In present study , we found that cipangopaludina chinensis has two kinds of sperm , one is the viable typical sperm , and the other is the unviable atypical sperm 结果表明：中国圆田螺的精子具有双态现象，即既有可育的典型精子，又有不育的异型精子。
Sperm bimorphism is a common phenomenon through the animal kingdom , especially in gastropod , such as most of mesogastropod and neogastropod and some of archeogastropod 精子双态现象是动物界尤其是腹足类的一个普遍现象：原始腹足类( archegastropod )中仅少数具有双态精子，中腹足类( mesogastropod )和新腹足类( neogastropod )中大多数都具有双态精子。
