Scientific Name: Thorunna horologia
Common Name: Clockwork thorunna

Adult Size: 10 – 20 mm
Depth Range: 5 – 30 m
Biotope / Habitat: Coral reef slopes and rocky outcrops, often seen gliding over sponges and encrusting reef structures
Diet: Sponge feeder, using its radula to gently scrape and consume sponge tissue for nutrition and chemical defense
Reproduction: Hermaphroditic; reciprocal mating occurs, with small, coiled egg ribbons laid in protected reef areas
Fun Fact: Thorunna horologia is named for its elegant, clock-like appearance — a delicate white body adorned with fine orange lines and bright orange-tipped gills and rhinophores!

This graceful nudibranch’s refined lines and bold colors make it a highlight for macro photographers and a delight for keen-eyed divers exploring reef slopes.