Body very deep and compressed, its depth 1.7-1.85 times in SL. Small head with pointed snout. Small mouth with close-set teeth, 20 in the upper jaw and 22 in the lower jaw. Eye in the upper part of the head. A lancet-like horizontal spine on the caudal peduncle which can be folded into a shallow groove. High dorsal fin, the first ray longer than the last spine. Anal fin with round posterior edge. Caudal fin rounded to truncated. Pectoral fin above pelvic fin, both slightly pointed.
Dark navy blue to deep purple body with many black dots on the head and anterior body and abdomen. The edges of pectoral fins and caudal fin are bright yellow.
5-20 cm (max 22cm)
The color pattern distinguishes this species from all Mediterranean fish species.
BIOLOGY / ECOLOGY
Live in pairs or small groups. Feeds on benthic algae. Eggs and larvae planktonic.
Coral and rocky substrate to depth of 50 m.