Each cysticercus consists of a cyst wall and a single scolex invaginated into the lumen. 每一个囊尾蚴是由一个囊壁和陷入囊腔中的单独一个头节所组成的。
Bursa is the unique structure of the birds, is located at the top of the post-cloacal, the wall is full of lymphoid tissue. 法氏囊是鸟类特有的结构,位于泄殖腔后上方,囊壁充满淋巴组织。