Abstract
The three tetraphyllidean cestodes Acanthobothrium quadripartitum, Phyllobothrium piriei and Echeneibothrium sp. occur in most parts of the spiral intestine of R. naevus with peak infections in tiers 2 and 3, Echinobothrium harfordi (Diphyllidea) is restricted to anterior tiers, and Grillotia erinaceus (Trypanorhyncha) shows litlle attachment site specificity. Details of the distribution patterns can be correlated with the dorsoventral orientation of the gut in the body cavity, the internal anatomy of the spiral intestine and associated pathways of food movement, the surface topography of the mucosa, acidity, sugar gradients and intraspecific effects at high intensities of infection. The distribution of the larger (‘mature’) cestodes does not depend on the settling pattern of the larvae.
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