2.8M views · 19K reactions | Correction: This species is a dorid, not an aeolid. The appendage is a gill plume used for respiration—not a cerata. Unlike other mollusks, these colorful sea slugs don't have shells or gills. | National Geographic | Facebook

7.2K views · 297 reactions | Meet the Glaucus atlanticus This 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 Aloha! www.oceandefenderadventures.com | OCEAN DEFENDER - Hawaii | Facebook