Something different on Lahinch beach today.
Velella is a genus of free-floating
Hydrozoans that lives on the surface of the open ocean, worldwide, and is commonly known by the names
by-the-wind sailor,
purple sail,
little sail, or simply
Velella. The most common, and perhaps the only species encountered is
Velella velella.
These small
cnidarians are part of a specialised ocean surface community that includes the cnidarian
siphonophore Portuguese Man o' War and some specialised molluscan
nudibranchs (
sea slugs), including
Glaucus and the purple snails
Janthina, that prey on them. Each
Velella 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 can become stranded on beaches in the thousands.