Pseudophoxinus mehmeti, new cyprinid species from the Alanköy basin in south-western Turkey, is distinguished from all species of Pseudophoxinus in adjacent regions by the combination of the following characters: body slender, its length 1.3-1.5 times its depth; caudal peduncle length 1.6-2.0 times its depth; mouth almost superior, with the tip of the mouth-cleft approximately level with the middle of the pupil; snout with a pointed tip, its length markedly greater than eye diameter; lateral line not complete, with 30-50 perforated scales and 48-60+2 scale rows in lateral series; 11½-13½ scale rows between lateral line and dorsal-fin origin, 3½-5½ scale rows between lateral line and anal-fin origin; dorsal-fin with 6½-7½ branched rays; anal-fin with 6½-7½ branched rays; a distinct black epidermal stripe from eye to caudal-fin base in preserved individuals.