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I noticed a large 3x3cm mass adjacent to the incurrent siphon of one of my large(~10") derasa. The clam is wild harvested and otherwise healthy. It did have parasitic snails on arrival 2 months ago which were removed. These large clams have somewhat recessed viscera in comparison to my other smaller clams. This mass is definately not byssal gland or adductor muscle which can be seen further posterior when looking thru the siphon. It is smooth. No evidence of boring sponge or algae. Any thoughts? Adam