Biomineralization begins as the mollusk secretes calcium carbonate and proteins to form the shell matrix.
Continuous deposition of mineral layers and protein matrices creates the shell structure.
Final shell development with specialized structures and enhanced mineralization.
Size Range: 1-10mm
Usually found in shallow reef areas and seagrass beds
Smallest known shell: Ammonicera minortalis (0.32mm)
Size Range: 10-50mm
Common in coral reefs and sandy bottom areas
Average size for most collected specimens
Size Range: 50-200mm+
Typically found in deeper waters and reef slopes
Largest known shell: Tridacna gigas (1.3m)