Identification of sea slugs are often difficult. The keys to identification in this case is the broken purple rigde together with the placement of the three mantle lobes on both sides of the body. One lobe on either side of the head, one on the side of the gills, and one between those two.

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Purple-Edged Ceratosoma

The blue-ringed octopus flashes its 50-60 rings within a third of a second as a warning display to predators. Being one of the world's most venomous marine animals, its poison causes total body paralysis—also to humans.

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Blue-Ringed Octopus

Cuttlefish have three hearts! One that pumps blood around the body and two pumping blood to the gills.