Velella
Close-up of a Velella velella colony
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Cnidaria
Class:	Hydrozoa
Order:	Anthoathecata
Family:	Porpitidae
Genus:	Velella Lamarck, 1801[1]
Species:	V. velella
Binomial name
Velella velella (Linnaeus, 1758)
Synonyms
List (Genus) Armenista Haeckel, 1888 Rataria Eschscholtz, 1829 Velaria Haeckel, 1888 (Species) Armenista sigmoides Haeckel, 1888 Holothuria spirans Forsskål, 1775 Medusa pocillum Montagu, 1815 Medusa velella Linnaeus, 1758 Rataria cordata Eschscholtz, 1829 Rataria mitrata Eschscholtz, 1829 Velella antarctica Eschscholtz, 1829 Velella aurora Eschscholtz, 1829 Velella australis de Haan, 1827 Velella caurina Eschscholtz, 1829 Velella cyanea Lesson, 1826 Velella emarginata Quoy & Gaimard, 1824 Velella indica Eschscholtz, 1829 Velella lata Chamisso & Eysenhardt, 1821 Velella limbosa Lamarck, 1816 Velella meridionalis Fewkes, 1889 Velella mutica Lamarck, 1801 Velella oblonga Chamisso & Eysenhardt, 1821 Velella oxyothone Brandt, 1835 Velella pacifica de Haan, 1827 Velella patellaris Brandt, 1835 Velella pyramidalis Cranch, 1818 Velella radackiana de Haan, 1827 Velella sandwichiana de Haan, 1827 Velella scaphidia Peron & Lesueur, 1807 Velella septentrionalis Eschscholtz, 1829 Velella sinistra Chamisso & Eysenhardt, 1821 Velella tentaculata Lamarck, 1801 Velella tropica Eschscholtz, 1829

Velella is a monospecific genus of hydrozoa in the Porpitidae family. Its only known species is Velella velella,^[2] a cosmopolitan (widely distributed) 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.^[3]

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 (sea slugs) in the genus Glaucus^[4] and purple snails in the genus Janthina.^[5]

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.^[6]

Like other Cnidaria, Velella velella are carnivorous. They catch their prey, generally plankton, by means of tentacles that hang down in the water and bear cnidocysts (also called nematocysts). The toxins in their nematocysts are effective against their prey. While cnidarians all possess nematocysts, in some species the nematocysts and toxins therein are more powerful than other species. V. velella's nematocysts are relatively benign to humans, although each person may respond differently to contact with the nematocyst toxin. It is wise to avoid touching one's face or eyes after handling V. velella, and itching may develop on parts of the skin that have been exposed to V. velella nematocysts.

Velella velella lives in warm and temperate waters in all the world's oceans. They live at the water/air interface, with the float above the water, and polyps hanging down about a centimetre below. Organisms that live partly in and partly out of the water like this are known as neuston.^[7] Offshore boaters sometimes encounter thousands of V. velella on the water surface.^{[citation needed]}

The small rigid sail projects into the air and catches the wind. However, Velella sails always align along the direction of the wind where the sail may act as an aerofoil, so that the animals tend to sail downwind at a small angle to the wind.^[8] Having no means of locomotion other than its sail, V. velella is at the mercy of prevailing winds for moving around the seas, and are thereby also subject to mass-strandings on beaches throughout the world. For example, a mass stranding occurs most years in the spring along the West Coast of North America, from British Columbia to California, beginning in the north and moving south over several weeks' time. In some years, so many animals are left at the tide line by receding waves, that the line of dying (and subsequently rotting) animals may be many centimetres deep, along hundreds of kilometres of beaches.^{[citation needed]} Mass strandings have been reported also on the west coast of Ireland,^[9] and in Hayle, on the west coast of Cornwall in England.^[10]

Like many Hydrozoa, Velella velella has a bipartite life cycle, with a form of alternation of generations. The deep blue, by-the-wind sailors that are recognized by many beach-goers are the polyp phase of the life cycle. Each "individual" with its sail is really a hydroid colony, with many polyps that feed on ocean plankton. These are connected by a canal system that enables the colony to share whatever food is ingested by individual polyps. Each by-the-wind sailor is a colony of all-male or all-female polyps. The colony has several different kinds of polyps, some of which are both feeding and reproductive, called gonozooids, and others protective, called dactylozooids.^[11]

The gonozooids each produce numerous tiny jellyfish by an asexual budding process, so that each Velella colony produces thousands of tiny jellyfish (medusae), each about 1 mm high and wide, over several weeks. The tiny medusae are each provided with many zooxanthellae, single-celled endosymbiotic organisms typically also found in corals and some sea anemones, that can utilize sunlight to provide energy to the jellyfish. Curiously, although a healthy captive Velella will release many medusae under the microscope, and are expected to do the same in the sea, the medusae of Velella are rarely captured in the plankton and very little is known about their natural history. The medusae develop to sexual maturity within about three weeks in the laboratory and their free-spawned eggs and sperm develop into a planktonic larva called a conaria, which develops into a new floating Velella hydroid colony.^[11]

The Porpitidae is a family of the Hydrozoa erected for two genera of hydroids that live floating free at the surface of the open ocean: Velella and Porpita. The systematic position of these peculiar genera has long been a topic of discussion among taxonomists who work with pelagic Cnidaria. The three genera^{[clarification needed]} were put in with athecate hydroids in the mid-to-late 19th century by some, whereas other authors at the time included them in the Siphonophorae. A new order was established for these genera by Totton,^[12] in 1954, called the Chondrophora, while at the same time, other authors favored again placing them in the Anthomedusae/Athecatae.^[11] Most authors in the past 40 years have accepted interpretation of these animals as unusual floating colonial athecate hydroids, which produce medusae clearly belonging in the Anthomedusae. Although the exact position of the family Porpitidae within the Athecatae/Anthomedusae is not yet clear, the order Chondrophora is no longer used by hydrozoan systematists.^{[citation needed]}

• Porpita porpita
• Glaucus atlanticus

Wikimedia Commons has media related to Velella velella.

• Animal Diversity Web: Velella
• "Billions of Blue Jelly Fish Wash Up on American Beaches". National Geographic Society. April 20, 2015.^{[dead link‍]}
• Jellieszone.com: Velella
• Marine Life Information Network
• "Millions of jelly creatures land". BBC News. November 27, 2006.
• Plankton Chronicles Short documentary films and photos