Blue Glaucus: is commonly known as the sea swallow, blue sea and the blue sea slug slug. It's a strange sort of medium-blue sea slug, a pelagic aeolid slug, a marine gastropod mollusk belonging to the family Glaucidae. It is the only species in the genus Glaucus, but it is closely associated with Glaucilla marginata, another member of the family Glaucidae.
Blue Glaucus
Blue Glaucus Images
