Abstract：
In March and April 2018, we carried out a survey of myxosporean parasites in coastal fishes collected from Nha Trang Bay in Vietnam\'s East Sea. Of the 159 fish specimens, 18 fish species were represented, belonging to 10 families. In 8 host species, 7 myxosporean species were found, representing the genera Kudoa and Unicapsula. Two of these species were new to science: Kudoa igori n. sp. from the gallbladder of Longarm mullet Osteomugil cunnesius (Valenciennes, 1836) (prevalence 10%) and Kudoa borimiri n. sp. from skeletal muscles of Longarm mullet and Longfinned mullet Osteomugil perusii (Valenciennes, 1836) (prevalence 30% and 60%, respectively). Vegetative stages were not found. Spores of K. igori n. sp. were small, orbicular to quadrate in apical view, and with four equal valves. In lateral view, spores were shallowly ovoid with a slightly protruding anterior pole. The 4 polar capsules were slightly unequal sizes and were oriented toward the apex of the spore. Dimensions were as follows: spore length 4.56 ± 0.22 (4.18-4.56), thickness 4.42 ± 0.39 (3.55-5.13), width 5.74 ± 0.46 (4.66-6.50), length of biggest polar capsule 1.38 ± 0.14 (1.1-1.65), middle 1.28 ± 0.12 (1.03-1.53), smallest 1.13 ± 0.11 (0.94-1.30), width of biggest polar capsule 1.03 ± 0.14 (0.83-1.4), middle 0.92 ± 0.12 (0.76-1.08), smallest 0.74 ± 0.12 (0.55-0.94). Spores of K. borimiri n. sp. had four equal valves with slightly rounded ends and were quadrate in apical view. In lateral view, spores were broadly deltoid. Four equal-sized polar capsules opened at the apex of the spore. In O. cunnesius, spore dimensions were as follows: length 3.51 ± 0.15 (3.34-3.92), thickness 3.65 ± 0.38 (2.79-4.21), width 4.97 ± 0.37 (4.13-5.97), length of the polar capsules 1.23 ± 0.18 (0.99-1.57), width 0.88 ± 0.07 (0.70-1.00). Overlapping dimensions for K. borimiri n. sp. spores were also found in O. perusii. Other known myxozoan species we encountered were Kudoa thyrsites and Kudoa whippsi, which had not previously been reported from the East Sea and Vietnam. We also encountered Kudoa monodactyli, which had not previously been reported from Nha Trang Bay. In addition, we report 2 additional species, a Kudoa sp. and a Unicapsula sp., that were not attributable to previously described myxozoans and need further investigation to completely characterize.
摘要：
2018年3月和4月，我们对从越南东海芽庄湾收集的沿海鱼类中的粘菌寄生虫进行了调查。在159个鱼类标本中，代表了18种鱼类，属于10个家庭。在8个寄主物种中，发现了7种黏液孢子虫，代表Kudoa属和Unicapasa属。其中两个物种是科学新物种：Kudoaigorin.sp.来自长臂鱼Osteomugilcunnesius的胆囊（Valenciennes，1836年)(患病率10%)和Kudoaborimirin.sp.来自长尾鱼和长尾鱼的骨骼肌Osteomugilperusii（Valenciennes，1836)(患病率30%和60%，分别)。未发现营养阶段。K.igorin.sp的孢子。很小，根尖视图中的圆形到方形，和四个相等的阀门。在侧视图中,孢子浅卵形，前极稍突出。4个极性胶囊的大小略有不同，并朝向孢子的顶点。尺寸如下：孢子长度4.56±0.22（4.18-4.56），厚度4.42±0.39(3.55-5.13),宽度5.74±0.46(4.66-6.50),最大极性胶囊长度1.38±0.14（1.1-1.65），中间1.28±0.12（1.03-1.53），最小的1.13±0.11（0.94-1.30），最大极性胶囊宽度1.03±0.14（0.83-1.4），中间0.92±0.12（0.76-1.08），最小0.74±0.12（0.55-0.94）。K.borimiri孢子n.sp.有四个相等的瓣膜，末端略圆，在根尖视图中呈方形。在侧视图中,孢子是广泛的三角肌。四个大小相等的极性胶囊在孢子的顶端打开。在O.cunnesius,孢子尺寸如下：长度3.51±0.15（3.34-3.92），厚度3.65±0.38(2.79-4.21),宽度4.97±0.37(4.13-5.97),极性胶囊的长度1.23±0.18（0.99-1.57），宽度0.88±0.07（0.70-1.00）。K.borimirin.sp.的重叠尺寸。在O.perusii也发现了孢子。我们遇到的其他已知的粘液虫物种是Kudoathyrsites和Kudoawhippsi，此前从未从东海和越南报道过。我们还遇到了Kudoamonodactyli，芽庄湾以前没有报道过。此外,我们报告了另外两个物种，aKudoasp.和一个Unicapsulasp.,不能归因于先前描述的粘液虫，需要进一步研究才能完全表征。
