Descriptions of Three New Species and New Host or Distribution Records of Five Species of the Genus Kudoa (Myxozoa: Myxosporea: Multivalvulida) in Commercial Fishes Collected from South China Sea,Acta Parasitologica

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Descriptions of Three New Species and New Host or Distribution Records of Five Species of the Genus Kudoa (Myxozoa: Myxosporea: Multivalvulida) in Commercial Fishes Collected from South China Sea
Acta Parasitologica ( IF 1.2 ) Pub Date : 2022-04-16 , DOI: 10.1007/s11686-022-00545-1
Ying-Chun Li ₁ , Ken Inoue ₂ , Jin-Yong Zhang _{3,

4} , Hiroshi Sato _{2,

5}

Affiliation

Purpose

Myxosporeans of the genera Kudoa and Unicapsula (Cnidaria: Myxozoa: Myxosporea: Multivalvulida) may be causative agents of diseases that substantially lower the commercial value of certain marine fishes; thus, species identification is important to effectively manage outbreaks and control infections.

Methods and Results

Our investigations of commercial fishes in the families Leiognathidae (three species), Ambassidae (one), Carangidae (five) and Gerreidae (one) in the South China Sea revealed new host records for Kudoa lutjanus (Ambassis martanus, and Gerres limbattus), Kudoa trachuri (Decapterus maruadsi, and Decapterus macrosoma), Kudoa uncinata (Photopectoralis bindus), and Kudoa longichorda (D. macrosoma) and new geographical distribution records for Kudoa javanensis (Alepes djedaba), K. trachuri, and K. longichorda. Moreover, three new Kudoa spp. were described based on detected specimens forming pseudocysts in trunk muscle myofibres. These included Kudoa corniculata n. sp. from Eubleekeria jonesi, and Leiognathus equulus; Kudoa hirsuta n. sp. from Trachurus japonicas, D. maruadsi, and D. macrosoma; and Kudoa parvibulvosa n. sp. from Megalaspis cordyla. To identify these species, their myxospores were morphologically and molecularly characterised based on the small and large subunits of their ribosomal RNA genes.

Conclusions

In this study, we demonstrated morphometric variations in the myxospores of various species and an atypical K. uncinata morphotype with unequal polar capsules. Hence, taxonomic identification of myxosporeans require molecular characterisation.

中文翻译：

南海捕捞商品鱼中苦瓜属(Myxozoa: Myxosporea: Multivalvulida) 5种新种及新寄主或分布记录的描述

目的

Kudoa和Unicapsula属的粘孢子虫（Cnidaria: Myxozoa: Myxosporea: Multivalvulida）可能是疾病的病原体，大大降低了某些海洋鱼类的商业价值；因此，物种鉴定对于有效管理疫情和控制感染很重要。

方法和结果

我们在南海对鲶科（三种）、鲢鱼科（一种）、鲽科（五种）和鲱鱼科（一种）的商业鱼类的调查揭示了库多亚鲆（Ambassis martanus和Gerreslimbattus）、Kudoa的新寄主记录。 trachuri ( Decapterus maruadsi和Decapterus macrosoma )、Kudoa uncinata ( Photopectoralis bindus ) 和Kudoa longichorda ( D. macrosoma ) 以及Kudoa javanensis ( Alepes djedaba )、K. trachuri和K. longichorda。此外，三个新的Kudoa spp。根据检测到的在躯干肌肉肌纤维中形成假性囊肿的标本进行了描述。这些包括Kudoacorniculata n。sp。来自Eubleekeria jonesi和Leiognathus equulus；Kudoa hirsuta n. sp。来自Trachurus japonicas、D. maruadsi和D. macrosoma ；和Kudoa parvibulvosa n。sp。来自Megalaspis cordyla。为了识别这些物种，它们的粘孢子在形态和分子上基于其核糖体 RNA 基因的大小亚基进行表征。