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Physical Characteristics
Two hinged shells closed by powerful adductor muscles; no head; no radula; filter feeds using ciliated gills
Organs
Open circulatory system and separate sexes
Siphon
Tube through which water enters (incurrent) and exits (excurrent) the mantle cavity
Hinge Ligament
Holds the two shell valves together
Byssal Threads
Protein fibers secreted by mussels to attach to surfaces
Veliger
Larval stage of bivalves (trochophore → veliger)