[Validity of the two species O. lienalis and O. gutturosa from bovines (author's transl)].

A new morphological analysis of the Onchocerca from the gastrosplenic ligament reveals characteristics confirming the validity of the species O. lienalis as distinct from the cervical Onchocerca, O. gutturosa. The dermic microfilaire of the two species have completely different distributions: the microfilariae of O. gutturosa are gathered in the cephalic region of Bovines while that of O. lienalis can be found in the umbilical region. Therefore we suspect strongly that the life cycle evolving in S. ornatum in England is that of O. lienalis and not of O. gutturosa as previously postulated; and we think that O. gutturosa is more likely to evolve in Culicoides than in Simulium.