Myxobolus liuyangensis sp. n. (Myxosporea: Myxobolidae) from the gills of exotic mrigal carp Cirrhinus mrigala (Actinopterygii: Cyprinidae) in China.

IF 1 4区医学 Q4 PARASITOLOGY Systematic Parasitology Pub Date : 2024-10-22 DOI:10.1007/s11230-024-10191-y

Shen Yuan, Xiaojing Zhao, Xiancheng Song, Cheng Chen, Qiang Wei, Deliang Li, Jinping Wang, Xinhua Liu

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Abstract

A new species, Myxobolus liuyangensis sp. n., was found in the gills of the exotic mrigal carp Cirrhinus mrigala during a survey of the fauna of exotic fish myxospore in China. Plasmodia were elongated pyriform, measuring 0.42 mm long and 0.15 mm wide. The mature spores were elongated pyriform in the frontal view, tapered forward, rounded posterior end, and fusiform in the sutural view, measuring 17.3 ±0.5 (16.5-18.3) μm long, 6.2 ±0.3 (5.2-6.8) μm wide, and 4.8 ±0.2 (4.4-5.1) μm thick. The two equal polar capsules of elongated pyriform in shape measured 11.3 ±0.5 (10.6-12.3) μm long and 2.5 ±0.3 (2.0-3.1) μm wide, occupying more than half the capacity of the spores. The polar filaments were coiled with fifteen to sixteen turns. No mucous envelope and caudal appendages were found. The consensus SSU rDNA gene sequence obtained here for M. liuyangensis sp. n. did not match any sequences available in GenBank, but was most closely related to M. catlae that infects the gills of C. cirrhosis (MT003664, 97.99% similarity). Phylogenetic analysis indicated that the C. mrigala-infecting Myxobolus species were not clustered together, but dispersed in different clades. The present species clustered with M. catlae and M. orissae within the clade I of elongated pyriform spore shapes, revealing spore shapes may play an important role during the evolution of Myxobolus species. This is the second myxosporean infection report in the exotic mrigal carp C. mrigala.

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中国外来鲤鱼鳃中的浏阳蕈蚊（Myxobolus liuyangensis sp.

在中国外来鱼类肌孢子群调查中，在外来鲤鱼的鳃中发现了一个新物种--浏阳肌孢子虫（Myxobolus liuyangensis sp.质体呈拉长的梨形，长 0.42 毫米，宽 0.15 毫米。成熟孢子正面看呈拉长的梨形，向前变细，后端变圆，缝合面看呈纺锤形，长 17.3 ±0.5 （16.5-18.3）微米，宽 6.2 ±0.3 （5.2-6.8）微米，厚 4.8 ±0.2 （4.4-5.1）微米。两个等长的极囊呈拉长的梨形，长 11.3 ±0.5 (10.6-12.3) μm，宽 2.5 ±0.3 (2.0-3.1) μm，占孢子容量的一半以上。极丝盘绕 15 至 16 圈。未发现粘液包膜和尾部附属物。在此获得的浏阳蝉孢子虫 SSU rDNA 基因序列与 GenBank 中的任何序列都不匹配，但与感染肝硬化鳃的 M. catlae 关系最为密切（MT003664，相似度为 97.99%）。系统进化分析表明，感染 C. mrigala 的 Myxobolus 物种并不聚集在一起，而是分散在不同的支系中。本物种与M. catlae和M. orissae聚类在长梨形孢子形状的支系I中，揭示了孢子形状在Myxobolus物种进化过程中可能起着重要作用。这是在外来鲤鱼C. mrigala中发现的第二例肌孢子虫感染报告。

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来源期刊

Systematic Parasitology 医学-寄生虫学

CiteScore

2.20

自引率

23.10%

发文量

审稿时长

6-12 weeks

期刊介绍： Systematic Parasitology publishes papers on the systematics, taxonomy and nomenclature of the following groups: Nematoda (including plant-parasitic), Monogenea, Digenea, Cestoda, Acanthocephala, Aspidogastrea, Cestodaria, Arthropoda (parasitic copepods, hymenopterans, mites, ticks, etc.), Protozoa (parasitic groups), and parasitic genera in other groups, such as Mollusca, Turbelleria, etc. Systematic Parasitology publishes fully illustrated research papers, brief communications, and fully illustrated major revisions. In order to maintain high standards, all contributors describing new taxa are asked to state clearly where the holotype is deposited and to make paratypes available for examination by the referees. It is recognized that, in some cases, this may cause problems for the authors, but it is hoped that by adhering to this rule authors may be protected against rapid synonymy of their taxa, and the types will be preserved for posterity.