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Summary
The mantle of Pinctada maxima is covered by a single layer of epithelium with associated secretory cells. It shows regional differentiation mainly in epithelial cell height, pigmentation, ciliation, and nucleus position, and in the distribution and type of secretory cells. Such differentiation relates to variation in the function of different mantle areas, mainly in the secretion of different shell components, and corresponds closely to differentiation found in Pinctada martensii.