The bright, contrasting hues of mating Nudibranchs—sea slugs found in reefs and the deep ocean—warn potential predators of their venomous, unpalatable flesh. Equipped with both male and female reproductive organs, each nudibranch fertilizes the other, and both produce eggs.
Bottom-dwelling sea slugs come in all the colors of the rainbow, including blood red and a shade of neon blue that almost makes the above mollusk appear to be ablaze. Most sea slugs are carnivorous and some have sharp jaws and file-like rows of teeth. Called radula, these teeth are used to scrape away a prey's flesh. Although most sea slugs are less than 2 inches in length, some species can grow to be more than 12 inches (30.48 cm) long.
Doto pinnatifida - Description: Doto pinnatifida is one of the largest species of the genus Doto, large individuals reaching 30mm in length. It is characterised by black tipped tubercles on the sides of the body and on the cerata. Occasionally there are a few of these tubercles on the dorsum. The rhinophore sheaths have a series of black spots around the edges.
Wavy Sea Slug. Credit: WoRMS Photo Gallery / Paulay, Gustav, 2010The sea slug Chromodoris kuniei ransoni lives in the islands off the remote archipelago in French Polynesia. The species was first discovered in 1930.