Characteristics of the Aragonitic Layer in Adult Oyster Shells, Crassostrea gigas: Structural Study of Myostracum including the Adductor Muscle Scar

Figure 1

(a) Schematic of the inner surface of the left valve of an oyster shell, Crassostrea gigas (black dotted line: cutting plane). (b) Schematic of the vertical section with the cutting plane of the adductor muscle scar. The bottom schematic is an enlargement of the cutting plane including the AMS (adductor muscle scar), myostracum, and folia. (c) An enlargement indicating the thickness of the myostracum buried in the folia on the anterior side. The size of each layer is exaggerated for clarity. Various terms are in common use in the description of the bivalve shell [25].