[Investigations on the oncomiracidium of Capsalidae (Monogenea) (author's transl)]

A detailed study of the ciliated cells and chetotaxy of the larva of Benedenia monticelli (Parona y Perugia, 1895) parasite of Mugil cephalus L. is carried out. Observations on the oncomiracidium of Trochopus pini (Van Beneden and Hesse, 1863) and Entobdella soleae (Van Beneden and Hesse, 1863) reveal a common plan of these structures among those Capsalidae. The pattern is different from that observed in the Dactylogyroïdea on one hand and Polyopisthocotylea on the other hand. The chetotaxic type of Capsaloïdea is original and it could, perhaps, be more advanced ontogenetic scheme as are the haptoral sclerites and the excretory system among these Monogenea.