A new species of Ellipsomyxa Køie, 2003 (Bivalvulida) infecting the gall bladder of Pangasius macronema Bleeker (Siluriformes: Pangasiidae) from the Mekong River Delta, Vietnam.

IF 1 4区医学 Q4 PARASITOLOGY Systematic Parasitology Pub Date : 2023-12-01 Epub Date: 2023-09-28 DOI:10.1007/s11230-023-10114-3

Steven P Ksepka, Triet N Truong, Stephen A Bullard

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Abstract

During a parasitological survey of freshwater fishes in the Mekong River Delta, Vietnam, disporic plasmodia containing myxospores morphologically consistent with Ellipsomyxa Køie, 2003 (Bivalvulida) were observed infecting the gall bladder of Pangasius macronema Bleeker (Siluriformes: Pangasiidae). Herein, we use morphology and small subunit ribosomal DNA (SSU rDNA, 18S) sequence data to describe Ellipsomyxa intravesica Ksepka & Bullard n. sp. and relate it to other myxozoans. The new species resembles Ellipsomyxa adlardi Whipps & Font, 2013, which infects the naked goby, Gobiosoma bosc (Lacepede) (Gobiiformes: Gobiidae) in Lake Pontchartrain, Louisiana, but differs from it by having a longer myxospore (mean = 13.3; range = 12.0-15.0 vs. 12.4; 11.3-14.4) and shorter polar capsules (3.7; 3.0-4.0 vs. 4.3; 3.9-4.9). The 18S phylogenetic analysis recovered the sequence of the new species sister to those ascribed to Ellipsomyxa ariusi Chandran, Zacharia, Sathianandan & Sanil, 2020 and Ellipsomyxa sp. (MK561979); both of which infect the gall bladder of the threadfin sea catfish, Arius arius (Hamilton) (Siluriformes: Ariidiae) from the southwest coast of India. Consistent with previous phylogenetic analyses of Ellipsomyxa spp., Ellipsomyxa was recovered as monophyletic. The new species is the first species of Ellipsomyxa reported from a freshwater fish in Asia and the first myxozoan reported from P. macronema.

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越南湄公河三角洲的一个新种，感染了Pangasius macronema Bleeker（志留目：Pangasidae）的胆囊。

在对越南湄公河三角洲淡水鱼类进行寄生虫学调查期间，观察到含有粘孢子的分裂胞浆体感染了Pangasius macronema Bleeker（志留目：Pangasidae）的胆囊，其形态与Ellipseomyxa Køie，2003（双壳目）一致。在此，我们使用形态学和小亚基核糖体DNA（SSU rDNA，18S）序列数据来描述膀胱内椭圆菌Ksepka&Bullard n.sp.，并将其与其他粘菌联系起来。这一新物种类似于Ellipseomyxa adlardi Whipps&Font，2013，它感染了路易斯安那州庞恰特雷恩湖的裸虾虎鱼，Gobiosoma bosc（Lacepede）（Gobiformes:Gobidae），但与之不同的是，它具有较长的粘孢子（平均值=13.3；范围=12.0-15.0 vs.12.4；11.3-14.4）和较短的极囊（3.7；3.0-4.0 vs.4.3；3.9-4.9）。18S系统发育分析将新物种姐妹的序列恢复为Ellipseomyxa ariusi Chandran、Zacharia、Sathianandan&Sanil，2020和Ellipseomy xa sp.（MK561979）；这两种病毒都感染了来自印度西南海岸的线鳍海鲶鱼Arius Arius（Hamilton）（志留目：Ariidiae）的胆囊。与以前对椭圆菌的系统发育分析一致。椭圆菌被恢复为单系。该新种是亚洲第一个从淡水鱼中报告的椭圆虫属物种，也是第一个从大条藻中报告的粘虫。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.