The Australasian barnacle originates from the waters around New Zealand. It is also known by the name New Zealand barnacle. During the Second World War, it was brought unintentionally to Europe on British warships. The animal has four plates, as opposed to the acorn barnacle which has six plates. The plates resemble a symmetric cross. When the Australasian barnacle lives in the same area as the bay barnacle, it displaces the bay barnacle. Australasian barnacles breed throughout the year, although there are peaks in May and October.