Alburnoides idignensis is distinguished by a combination of the following characters: an unbranched ray of pectoral fin strongly lined with melanophores on its inner margin; eye with average size, the orbit diameter larger than the snout length and markedly smaller than the interorbital width; caudal fin lobes rounded and fin shallowly forked; a variably scaled ventral keel though most commonly scaled along about 1/3-2/3 of its length; a deep head with a markedly rounded, stout snout; a small mouth which is between terminal and subterminal; a tip of the mouth cleft on a level from the lower margin of the pupil; dorsal fin commonly with 8½ branched rays; anal fin with 10-12(13-14)½ branched rays; 41-49(50-51) total lateral line scales (39-49 scales to posterior margin of hypurals); commonly 2.5-4.2 or 2.4-4.2 pharyngeal teeth; total vertebrae 38-40, with a mode of 39; predorsal vertebrae 11-13; abdominal vertebrae 19- 20; caudal vertebrae 19-20; a caudal vertebral region most commonly one vertebra shorter or one vertebra longer than the abdominal region; the most common vertebral formulae are 20+19 and 19+20, and the difference between the abdominal and caudal counts averaging 0 (Ref. 82592).