Glaucus atlanticus is a species of small, blue sea slug, a pelagic aeolid nudibranch, a shell-less gastropod mollusk in the family Glaucidae. These sea slugs are pelagic; they float upside down by using the surface tension of the water to stay up, where they are carried along by the winds and ocean currents. Wikipedia

Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Order: Nudibranchia
Suborder: Cladobranchia
Family: Glaucidae
Genus: Glaucus
Species: G. atlanticus

Are Blue Dragon sea slugs poisonous: For this reason, the Blue Glaucus poses a much greater threat to humans than the Portuguese man o' war. Picking one up may result in a painful sting and symptoms similar to those of its prey. These include nausea, vomiting, and pain. But like other sea slug species, the Blue Glaucus itself isn't venomous.

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