Ultrastructural Observations on the Reserve Bladder System of Cyathocotyle bushiensis Khan, 1962 (Trematoda: Strigeoidea) with Special Reference to Lipid Excretion

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Abstract
The reserve bladder system of Cyathocotyle bushiensis (Trematoda Strigeoidea) consists of a series of lacunae extending over the dorsal and lateral regions of the body. The lacunar wall is composed of a layer of cytoplasm containing nuclei, mitochondria, and ribosomes. The wall possesses an outer plasma membrane elevated to form stacks of lamellae and a basal plasma membrane demarcating the layer from other structures. In the adult (5-day) parasite the cytoplasm contains lipid droplets only, which become associated with the lamellae and are then released into the lumen of the lacuna. In the 18-hr parasite the cytoplasm and lamellae are associated with excretory corpuscles consisting of layers arranged concentrically around a central core. At 3 days, the excretory cytoplasm possesses both fat and excretory corpuscles. Histochemical tests suggest that the corpuscles contain calcium salts and the lipid droplets neutral fat. The lamellae exhibit acid and alkaline phosphatase activity.

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