Penetration and Development of Allassogonoporus vespertilionis and Acanthatrium oregonense (Trematoda: Lecithodendriidae) Cercariae in Caddis Fly Larvae

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Abstract
The process of penetra-tion of caddis fly larvae by the cercariae of Allassogonoporus vespertilionis and Acanthatrium oregonense is described. The former cercaria becomes encapsulated in its mucous secretions before entering the intermediate host wherein it soon encysts. The latter cercaria produces, a firm, spherical cyst on the cuticle of larval caddis flies. It then penetrates the insect larva and develops into a motile, unencysted meta-cercaria. This larval form is redescribed. The motile metacercaria encysts in the thoracic muscles of the caddis fly imago.