title: [2 trichostrongyloid nematodes parasites of an African murid. II. Chronology of cycles and description of larval and immature stages].
abstract: Larval and immature forms in Neoheligmonella dossoi and N. tranieri (Nippostrongylinae) coparasites of Uranomys ruddi from Africa are described. The free larval stages of both species cannot be distinguished one from the other. L1, L2 and L3 are identified by their size and by shape and tail length. In the parasitic larval stages the males are distinguished from females as from the second day after infestation: the female genital primordium is displaced to the caudal extremity in a very significant way. The L4 can be separated from L3 by the presence of a cephalic vesicle and a synlophe; the immature specimens from L4 due to the presence of a new cephalic vesicle and the synlophe of adult. A specific name can be given to those larvae from day 3 after the infestation: plotting the length of the genital primordium in relation to total body length shows two distinct clouds representing a large and a small species. Similar clouds were obtained for day 4 to 7 post-infection. By day 6, the immature forms of the small species can be identified by the synlophe as dossoi and those of the large species as tranieri. The larval development of N. dossoi is slower than that of N. tranieri.
mesh_terms: D000349:Africa; D000818:Animals; D005260:Female; D007814:Larva / Q000033:anatomy & histology; D008297:Male; D009115:Muridae / Q000469:parasitology*; D013997:Time Factors; D014251:Trichostrongyloidea / Q000033:anatomy & histology / Q000254:growth & development*
vernacular_title: Sur deux nématodes trichostrongyloïdes parasites d'un muridé Africain. II--Chronologie des cycles, description des stades larvaires et des immatures.