Rose barnacles have a steep, conical shell with an outer wall made up of four plates.

[3]: 366  The central triangle-shaped portions of these plates are called parietes – which in this species have each a single row of large, square pores or tubes.

[2] The opened top part of the barnacle shell, which connects to the outside, is called the orifice.

[3]: 366 [2] On the continent's west coast, it is found in the Fremantle area and from Albany, where it may have been introduced through ballast water transfer.

[9]: 649  They extend and spread their cirri to feed only during periods of strong current, and thus cannot not live in calm-water areas.