| 翻訳と辞書 |
| Ascaridia galli ： ウィキペディア英語版 |
Ascaridia galli
''Ascaridia galli'' is a parasitic roundworm belonging to the phylum Nematoda. Nematodes of the genus ''Ascaridia'' are essentially intestinal parasites of birds.〔Yamaguti, S.(1961). ''Systema Helminthum. 3. The nematodes of vertebrates''. Interscience Publishers, New York and London, pp. 1261.〕 ''A. galli'' is the most prevalent and pathogenic species, especially in domestic fowl, ''Gallus domesticus'' Linnaeus, 1758. It causes ascaridiasis, a disease of poultry due to heavy worm infection, particularly in chicken and turkeys. It inhabits the small intestine, and can be occasionally seen in commercial eggs.〔Griffiths HJ (1978). ''A Handbook of Veterinary Parasitology: Domestic Animals of North America''. University of Minnesota Press, Minneapolis, Minnesota, USA, pp. 46-47.〕
==Description==
It is the largest nematode in birds. The body is semitransparent, creamy-white and cylindrical. The anterior end is characterized by a prominent mouth, which is surrounded by three large tri-lobed lips. The edges of the lips bear teeth-like denticles. The body is entirely covered with a thick proteinaceous structure called cuticle. The cuticle is striated transversely throughout the length of the body and cuticular alae are poorly developed. Two conspicuous papillae are situated on the dorsal lip and one on each of the subventral lips. These papillae are the sensory organs of the nematode. ''A. galli'' is diecious with distinct sexual dimorphism. Females are considerably longer and more robust, with vulva opening at the middle portion (approximately midway from anterior and posterior ends) of the body and anus at the posterior end of the body. The tail end of females is characteristically blunt and straight. Males are relatively shorter and smaller, with a distinct pointed and curved tail.. There are also ten pairs of caudal papillae towards the tail region of the body, and they are arranged linearly in well-defined groups such as precloacal (3 pairs), cloacal (1 pair), post-cloacal (1 pair) and subterminal (3 pairs) papillae.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Ascaridia galli」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|