The usual bipyramid-shaped parasporal bodies occur in Lepidoptera-active strains. In comparison, spherical crystals are produced by a strain that is effective against mosquitoes, whereas nontoxic strains produce irregular crystals.
一般双金字塔形伴胞体形成于鳞翅目活性株。相比较而言,球形晶体由一种对蚊子有效的菌株产生。然而,非毒性菌株产生不规则晶体。