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。
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