Scientific Name: Halgerda formosa
Common Name: Beautiful halgerda

Adult Size: 30 – 60 mm
Depth Range: 10 – 40 m
Biotope / Habitat: Found on coral reef slopes and rocky outcrops, typically on or near sponges
Diet: Sponge feeder, using its radula to scrape and consume sponge tissue for nutrition and chemical defense
Reproduction: Hermaphroditic; reciprocal mating occurs, with delicate, spiral-shaped egg ribbons laid in protected reef crevices
Fun Fact: Halgerda formosa’s white body with bright orange ridges and fine black lines make it a true showstopper, standing out among reef rubble and coral gardens.

This visually striking dorid nudibranch is a highlight for keen-eyed divers and underwater photographers, gliding elegantly over sponges and rubble zones in search of its next meal.