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[[File:example.jpg|thumb|150px|left|Description]] | [[File:example.jpg|thumb|150px|left|Description]] | ||
A geoduck is a large species of [[bivalve]] [[clam]]. It has a rectangular shell that can be up to 9 or 10 inches long and 5 inches high. Each of the [[valves]] are equal in size and have irregularly shaped lines that indicate growth. The geoduck’s [[ligament hinge]] connects and holds the two valves together. The shell is covered by a thin covering called the [[periostracum]]. The periostracum protects the valve's middle layer from scratches and abrasions. | |||
<ref name=mlife>[http://wikis.evergreen.edu/marinelife1011/index.php/Panopea_generosa#cite_note-2 Ever-green] ''marine-life-1011''. Web. March 7, 2011(Date-of-publication).</ref> | |||
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