Quatre nouvelles espèces de Capillaria (Nematoda, Capillariinae) parasites de Chiroptères du Gabon

Four new species of Capillaria, parasites of microchiropterans, are described from Gabon. Three species share: two latero-caudal alae, a membranous caudal bursa and a non-spiny cirrus in the male; presence of a vulvar appendage and eggs with smooth surfaces in the female. Capillaria landauae n. sp. is found in the intestines and stomach of Rhinolophus silvestris. The male has a thin, transversally straited spicule 650 {\`ım in length, and a small membranous caudal bursa which surrounds two forked protrusions; the female has an ovary provided with a posterior fibrous expansion and a small median bacillary band in addition to the two usual lateral bands. C. brosseti n. sp. is found in the intestines of Rhinolophus landeri. The male has a non-sclerified, almost invisible spicule 300 {\`ım in length, a cloaca with a powerful internal cuticle, and a large caudal membranous bursa which surrounds two massive protrusions each of which bears three papillae. C. gabonensis n. sp., found in the intestines of R. landeri, is similar to C. brosseti but is distinguished by the shape of stichocytes and the egg dimensions. A fourth species, C. magnova n. sp., is found in the stomach of Miniopterus inflatus, and is described only from females. This species also has a vulvar appendage and it is distinguished from the three above species by its eggs, which have greater dimensions and bear polar striations. The existence of non-sclerified spicules in C. brosseti and C. gabonensis (probably also found in other species) and which are only visible with a microscope equipped with Nomarski interference contrast is considered to be an argument against the validity of the genus Skrjabinocapillaria Skarbilovitsch, 1946.