Scientific Name: Thuridilla gracilis
Common Name: Graceful thuridilla

Adult Size: 10 – 25 mm
Depth Range: 5 – 20 m
Biotope / Habitat: Shallow coral reefs and rocky outcrops, often found among algae and rubble patches
Diet: Feeds on algae, using its radula to gently scrape out cell contents for nourishment and temporary chloroplast retention (kleptoplasty)
Reproduction: Hermaphroditic; reciprocal mating occurs, with small, coiled egg ribbons laid in protected reef areas
Fun Fact: Thuridilla gracilis is easily recognized by its sleek, leaf-like body in vibrant green and blue shades, with thin white or yellow lines — making it a striking “solar-powered” slug!

This small but stunning slug glides delicately over algae-covered reefs, a favorite for macro photographers and algae-loving reef explorers.