What is another word for acorn barnacle?
Pronunciation: [ˈe͡ɪkɔːn bˈɑːnəkə͡l] (IPA) 
Acorn barnacles are marine crustaceans that attach themselves to rocks, ships and other hard surfaces using their tough, calcified shells. Synonyms for the word 'acorn barnacle' include rock barnacles, volcano barnacles, and sessile cirripedes. Rock barnacles, as the name suggests, are found typically on rocks and boulders. Volcano barnacles are small, crater-like barnacles that cover the rocky areas surrounding submarine volcanic vents whereas, sessile cirripedes are a broader classification of barnacle that are sedentary and attach themselves to a variety of surfaces. Although these synonyms are often used interchangeably, they all refer to the same group of crustaceans with a distinctive, cone-shaped shell.
