Explore the Collection: Crustaceans
Triangular Barnacle (Balanus trigonus)
This species of barnacle can be distinguished by its six deep pink plates with white ribs and the presence of a triangular opening. Balanus trigonus grows to a height of 15 mm and a diameter of 20 mm, which makes it relatively small compared to other barnacle species (e.g. Megabalanus tintinnabulum).
This species is generally found in areas that are constantly underwater, unlike many other barnacles which inhabit areas that are exposed to air for a period of the day. Balanus trigonus attaches to a variety of hard surfaces (e.g. rock, wood, mollusc shells) and has been found associated with mussels and oysters, or attached to crabs and the bases of kelp.
Did you know?
Triangular Barnacles attach to hard surfaces including rocks, wood, mollusc shells and man-made structures such as boat hulls.
It is often found attached to man-made structures, including the hulls of boats, ropes and wharf pilings, and is a known ‘fouling’ species. Fouling is a major issue in shipping as organisms that attach to the hulls of ships increase the amount of drag, leading to a decrease in the vessel’s fuel efficiency.
This species of barnacle is widespread throughout Australia and overseas.
Photos of Triangular Barnacle Found in the Dampier Archipelago
Triangular Barnacle (Balanus trigonus) growing on mussels. Photograph: Doug Elford, WA Museum
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