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首页> 外文期刊>Parasitology >Cucumispora dikerogammari n. gen. (Fungi: Microsporidia) infecting the invasive amphipod Dikerogammarus villosus: a potential emerging disease in European rivers.
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Cucumispora dikerogammari n. gen. (Fungi: Microsporidia) infecting the invasive amphipod Dikerogammarus villosus: a potential emerging disease in European rivers.

机译：黄瓜（Cucumispora dikerogammari）。 gen。 （真菌：微孢子虫病）感染入侵性两栖类双枝D（Dikerogammarus villosus）：欧洲河流中潜在的新兴疾病。

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摘要

Dikerogammarus villosus is an invasive amphipod that recently colonized the main rivers of Central and Western Europe. Two frequent microsporidian parasites were previously detected in this species, but their taxonomic status was unclear. Here we present ultrastructural and molecular data indicating that these two parasites are in fact a single microsporidian species. This parasite shares numerous characteristics of Nosema spp. It forms elongate spores (cucumiform), developing in direct contact with host cell cytoplasm; all developmental stages are diplokaryotic and the life cycle is monomorphic with disporoblastic sporogony. Initially this parasite was described as Nosema dikerogammari Ovcharenko and Kurandina 1987. However, phylogenetic analysis based on the complete sequence of SSU rDNA places the parasite outside the genus Nosema and it is therefore ascribed to a new genus Cucumispora. The key features characteristic to this genus are: presence of a very well-developed, umbrella-shape anchoring disk covering the anterior part of polaroplast; arrangement of isofilar polar filament into 6-8 coils convoluted with different angles, voluminous diplokaryon, thin spore wall and relatively small posterior vacuole containing posterosome. The parasite infects most host tissues but mainly muscles. It showed high rates of horizontal trophic transmission and lower rates of vertical transmission.
机译：Dikerogammarus villosus是一种侵入性的两栖动物，最近在中欧和西欧的主要河流定居。以前在该物种中检测到两种常见的小孢子虫寄生虫，但它们的分类状态尚不清楚。在这里，我们介绍了超微结构和分子数据，表明这两个寄生虫实际上是单个微孢子虫物种。此寄生虫具有Nosema spp的许多特征。它形成细长的孢子（黄瓜形），直接与宿主细胞的细胞质接触形成。所有的发育阶段都是双核的，生命周期是单核的，具成珠状孢子形成。最初将此寄生虫描述为Nosema dikerogammari Ovcharenko和Kurandina1987。但是，基于SSU rDNA完整序列的系统发育分析将寄生虫置于Nosema属之外，因此将其归因于新的Cucumispora属。该属的主要特征是：存在一个非常发达的伞形锚定盘，覆盖了原生质体的前部;将等丝极丝排列成6-8个盘绕，盘绕成不同的角度，大量双梁，孢子壁薄，含有后囊的相对较小的后液泡。寄生虫感染大多数宿主组织，但主要感染肌肉。它显示出较高的水平营养传输速率和较低的垂直传输速率。

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