Abstract
Abidi S. M. A., Ahmad M., Nizami W. A. and Hanna R. E. B. 1988. Clinostomum complanatum: tegumental surface changes during in vivo development. International Journal for Parasitology 18: 433–439. Scanning electron microscopy of the tegumental surface of progenetic metacercariae and adult Clinostomum complanatum revealed considerable differences in topography and texture. The metacercarial tegument is characterized by the presence of folds, ridges and furrows, and surface annulations. The lamellar network, which imparts a ‘mosaic’ appearance to the lateral body surface, surrounds sensory papillae and tegumental spines. Dome-shaped and cup-like papillae are present. During in vivo development towards the ovigerous stage tegumental changes occur which disrupt most of the normal surface structures. These changes are consistent with disruption of the surface syncytium accompanied by erosion in certain regions. Numerous ‘cobble-stone’ like and dome-shaped protrusions appear around the acetabulum, gonopore and on the ventral body surface. The body surface appears granular, possibly due to secretory activity of the tegument in response to host immune reactions.
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