title: [Nematodirinae (Nematoda) from Ruminants and from lagomorpha. (author's transl)].
abstract: Study of eight species of Nematodirinae with special emphasis on their synlophe: Nematodirus filicollis (Rudolphi, 1802), N. spathiger (Railliet, 1896). N. helvetianus May, 1920, N. battus Crofton & Thomas, 1951, N. tortuosus Tucker, 1942, Nematodirella dromedarii (May, 1920), Nematodiroides zembrae (Bernard, 1965) and Rauschia triangularis, type species of the new genus Rauschia. Furthermore, bibliographical data permit to know the structure of the synlophe in four other species. In each of these species the synlophe retains the primitive bilateral symmetry observed in the Molineidae; in species parasitic in Ruminants and Rodents, the synlophe shows non pronounced size gradient, nor a pronounced peculiar orientation of the tip of the crests. These last specialized characters are observed, on the contrary, in species parasitic in Lagomorpha. These latter show, starting from synlophes of the "Anoplostrongylinae"-type, various evolutionary essays; the most remarkable is an hypertrophy of the dorsal crests which leads at the end of the evolution, to a dextral coiling, the back of the animal being inside the spire: such a position appears unique in the superfamily. Rauschia gen. nov. (type species: R. triangularis) is created for species previously pertaining to Nematodirus parasite of Lagomorpha, and in which the synlophe, very complex, differs from the synlophe of the parasite of Ruminants. A dichotomic key of the six genera of Nematodirinae is proposed.
mesh_terms: D000818:Animals; D001188:Artiodactyla / Q000469:parasitology*; D005260:Female; D006790:Host-Parasite Interactions; D007421:Intestine, Small / Q000469:parasitology; D007793:Lagomorpha / Q000469:parasitology*; D008297:Male; D008322:Mammals / Q000469:parasitology*; D009348:Nematoda / Q000033:anatomy & histology* / Q000145:classification / Q000502:physiology; D013045:Species Specificity
vernacular_title: Les Nematodirinae (Mematoda) chez les ruminants et chez les lagomorphes.