and the abdomen slightly convex in profile. <i>Sineuchiloglanis baishuiensis</i> <b>sp. nov</b>. can be distinguished from its congeners by the combination of the following characters: head depth 42-48.4% of HL; maxillary barbel length 65.9-82.1% of HL; caudal-peduncle depth 25.9-40.6% of caudal-peduncle length; dorsal-fin rays i, 5^1/2; anal-fin rays i, 4^1/2; caudal-fin rays i, 7+8, i; gill opening extending to the base of the fourth to fifth pectoral-fin elements; tip of maxillary barbel not reaching the lower corner of the gill opening; tip of nasal barbel not reaching anterior orbital margin; and the abdomen flattened in profile. Molecular phylogenetic analysis inferred from mitochondrial <i>Cytb</i> gene sequences supported the validity of these two new species.