Identification:
This striking flatworm is distinguished by its elongated body, beautifully lined with longitudinal stripes in shades of purple, white, yellow, brown, or black. The stripes run parallel along the entire body, often highlighted by a translucent edge that may ripple as the worm glides. Its head is slightly widened, forming subtle tentacle-like lobes, while the posterior end tapers smoothly. The distinctive pattern and symmetry give it a delicate, almost painted look.

Size:
Up to 3 cm in length.

Habitat:
Commonly observed on coral rubble, under overhangs, or crawling over sponges and encrusting organisms. Often found in shallow reef flats or slopes.

Depth Range:
3 – 25 meters

Diet:
Feeds primarily on sessile invertebrates, including colonial tunicates and sponges, using its extendable pharynx to digest food externally before ingestion.

Reproduction:
Like most polyclads, Prostheceraeus species are simultaneous hermaphrodites. After cross-fertilization, they lay egg masses in protected reef areas. Larvae are planktonic before settling and transforming into the adult form.

Fun Fact:
Their eye-catching striped pattern may serve as disruptive camouflage, helping them blend into the textured reef background while also warning predators of potential toxicity.