| 翻訳と辞書 |
| Raillietina tetragona ： ウィキペディア英語版 |
Raillietina tetragona
''Raillietina tetragona'' (synonym ''Taenia tetragona'' Molin) is a parasitic tapeworm belonging to the class Cestoda. It is a cosmopolitan helminth of the small intestine of pigeon, chicken and guinea fowl, and is found throughout the world.
It is a very typical of cestode with striking resemblance to other species of ''Raillietina''. Its identifying features are, therefore, mainly on the neck and scolex structures. In addition, it is relatively large, and requires ant as intermediate host to complete its life cycle.
==Description==
''R. tetragona'' is the largest among avian tapeworms, measuring up to 30 cm in length and 1-1.5 cm in breadth. It is whitish in colour, highly elongated, dorso-ventrally flattened, and entirely covered with a tegument. The body is divisible into the head region called 'scolex', followed by an unsegmented 'neck', and then by highly segmented body proper called strobila. The strobila is composed of a series of ribbon-like body segments called proglottids, gradually enlarging from the anterior end towards the posterior. The scolex bears an apical rounded rostellum, which is armed with 100 minute hooks, arranged in single row. This is surrounded by four suckers which are lined with 5-6 rows of spines. The most important diagnostic characters in comparison to other species are oval scolex and suckers, with relatively elongated neck.
''R. tetragona'' is strictly hermaphroditic having a complete reproductive system in itself. Each mature proglottid has a set of male and female reproductive organ and genital pores on one side. Testes are located on both sides of the ovary and behind vitellarium. Each egg capsule contained 4-12 eggs and many calcareous corpuscles, each of which is surrounded by a membrane. The male reproductive system matures first. As the two reproductive systems matured, the proglottids became gravid after fertilization.〔
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「Raillietina tetragona」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.
|
|