Serpent Pteraeolidia

Blue Dragon nudibranchs are very common to the southeast coast of Australia and have a few color variations. Juveniles are white with blue rhinophores, and adults vary from dark purple to lavender to golden brown.
(Bill Kuiper)

"Blue Dragon nudibranchs are very common to the southeast coast of Australia and have a few color variations. Juveniles are white with blue rhinophores, and adults vary from dark purple to lavender to golden brown. I have seen these grow to a length of approximately 4 inches," wrote Bill Kuiper of his image, a winning selection in the Portraits of Planet Ocean Flickr contest. Like other aeolid nudibranchs, blue dragons (Pteraeolidia ianthina) steal stinging cells from their jellyfish prey and reuse them as defensive weapons! See more winning photos.