病原立克次氏小体或立克次氏体微生物(Rickettsiella penaei),无界膜和包涵体。因发育阶段的不同,可分为原体(为个体最小的球状物,直径约0.1—0.2μm)、中间体(是原体与始体之间的过渡类型,直径为0.3—0.4μm)、始体(是由中间体发育而成的个体最大的球形体,直径0.5—0.7μm)、繁殖体(是发育成熟的个体,大部分为典型的哑铃状或棒锤状的二分裂体)。 Pathogenic rickettsiella or rickettsiella penaei, unbounded membranes and inclusion bodies. Due to different stages of development, can be divided into the original body (for the smallest ball, the diameter of about 0.1-0.2μm), intermediate (is the transition type between the original body and the starting body, the diameter of 0.3-0.4μm) The starting body (the largest spherical body of an individual developed from an intermediate, 0.5-0.7 μm in diameter), and the propagule (a well-developed individual, mostly dumbbell-shaped or hammer-like dichotomies).