[2] Aeolidia papillosa can be easily identified by its large number of cylindrical cerata covering its body except for a triangular area that extends from the rhinophores to the mid dorsum.

[4] In the order of Nudibranchia, these 'sea slugs' are not considered marine worms but instead mollusks who lack a shell which is a main characteristic in classification.

Inside each ceras, there is a duct that connects to the digestive system as well as a sac called cnidosac that holds defensive stinging nematocysts it acquires from eating its prey cnidaria.

[7] The radula is a feature in majority of mollusks located in the mouth, like a tongue, containing thousands of teeth that help cut up food for digestion by scraping against rocks or even drilling holes in prey in some species.

In internal organs, developing from the stomach is the intestine composing of a thick fold of tissue termed typhlosole which is plesiomorphic to Nudibranchia.

The function of the typhlosole has not been determined, in some clades, it is possible that it aids in a secretion to help excretion of wastes or provides support in digestion of hard structures like sponge spicules.

[9] Other food sources compose of zooxanthellae dinoflagellates which live in mutualistic relationship within the Nudibranch that provide nutrition in the tissues through photosynthesis.

[3] Successful impregnation occurs when the penis of one releases sperm in packets around the mate's vaginal opening which is in the shape of a cone.