Glaucus atlanticusis commonly referred to as Man-Of-War Nudibranch, Blue Glaucus , Sea Swallow, Atlantic Glaucus. Difficulty in the aquarium: Not suitable for aquarium keeping. Toxicity: Toxic hazard unknown.
Circumglobal in warm and tropical Seas and the Mediterranean Sea.
Open pelagic species, washed ashore after storms. This species hangs upside down on the surface film of the water, maintaining buoyancy by swallowing an air bubble.
Feeds on siphonophore, Physalia, Velella, and Porpita.
Live specimens frequently washed up on the beaches.