Scientific Name: Goniobranchus geometricus
Common Name: Geometric goniobranchus

Adult Size: 20 – 40 mm
Depth Range: 5 – 30 m
Biotope / Habitat: Coral reefs and rocky slopes, usually seen on sponges and coral rubble
Diet: Sponge feeder, using a specialized radula to consume specific sponge species for nourishment and chemical defenses
Reproduction: Hermaphroditic; mates reciprocally, with eggs laid in fine, spiral ribbons on or near their sponge food source
Fun Fact: Goniobranchus geometricus is renowned for its bold, polygonal white spots set against a dark brown to black body, making it one of the most striking nudibranchs in the Indo-Pacific!

This visually arresting nudibranch glides over the reef with an unmistakable, checkerboard-like pattern that’s perfect for underwater photographers and macro enthusiasts.