purple sail

purple sail

also called  By-the-wind Sailor 

      (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.

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Universalium. 2010.

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