The structure of the ctenidium, labial pulp and digestive organ of the Black-winged pearl oyster, Pteria penguin, was examined with corrosion casts and histological sections. The casts were made using the prepolymerization methyl methacrylate (MercoxCL-2R) containing 10 % Mercox MA. The food groove was formed by the ordinary filaments with the extended and deformed tip, and the primary filaments was connected at the food groove in the center of the supra-branchial chamber side. The interlaminar connecting membrane connected the outer lamina to the inner laminae at the primary filament with the Heterorhabdic filibranch type, but did not join the inter-laminar connecting vessels. The ciliary disk attached each ordinary filament, and the ordinary and primary filaments were composed of collagen fiber. The frontal surfaces of the ordinary filament and the primary filament were covered with the cilium. The inner surfaces of labial pulp, stomach, duct of digestive diverticula and intestine were also covered with the cilium.
Black-winged pearl oyster
corrosion cast
ctenidium
digestive organ
histology
labial pulp