Can be diagnosed from other species of Aphanius, Valenciidae and Fundulidae in Europe by having the following characters: males possess a hyaline to bluish-grey caudal fin, with 2-5 dark grey bars, 10-20 dark grey to dark blue bars on a silvery background, bars usually irregularly shaped and set, often connected, breaking up into a mosaic of dark blue and silvery spots along back and in posterior part of body; females have numerous dark brown spots on sides and back; 23-27 scales in lateral line series on body; pectoral fin with 9-10 rays; and anal fin with 7-8 rays (Ref. 59043).