Abstract
Anomotaenia brevis (Cestoda, Cyclophyllidea) induces major changes in the morphological characters of the host ant, Leptothorax nylanderi (Hymenoptera, Formicidae): alteration of pigmentation, lowering of adult mean size, reduction of legs, eyes and head, enlargement of petiole. The presence of parasites in adult ants also modifies the quantity of cuticular compounds but not their quality. The parasite induces some changes in the synthesis/release of 13 cuticular hydrocarbons. The higher the number of parasites within a worker, the larger the quantitative changes in four cuticular hydrocarbons in comparison with normal ants. Such modifications (morphology, chemistry, behaviour) may explain the partial intolerance exerted by normal workers against the parasitized ants.
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