title: [Spermiogenesis and the function of the vaginal sac in Ichthyocephalus anadenoboli. n. sp. (Rhigonematidae; Nematoda), a parasite of Anadenobolus politus (Porat) (Rhinocricidae; Diplopoda) in Guadeloupe].
abstract: Ichthyocephalus anadenoboli n. sp. ( Rhigonematidae ; Nematoda) from Anadenobolus politus ( Porat ) ( Rhinocricidae ; Diplopoda ) from Guadeloupe is described. The new species most closely resembles I. egleri since both sexes are of approximately the same size and the spicules are markedly unequal; it is distinguished in having a much longer right spicule, by the form of the extremity of the left spicule and by the presence of a vaginal sac opening into the vagina at its junction with the uteri. In addition certain aspects of spermiogenesis in the new species are studied. Maturation of spermatids occurs in two phases, one in the testis and seminal receptacle of males, the second in the vaginal sac in females. The second phase involves profound changes in form as well as nuclear transformation. It is suggested that the vaginal sac observed in certain species of Rhigonema as well as the " bourse copulatrice " of certain Tetrameres spp. and Maupasina weissi , like that of Ichthyocephalus anadenoboli , are specialized to accommodate the final stages of spermiogenesis.
mesh_terms: D000818:Animals; D001181:Arthropods / Q000469:parasitology; D005260:Female; D008297:Male; D009348:Nematoda / Q000033:anatomy & histology / Q000502:physiology*; D013091:Spermatogenesis; D014621:Vagina / Q000502:physiology; D014900:West Indies
vernacular_title: Spermiogénèse et fonction du sac vaginal chez Ichthyocephalus anadenoboli n. sp. (Rhigonematidae; Nematoda), parasite d'Anadenobolu s politus (Porat) (Rhinocricidae; Diplopoda) en Guadeloupe.