Rose-coloured Barnacle, Tesseropora rosea
A tall, conical barnacle, normally white in colour, but when eroded has a pink tinge. There are four main wall plates, but the opening (orifice) is five-sided (pentagonal) in shape. Inside the plates is porous, broken by radial walls.
Young rose-coloured barnacles are grey to white in colour, with a pinkish colour at the shell plate tips. Older individuals may be more eroded, showing more pink colour.
Occurs from New South Wales, to north-eastern Victoria. Occasionally in north-eastern Tasmania. Restricted to south-eastern Australia.
Occurs at mid to high-tide levels on exposed coasts where the wave action is moderate to strong. Often found on the outer side of the rock face fully exposed to the raging surf. It is never found in estuaries, or on wood. It may be found with the Surf Barnacle, Catomerus polymerus.
When the waves are swashing across it, the Rose-coloured Barnacle spreads its feeding arms (cirri) like a net as the wave rushes back from the shore, trapping small zooplankton for food. This barnacle often occurs in very exposed situations, and can resist being desiccated by the sun for long periods of time, sometimes weeks.
Bennett, I. (1987) W.J. Dakin's classic study: Australian Seashores. p.246, Angus & Robertson, Sydney.
Davey, K. (1998) A Photographic Guide to Seashore Life of Australia. p.42, New Holland, Sydney.
Edgar, G.J. (1997) Australian Marine Life: the plants and animals of temperate waters. p.174, Reed Books, Kew.
Marine Research Group of Victoria (1984) Coastal Invertebrates of Victoria: an atlas of selected species. p.106, Museum of Victoria, Melbourne.
Underwood, A.J. & Chapman, M.G. (1993) Seashores: a beachcomber's guide. p.36, New South Wales University Press, Sydney.