Vélelle

Le flotteur est un disque ovale, plat et bleu, mesurant jusqu’à environ 10 cm de long, surmonté d’une fine voile, généralement décrite comme triangulaire, disposée en diagonale ; de courts tentacules bleus pendent de son bord.

The sail of Velella velella helps it drift at an angle to the wind and occurs in two opposite forms. According to the US National Park Service, left-handed forms are usually found in the Northern Hemisphere and right-handed forms in the Southern Hemisphere; this is a general pattern, not an absolute rule.