hypostoma

The dorsal end is curved geniculately, and there are the thickened hypolappet and triangular apertural invgination at the ventral side.

利用扫描电镜观察Ｒａｓｔｒｉｔｅｓｇｕｉｚｈｏｕｅｎｓｉｓ的超微形态，胞管孤立部分直管状，中部稍膨胀，向末端收缩变小并向腹侧弯曲成小钩状，背部末端弯曲时形成膝弯，腹侧则形成加厚的下口唇和三角形的凹陷唇口窝。