[The chetotaxy of the swimming larvas of the European Polystomes (Monogenea)].

The sensillae of the swimming larvae of the Mongeneans of the Polystoma genus can be classified into groups and transversal cycles. The study of three european species shows that the two generations of larvae, one of them coming from the adult, the other one from the neotenic, have the same chetotaxy, that there are very few individual differences from one larva to the next, and that closely related species can sometimes be distinguished by minor variations within a fundamental pattern.