Snout short, broad and bluntly angular in young, narrower in adults; thorns small, blunt, present along dorsal mid-line,
on shoulder, beside spiracle and around upper margin of eye; dorsal fins weakly falcate; 1st dorsal fin 1.2–1.5 taller than 2nd; pectoral fin apices angular; total free vertebral centra 135–144. Body colour greyish brown above, white below; prominent dark pectoral marking usually surrounded by 4–5 white spots; upper body with multiple rows of white spots posterior to level of pectoral markings; a black blotch on anterior half of snout ventrally; orbital membrane usually with curved black markings.