Velella n. : Any species of oceanic Siphonophora belonging to the genus Velella.

Example:


Taxonomy
Velella velella, hydroid, polyps, medusae, colony, Anthomedusae, sail, beaches, nematocysts, free encyclopedia, family, sailor, the colony, prey, Athecatae, Cnidaria, genus, wind conditions.

Defination from the web:
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 ... Each Velella is a hydroid colony, and most are less than about 7 cm long. ... In common with other Cnidaria, Velella are carnivorous animals. ...