This study describes two new species of Glyptothorax from the Mekong River drainage in Cambodia and Laos. Glyptothorax carnatus can be distinguished from Mekong congeners by its deep body relative to the caudal peduncle (caudal peduncle depth 2.8–3.6 times in body depth at dorsal-fin origin vs. 1.9–3.0) and combination of characters in color pattern, thoracic adhesive apparatus (TAA) morphology, nuchal plate shape, and morphometry. Glyptothorax rhadinus can be distinguished from Mekong congeners by its very slender TAA (width 1.9–2.2 times in its length vs. 1.1–1.9) and a combination of characters in color pattern, thoracic adhesive apparatus (TAA) morphology, nuchal plate shape, and morphometry. Both species have been previously confused with G. fuscus and G. lampris, and comparisons with these two species are provided.
Indochina, Rheophilic catfish, Sisoroidea, Southeast Asia, Morphometry
