Abstract
Summary Thelohanellus pyriformis ( Thelohan 1892) from tench (Tinca tinca) gills is redescribed using light and electron microscopy. Trophozoites in form of polysporic plasmodia develop in gill filament arteries. The plasmodia are coated with endothelial cells of the host. One of the cells is enclosed within the plasmodium and becomes greatly hypertrophic without being pervaded by the parasite. The term “contact hypertrophy” is proposed for this phenomenon, which may serve to increase the nutrient flow mediating interface between the host cells and the parasite.
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