After a period of growth, newly shells which were similar to adults came out near side of glochidium shells, which were degenerating as shell bottom gradually.

• 稚贝经过一段时间的生长，从幼虫壳内侧长出一对新壳，形态逐渐趋向于成贝，而幼虫壳则逐渐退化为壳顶。