Pink Flatworm

Prostheceraeus roseus

A delicate ribbon of pink flowing through the reef, this flatworm looks like a silky streamer unfurling over algae and rocks. Its body shifts from soft rose to gentle purple, each edge traced with a faint white line, giving it a dreamlike outline. As it glides with smooth, undulating motions, it almost seems to dance across the shallow waters, its bright coloration warning predators to keep their distance while leaving a trail of hypnotic elegance behind.

• Size: Up to 15 mm
• Range: Tropical Indo-Pacific
• Habitat / Depth: Rocky reef habitats, found at depths ranging from 5–50 m
• Diet: Feeds on ascidians, particularly those in the Pycnoclavella group.