Buoy Barnacle (Dosima fascicularis)
…a species of lepadid goose barnacle that boasts a cosmopolitan distribution, with a preference for temperate seas. True to its common name adult D. fascicularis will hang downwards from the water surface, held up by a float, and is carried along by currents filter feeding along the way. Larval D. fascicularis are planktonic and must attach to a float (usually flotsam) for metamorphosis into the adult form. However, the adults are eventually capable of using their own float, and are usually seen in aggregations of many individuals all using the same float.
Dosima fascicularis was formerly placed in the genus Lepas but is now placed in its own monotypic genus Dosima. Dosima is distinguished from Lepas by the exceptional brittleness of its exoskeleton and by the form of the carina.