Glyptothorax ketambe can be distinguished from all other Sundaic congeners except G.

schmidti and G. siamensis in having a color pattern consisting of a dark brown body with yellowish midlateral and mid-dorsal stripes. It differs from G. schmidti in having a deeper caudal peduncle (7.6–8.9% SL vs. 5.8–7.3) and a less posteriorly-extended thoracic adhesive apparatus (not reaching vs. reaching to the level ofthe base of the last pectoral-fin ray) and from G. siamensis in having a narrower head (16.1–17.9% SL vs. 17.2–20.1) and an almost straight (vs. noticeably curved) lateral margin of the thoracic adhesive apparatus. There are eight other congeners from mainland Southeast Asia that share a similar color pattern of a

dark-colored body (with or without distinct pale midlateral and mid-dorsal stripes) with G. ketambe: G. coracinus, G. interspinalus, G. laosensis, G. longicauda, G. longjiangensis, G. strabonis, G. trilineatus and G.

zanaensis. Glyptothorax ketambe is distinguished from G. coracinus in having a wider interorbital distance (29.0–31.2% HL vs. 26.2–26.7), from G. interspinalus in having a deeper caudal peduncle (7.6–8.9% SL vs.

6.1–8.0) and a narrower head (16.1–17.9% SL vs. 17.2–22.1), from G. laosensis in having a narrower head (16.1–17.9% SL vs. 19.2–21.1) and a less posteriorly-extended thoracic adhesive apparatus (not reaching vs. reaching beyond the level of the base of the last pectoral-fin ray), and from G. longicauda in having a shorter

caudal peduncle (20.1–22.9% SL vs. 23.6) and fewer vertebrae (37–38 vs. 42). It differs from G. longjiangensis in having tubercles on the dorsal surface of the head with a single, median ridge (vs. with anastomosing tubercles with multiple ridges) and without any pale markings on the nuchal plate (vs. part or all of the nuchal plate pale-colored), from G. strabonis in having a larger eye (7.5–9.6% HL vs. 6.2–6.5), interorbital distance (29.0–31.2% HL vs. 26.0–27.2) and fewer serrations on the posterior margin of the pectoral spine (9–12 vs. 14–16), from G. trilineatus in having a longer caudal peduncle (20.1–22.9% SL vs. 16.7–18.4), and from G. zainaensis in having a shorter adipose-fin base (12.0–14.5% SL vs. 14.4–18.4), and a less posteriorly-extended thoracic adhesive apparatus (not reaching to the level of the base of the last pectoralfin ray vs. reaching beyond) (Ref. 80807).