This beautiful little nudibranch (to 28 mm or just over an inch) is fairly common in rocky, rubble areas and is always a pleasure to find. Though it is similar to the White Bump, Imperial Nudibranch and the Trembling Nudibranch, its undulating, wavy yellow and white margin, creamy white bumps, deep blue-tipped rhinophores and deep blue gills make it stand out from the others. See Sea Slugs of Hawaii for more info.