This species is distinguished from its Sundaic congeners except for G. ketambe and G. schmidti in having a uniformly dark body with prominent pale mid-dorsal and midlateral stripes (vs. either uniform body with or without dark spots or a mottled body, all without prominent pale mid-dorsal and midlateral stripes); differs from G. ketambe in having a shorter head 22.6-23.6% SL (vs. 24.0-25.5), a more slender caudal peduncle, its depth 5.8-7.3% SL (vs. 7.6-8.9) and more preanal vertebrae 19-20 (vs. 16-17); differs from G. schmidti in having a longer thoracic adhesive apparatus which reaches to or just beyond (vs. not reaching) the level of the last pectoral-fin-ray bases, 63.4-71.0% HL (vs. 55.1-60.0). It is further distinguished from its Sundaic congeners by the following unique characters: eye diameter 7-8% HL; interorbital distance 28-31% HL; anteromedial striae in thoracic adhesive apparatus is absent; predorsal length 32.1-35.2% SL; dorsal-fin spine length 8.9-14.0% SL; margin of dorsal fin concave, smooth posterior margin of dorsal-fin spine; pectoral-fin spine length 14.0-15.6% SL; adipose-fin base length 11.4-12.8% SL; straight dorsoposterior margin of adipose fin; body depth at anus 11.4-14.3% SL; post-adipose distance 19.1-22.0% SL; caudal peduncle length 19.4-21.2% SL (Ref. 128699).