Ubur-ubur layar

Pelampungnya berupa cakram lonjong pipih berwarna biru dengan panjang hingga sekitar 10 cm; di atasnya terdapat layar tipis yang biasanya digambarkan berbentuk segitiga dan terpasang miring secara diagonal, serta tentakel biru pendek menjuntai dari tepinya.

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.