Phylogenetic characterisation of seven Unicapsula spp. (Myxozoa: Myxosporea: Multivalvulida) from commercial fish in southern China and Japan
Phylogenetic characterisation of seven Unicapsula spp. (Myxozoa: Myxosporea: Multivalvulida) from commercial fish in southern China and Japan
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DOI：
10.1017/s0031182019001793
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发表时间：
2019-12
期刊：
影响因子：
2.4
通讯作者：
Ying-Chun Li;S. Tamemasa;Jinyong Zhang;Hiroshi Sato
中科院分区：
文献类型：
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作者：
Ying-Chun Li;S. Tamemasa;Jinyong Zhang;Hiroshi Sato
粘孢子虫属单囊虫属（Unicapsula Davis，1924）的特征是在一个三瓣粘孢子中有一个功能性极囊和两个基本极囊。单囊菌属（Unicapsula spp.）生长于肌肉纤维或海鱼的鳃、食道壁及泌尿器官。对单囊藻属的分类研究较少。包括模式种肌肉单囊。因此，在本研究中，利用7个单囊藻属的15个新分离物对该属的分类进行了探讨。（美国）muscularis、U. galeata、乌桕U. andersenae、安氏隐翅虫U.米多达湖pflugfelderi和两个新物种），这些物种于2015年11月至2019年1月在中国南方和日本收集的商业鱼类的躯干肌纤维中形成假囊。二新种三角单囊藻（Unicapsula trigona n.）sp.，和单囊孢（Unicapsula motomurai n.）sp.表现出独特的粘孢子形态（半三角形和球形粘孢子，分别）和18S和28S rDNA序列，是不同于其他单囊属spp. 18S和28S rDNA序列的系统发育分析证实了单囊藻属的单系地位。
Abstract The myxozoan genus Unicapsula Davis, 1924 (Myxosporea: Multivalvulida: Trilosporidae) is characterized as having one functional polar capsule (PC) and two rudimentary PCs in a three-valved myxospore. The plasmodia of Unicapsula spp. grow either in the myofibres or in the gills, oesophageal walls and urinary organs of marine fish. Few studies have investigated the taxonomy of Unicapsula spp. including the type species Unicapsula muscularis. Accordingly, the taxonomy of the genus was explored in the present study by using 15 new isolates of seven Unicapsula spp. (U. muscularis, U. galeata, U. andersenae, U. pyramidata, U. pflugfelderi, and two new species) that had formed pseudocysts in the trunk myofibres of commercial fish collected in southern China and Japan from November 2015 to January 2019. Two new species Unicapsula trigona n. sp., and Unicapsula motomurai n. sp. exhibited unique myxospore morphologies (semi-triangular and spherical myxospores, respectively) and 18S and 28S rDNA sequences that were distinct from those of the other Unicapsula spp. Phylogenetic analysis of the 18S and 28S rDNA sequences confirmed the monophyletic status of Unicapsula.