In bivalves, the muscle that keeps their shells shut.
The muscle that holds an oyster shell closed. When the muscle relaxes, the shell opens. The abductor muscle causes a prominent scar on the inside of the oyster shell.
A prominent organ situated in the posterior region of the oyster body, consisting of an anterior translucent part and a smaller, white crescent-shaped region. It functions to close the oyster shells (relaxation of the adductor muscle allows the shells to gape open). !-- assign table width based on how this page is called close_it();