On the structure of Ascaridia galli, the roundworm of domestic fowl
نویسنده
چکیده
Ascaridia galli Schrank is by far the most notorious nematode parasite of birds including poultry fowls in terms of prevalence and pathogenicity. In spite o f its immense impact on poultry industry and wildlife management, information on its detail morphological and anatomical structures is scanty. Scanning electron microscopy revealed that the extreme anterior cephalic region is a triangular mouth consisting of three prominent lips. Each lip is lined with fine teeth on the internal rim, and externally studded wi th eye-like sensory papillae. The body cuticle constituted series of stria tions called annulations. Annuli are trans verse concentric rings and were divided further into parallel subannuli. Female had a simple straight tail with a ventrally located anal opening. The male posterior was curved and pointed, and relatively elaborate having a precloacal sucker in addi tion to the anus. These posterior openings were surrounded on both sides by a row of minute protrusions called caudal papillae and the la teral caudal alae. The precloacal sucker was surrounded by a sclerotized ring. Light microscopy showed that the cuticle was multilayered and continuous with the hypodermis, which in turn was supported wi th a thick musculature composed of fibrillar contractile and granular noncontractile protoplasmic portions. The body space, pseudocoel, contained digestive tract and reproductive organs such as testis, vas deferens and seminal vesicle in male, and ovaries, oviducts and uteri in female. The seminal vesicle housed spermatozoa, and the uteri, fertili zed eggs. The eggs were elliptical, covered with chitinous shell that enclosed the embryo.
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تاریخ انتشار 2010