06/02/2026
The Monoceros Masked Heniochus is a striking and uncommon butterflyfish recognized for its bold black facial mask, contrasting white body, and elegant banner-like dorsal filament. Native to the Indo-Pacific, this graceful species inhabits outer reef slopes and lagoons, where it is often seen swimming in pairs or small groups. Its distinctive coloration and elongated dorsal streamer make it a standout addition to large marine displays.