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首页> 外文期刊>Journal of Parasitology >Morphological and molecular characterization of a new myxozoan species (Myxosporea) infecting the gall bladder of Raja clavata (Chondrichthyes), from the Portuguese Atlantic coast.
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Morphological and molecular characterization of a new myxozoan species (Myxosporea) infecting the gall bladder of Raja clavata (Chondrichthyes), from the Portuguese Atlantic coast.

机译：一种新的黏附动物物种（Myxosporea）的形态和分子特征，感染了葡萄牙大西洋沿岸的Raja clavata（Chondrichthyes）的胆囊。

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摘要

Microscopic and molecular procedures are used to describe a new myxosporean species, Chloromyxum clavatum n. sp., infecting the cartilaginous fish Raja clavata Linnaeus, 1758 (Chondrichthyes: Rajidae), collected from the northwest Atlantic coast of Portugal. Young plasmodia and mature spores were found floating free in the gall bladder of R. clavata. Spores were spherical to subspherical with a pointed anterior end, measuring 14.4+or-0.5 micro m (n=25) in length, 11.9+or-0.5 micro m (n=25) in width, and 9.4+or-0.5 micro m (n=15) in thickness. The spore's wall was composed of 2 equally sized valves, each displaying 6-8 elevated surface ridges and a bundle of several tapering caudal filaments attached to the basal portion. Spores contained 4 pyriform equally sized polar capsules (5.5+or-0.4 micro m x2.9+or-0.5 micro m) (n=25), each possessing an obliquely arranged isofilar polar filament coiled in 7-8 coils. Morphological data, host specificity, tissue tropism, and molecular analysis of the SSU rDNA gene identify this parasite as a new species of Chloromyxum. Neighbor-joining and maximum likelihood further reveal the parasite clustering with other species of Chloromyxum infecting the gall bladder of marine cartilaginous fish to form a clade positioned at the base of the freshwater clade, therefore constituting an exception to the major division of the class Myxosporea into the freshwater and marine clades, while supporting the existence of a correlation between tissue tropism and myxosporean phylogeny.
机译：显微镜和分子程序用于描述新的粘孢子菌物种，Chloromyxum clavatum n。 sp。，感染了从葡萄牙西北大西洋沿岸采集的软骨鱼Raja clavata Linnaeus，1758年（Chondrichthyes：Rajidae）。发现年轻的疟原虫和成熟的孢子自由漂浮在R. clavata的胆囊中。孢子呈球形到亚球形，前端尖，长度为14.4+或-0.5微米（n = 25），宽度为11.9+或-0.5微米（n = 25），宽度为9.4+或-0.5微米（n = 15）的厚度。孢子壁由2个大小相等的瓣膜组成，每个瓣膜均显示6-8个升高的表面脊和一束连接在基部上的几根渐细的尾丝。孢子包含4个等长的梨状的极性囊（5.5+或-0.4微米×2.9 +或-0.5微米）（n = 25），每个囊都具有倾斜排列的等丝极性极丝，该极丝缠绕成7-8个线圈。 SSU rDNA基因的形态学数据，宿主特异性，组织嗜性和分子分析确定该寄生虫为新的含氧菌。邻域连接和最大可能性进一步揭示了寄生虫与其他腐霉菌的聚集，感染了海洋软骨鱼的胆囊，形成了位于淡水进化枝底部的进化枝，因此构成了将粘孢子虫主要分为淡水和海洋进化枝，同时支持组织嗜性与粘孢子系统发育之间的相关性。

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