(chromodoris willani) nudibranch with pale blue with dark blue stripes and blue freckled gills, Mabul, Borneo, Malaysia, South China Sea

underwater seaslug seaslugs sea slug sea slugs chromodoris willani nudibranches nudibranch blue dark blue stripes blue freckled gills mabul borneo malaysia south china sea invertebrates invertebrate coral corals coral reef close up close ups close up close ups