Paramonacanthus japonicus

1. Belly flap prominent with a movable bony tip
2. Caudal peduncle deep
3. Caudal fin with long dorsal filament
4. Anterior parts of dorsal and anal fins raised in adult males

Brownish with 2 dark horizontal stripes on sides.

Up to 12 cm.

Indo–West Pacific in tropical waters.

Weedy and sandy areas of coastal reefs, from 34 to 46 m depth.