The cyst wall of S.gigantea was composed a primary wall and a secondary wall.The primary wall was folded into cauliflower-like protrusions,which contained tubular fibrils and dense granule.

• 巨型住肉孢子虫的包囊壁由次生壁和原囊壁组成，原囊壁形成的突起呈花椰菜样，突起内含有管状纤丝和致密颗粒。