Paterson W B, Desser S S, Barta J R
Department of Zoology, University of Toronto, Ontario, Canada.
J Protozool. 1988 Feb;35(1):73-80. doi: 10.1111/j.1550-7408.1988.tb04080.x.
Mature gamonts of Haemogregarina magna lie within a type of parasitophorous vacuole (Pv) apparently unique to the haemogregarines. The cytoplasm of infected erythrocytes was separated from the parasite by two Pv membranes. An additional membrane, coated on both sides with electron-dense material, closely invested the gamonts. The apical complex of the gamonts includes a conoid, two preconoidal rings, and an elaborate polar ring complex. The latter consisted of the polar ring and approximately 78 posteriorly directed, radially arranged, "tine-like" structures which fuse as they merge anteriorly into the polar ring. Freeze fracture replicas demonstrated that the pellicle of gamonts of H. magna was structurally similar to that of other apicomplexans. The closely apposed inner membranes of the pellicle formed plates which were arranged into strips along the long axis of the gamont. Calculations indicated that 13 such strips are found around the circumference of the gamonts with about six subpellicular microtubules associated with the inner surface of each strip. Gamonts of H. magna share many structural similarities with the kinetes, ookinetes, and sporokinetes of other apicomplexans. We propose that the conoid and polar ring complex are fundamental features of all apicomplexan "kinetes."
大型血簇虫的成熟配子体位于一种显然是血簇虫所特有的寄生泡（Pv）内。感染红细胞的细胞质通过两层寄生泡膜与寄生虫分隔开。另一层膜，两侧都覆盖有电子致密物质，紧密包裹着配子体。配子体的顶端复合体包括一个类锥体、两个锥体前环和一个复杂的极环复合体。后者由极环和约78个向后指向、呈放射状排列的“齿状”结构组成，这些结构在向前汇入极环时融合在一起。冷冻蚀刻复制品显示，大型血簇虫配子体的表膜在结构上与其他顶复门原虫的表膜相似。表膜紧密相邻的内膜形成了板层，这些板层沿着配子体的长轴排列成条带。计算表明，在配子体的圆周上发现有13条这样的条带，每条条带的内表面约有6条表膜下微管。大型血簇虫的配子体与其他顶复门原虫的动合子、卵动合子和子动合子有许多结构上的相似之处。我们提出，类锥体和极环复合体是所有顶复门“动合子”的基本特征。
