Mariscal R N, Bigger C H, McLean R B
Cell Tissue Res. 1976 May 26;168(4):465-74. doi: 10.1007/BF00215997.
The commonest intracellular organelle characteristic of the Phylum Cnidaria or Coelenterata (Subclass Zoantharia) is the spirocyst. Based on scanning and transmission electron microscopy of the tentacles of sea anemones and corals, it appears that the tip of the spirocyst is either exposed to the environment or covered by a thin plasma membrane and often has a pebbled or knobby appearance. Surrounding the spirocyst tip is a ring-like structure which seems to be formed by the junction of the enclosing cell (the spirocyte) and the tip of the spirocyst. The spirocyst thread is continuous with the capsule wall and emerges from within the apical ring during discharge. No ciliary structures appear to be associated with spirocysts. Instead, two different types of microvilli have been found: short microvilli on the spirocyte itself and long microvilli furnished by the cell or cells surrounding the spirocyte. The significance of these findings is discussed in relation to the reception of stimuli for spirocyst discharge.
刺胞动物门或腔肠动物门（珊瑚虫亚纲）最常见的细胞内细胞器是刺丝囊。基于对海葵和珊瑚触手的扫描电子显微镜和透射电子显微镜观察，刺丝囊的尖端似乎要么暴露于环境中，要么被一层薄的质膜覆盖，且通常具有卵石状或瘤状外观。围绕刺丝囊尖端的是一个环状结构，它似乎是由包围细胞（刺丝囊细胞）与刺丝囊尖端的连接处形成的。刺丝囊丝与囊壁相连，并在排出过程中从顶端环内伸出。似乎没有纤毛结构与刺丝囊相关联。相反，发现了两种不同类型的微绒毛：刺丝囊细胞自身上的短微绒毛以及由围绕刺丝囊细胞的一个或多个细胞提供的长微绒毛。结合刺丝囊排出的刺激接收情况对这些发现的意义进行了讨论。
