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purple sail
Purple sails (Velella) stranded on a beach in Corsica.
purple sail
cnidarian
Also known as: Velella, by-the-wind sailor
- Also called:
- By-the-wind Sailor
- Related Topics:
- Siphonophora
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purple sail, (genus Velella), any of a genus of floating marine animals usually classified in the order Siphonophora (class Hydrozoa) and characterized by a saillike pneumatophore, or gas-filled float. Below the sail hang various structures: tentacles armed with nematocysts, or stinging cells; gonozooids, which have a reproductive function; and a single, central gastrozooid, the feeding and digesting organ.