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Tresus capax is a marine bivalve found along the northwest coast of North America. This is a sport species, commercially harvested in British Columbia. It burrows in the mud, feeds on particles brought through long siphons that protrude from the mud, and has a life span of around fifteen years, with spawning in late winter. Unlike other members of the Tresus genus, T. capax has a fringe of tissue known as the visceral skirt, which is commonly parasitized by crabs.