Diagnosis: Notoglanidium walkeri differs from other species in the genus in having: an average interorbital distance, 27.8-33.3% of head length vs. smaller in N. boutchangai, N. depierrei, N. pallidum and N. pembetadi, and larger in N. maculatum and N. thomasi; a relatively small combined premaxillary tooth plate width, 13.7-16.1% of head length vs. larger in N. akiri, N. boutchangai, N. macrostoma and N. pembetadi; and a relatively large number of soft dorsal-fin rays, 11-15 vs. less in N. akiri, N. boutchangai, N. depierrei and N. macrostoma, and more in N. maculatum (Ref. 94168).

Description: A small, elongate species, about 6 times as long as deep; snout nor body much depressed, predorsal body depth 14.1-20.2% of standard length, minimal caudal peduncle depth 13.0-14.6% of standard length, head depth 53.6-66.0% of head length (Ref. 57126, 94168). Occipital process scarcely developed and distinctly seprated from nuchal plates; humeral spine well visible (Ref. 57126). Eyes very small, round and in dorsal position (Ref. 57126). Branchiostegal membranes completely fused (Ref. 94168). Dorsal fin with short spine, 3.2-7.0% of standard length (Ref. 94168).

Colouration: In life, yellowish brown, with round dark spots scattered around body and fins (Ref. 94168). Preserved specimens are more or less yellowish, with black spots irregularly scattered on body and fins (Ref. 57126).