Abstract
The symbiotes, commensals and parasites of the giant clam Tridacna gigas (Linn.) (Mollusca:Bivalvia) are not well known. This clam is now the focus of a budding mariculture industry in Australia, so work has been initiated to determine the usual fauna associated with this host. The turbellarian, Urastoma cyprinae (Graff, 1882), was found on the surface of the gill of cultured Tridacna gigas from both Fitzroy and Orpheus Island (Great Barrier Reef). It was also found in a wild Tridacna maxima from Heron Island. This turbellarian has not previously been recorded from Australian waters or from tridacnids. It has previously been found associated with various lamellibranch molluscs, particularly the American commercial oyster, Crassostrea virginica, and free-living.
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