[The life cycle of Plagiorchis neomidis Brendow, 1970, digenean parasite of Neomys fodiens in the Pyrénées. Chronobiology of cercarial emergence (author's transl)].

The first host in the life cycle of Plagiorchis neomidis in the Pyrenees is the Mollusc Radix limosa var, glacialis. The cercariae encyst in the aquatic larvae of the Insect Sialis lutaria (Megaloptera). The adult parasite is found in the rectum of Neomys fodiens. The chetotaxy and the rhythm of cercarial emergence are described in detail as is the development of the metacercaria in its second intermediate host. Comparison of the life cycle of P. neomidis in the Pyrenees with that described in Germany demonstrates differences in the biology at both larval and adult stage.