Cleidothaeridae: Cleidothaerus albidus (Lamarck, 1819) (‘white rock-clam’)

Synonym(s): albidus Lamarck, 1819 chamoides Stutchbury, 1830.

Typical shell-length 75 mm. One valve is flattened, the other inflated. Lives subtidally attached to rocks and shells by its right valve, in exposed environments. Native. Occurs in southeastern Australia (NSW, TAS, VIC and SA); also New Zealand. In Tasmanian waters, this is a widespread species, but not commonly beached.