Abstract
Dark Leathery Surface of Geoduck Clams (LSGC) is an alteration that affects the periostracum of the mantle and siphon of Panopea generosa from the northwest coast of Canada and Mexico. This alteration affects commercialization and possibly the survival of the clams. The cause of LSGC is unknown but has been correlated with presence of fungi and protozoans. We detected a similar alteration in Panopea globosa from Baja California, Mexico and the histophagous ciliate Uronema marinum was isolated from affected siphon tissue. U. marinum was identified by its morphology and by genetic analysis of the gene 18S rRNA. This is the first record of LSGC in P. globosa and the first identification of a histophagous protozoan associated with it.
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