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Quagga Mussels on a marina support structure, now above the waterline (3 of 3)

Dreissena rostriformis, an invasive species. The brown threadlike masses on these dead mussels are byssi or byssal threads, used for attachment to a surface. Hemenway Harbor, Lake Mead, Nevada. 30 Dec 2009. (1836)

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Taken on December 30, 2009