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Brief facts about velella:

Velella is a monospecific genus of hydrozoa in the Porpitidae family. Its only known species is Velella velella, a cosmopolitan free-floating hydrozoan that lives on the surface of the open ocean. It is commonly known by the names sea raft, by-the-wind sailor, purple sail, little sail, or simply Velella. This small cnidarian is part of a specialised ocean surface community that includes the better-known cnidarian siphonophore, the Portuguese man o' war. Specialized predatory gastropod molluscs prey on these cnidarians. Such predators include nudibranchs in the genus Glaucus and purple snails in the genus Janthina. Each apparent individual is a hydroid colony, and most are less than about 7 cm long. They are usually deep blue in colour, but their most obvious feature is a small stiff sail that catches the wind and propels them over the surface of the sea. Under certain wind conditions, they may be stranded by the thousand on beaches. Like other Cnidaria, Velella velella are carnivorous.

Porpita porpita - Porpita porpita, or the blue button, is a marine organism consisting of a colony of hydroids found in the warmer, tropical and sub-tropical waters of the Pacific, Atlantic, and Indian oceans, as well as the Mediterranean Sea and eastern Arabian Sea.

Glaucus atlanticus - Glaucus atlanticus is a species of sea slug in the family Glaucidae. These sea slugs live in the pelagic zone, where they float upside-down by using the surface tension of the water to stay afloat. They are carried along by the winds and ocean currents.

Taxa named by Jean-Baptiste Lamarck