Rangel Luis Filipe, Azevedo Carlos, Casal Graça, Santos Maria João
CIMAR-Laboratório Associado, CIIMAR-Centro Interdisciplinar de Investigação Marinha e Ambiental, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, s/n FC4, 4169-007 Porto, Portugal.
J Parasitol. 2012 Jun;98(3):513-9. doi: 10.1645/GE-3005.1. Epub 2012 Jan 20.
The ultrastructure of the spores and developmental stages of Ellipsomyxa mugilis in Nereis diversicolor were studied by transmission electron microscopy. The ultrastructure features and the developmental stages show many similarities with the general pattern described for other actinospores. However, several new features are definitely worth noting. For example, tetranucleated cells precede the formation of the initial pansporocyst, which preserves the 2 original enveloping cells until the end of sporogony. In the initial stages of sporogony, the future sporoplasm cell acquires the first secondary cell by an engulfment process. In the final stage of sporogony, spores are formed by a sporoplasm with 2 secondary cells and 1 somatic nucleus, and the polar capsule has a polar filament with a helicoidal arrangement possessing 7-8 coils.
利用透射电子显微镜研究了多毛纲沙蚕体内鳗鲡椭圆黏液虫孢子及发育阶段的超微结构。其超微结构特征和发育阶段与其他放射孢子虫所描述的一般模式有许多相似之处。然而，有几个新特征绝对值得注意。例如，四核细胞先于初始泛孢子囊的形成，初始泛孢子囊在孢子发生结束前保留2个原始包被细胞。在孢子发生的初始阶段，未来的孢子质细胞通过吞噬过程获得第一个次生细胞。在孢子发生的最后阶段，孢子由含有2个次生细胞和1个体细胞核的孢子质形成，极囊有一条呈螺旋状排列、具7 - 8个螺旋圈的极丝。
