Glyptothorax plectilis sp. nov. is described from the Alas River drainage in northern Sumatra. It can be distinguished from congeners in Sundaland in having a combination of: length of adipose-fin base 12.9–16.7% SL, adipose maximum height 5.3–8.1% SL, caudal peduncle depth 8.4–10.6% SL, body depth at anus 15.3–18.6% SL, head length 25.3– 28.5% SL, snout length 47.9–53.8% HL, premaxillary teeth visible when mouth is closed, anterior and lateral edges of thoracic adhesive apparatus gently convex, diverging pattern of striae running along edges of central depression in thoracic adhesive apparatus, narrow v-shaped depression at posteromedial part of adhesive apparatus open posteriorly, and an almost uniformlycolored body. The taxonomic status of Sundaland Glyptothorax is also briefly discussed.

New taxon: Glyptothorax plectilis Ng and Hadiaty