Schematic illustration of A body measurements B (lateral) and C (dorsal) head measurements, and D (ventral) head and gular disc (as defined in Kottelat (2020)) measurements. For a detailed description see Suppl. material 1: Table S2. 1, standard length (SL); 2, body depth at dorsal-fin origin; 3, minimum caudal-peduncle depth; 4, maximal caudal-peduncle depth; 5, predorsal length; 6, prepelvic length; 7, preanal length; 8, pectoral – pelvic distance; 9, pelvic – anal distance; 10, vent distance; 11, caudal-peduncle length; 12, dorsal-fin depth; 14, depth of 1st branched dorsal-fin ray; 19, anal-fin depth; 20, pectoral-fin length; 21, pelvic-fin length; 22, length of axillary scale; 23, head length; 24, head depth at nape; 25, head depth at eye; 26, head width at posterior end of operculum; 27, head width at eyes; 28, width between nostrils; 29, snout length; 30, eye horizontal diameter; 31, orbit – operculum distance; 32, interorbital width; 33, anterior barbel length; 34, posterior barbel length; 35, disc length; 36, length of torus; 37, length of pulvinus; 38, length of labrum; 39, disc width; 40, width between anterior barbels; 41, width of mouth; 42, width of torus; 43, width of pulvinus. Not illustrated are: 13, depth of last unbranched dorsal-fin ray; 15, depth of 2nd branched dorsal-fin ray; 16, depth of 3rd branched dorsal-fin ray; 17, depth of 4th branched dorsal-fin ray; 18, depth of 5th branched dorsal-fin ray.