Scientific Name: Goniobranchus geminus
Common Name: Twin goniobranchus

Adult Size: 20 – 40 mm
Depth Range: 5 – 30 m
Biotope / Habitat: Coral reef slopes and rocky outcrops, often seen on sponges and encrusting corals
Diet: Sponge feeder, using its radula to scrape away sponge tissue for nourishment and chemical defense
Reproduction: Hermaphroditic; mates reciprocally, laying delicate, coiled egg ribbons in hidden reef crevices
Fun Fact: Goniobranchus geminus is named for its “twin” color patterns — typically white with vibrant dark spots and a striking purple margin, making it a vivid presence on the reef.

This beautiful nudibranch is a true eye-catcher, gliding gracefully over coral rubble and sponges with its bold and symmetrical color patterns.