Theisen Stefan, Palm Harry W, Al-Jufaili Sarah H, Kleinertz Sonja
Aquaculture and Sea-Ranching, University of Rostock, Rostock, Germany.
Centre for Studies in Animal Diseases, Udayana University, Badung Denpasar, Bali, Indonesia.
PLoS One. 2017 Sep 7;12(9):e0184376. doi: 10.1371/journal.pone.0184376. eCollection 2017.
An endoparasitic monogenean was identified for the first time from Indonesia. The oesophagus and anterior stomach of the croakers Nibea soldado (Lacépède) and Otolithes ruber (Bloch & Schneider) (n = 35 each) sampled from the South Java coast in May 2011 and Johnius amblycephalus (Bleeker) (n = 2) (all Sciaenidae) from Kedonganan fish market, South Bali coast, in November 2016, were infected with Pseudempleurosoma haywardi sp. nov. Prevalences in the first two croakers were 63% and 46%, respectively, and the two J. amblycephalus harboured three and five individuals. All three croakers represent new hosts for this monogenean genus. We provide infection rates, light microscopical observations, 3D confocal microscopical illustrations, and a morphometric comparison with all congeners. The new species differs in body size, the position and shape of the ovary and testes, and especially in the composition of the dorsal anchor complex, with the dorsal bar being anteriorly concave rather than planar or convex as in its congeners. The dorsal and ventral anchors of this new species are the longest in the genus, whereas the male copulatory organ is the smallest. The first DNA sequences for a member of this genus demonstrate the greatest similarity with endoparasitic freshwater monogeneans from African cichlid fishes. This suggests a freshwater origin for these marine endoparasitic monogeneans.
首次从印度尼西亚鉴定出一种体内寄生的单殖吸虫。2011年5月从爪哇南部海岸采集的35条黄斑白姑鱼（Lacépède）和35条红鳍笛鲷（Bloch & Schneider）（均为石首鱼科），以及2016年11月从巴厘岛南部海岸凯东纳南鱼市采集的2条钝头鮠（Bleeker）（均为石首鱼科）的食管和前胃，均感染了哈氏伪单盘虫（Pseudempleurosoma haywardi sp. nov.）。前两种石首鱼的感染率分别为63%和46%，两条钝头鮠分别寄生有3条和5条该吸虫。这三种石首鱼均为该单殖吸虫属的新宿主。我们提供了感染率、光学显微镜观察结果、三维共聚焦显微镜图像，以及与所有同属物种的形态测量比较。新物种在体型大小、卵巢和睾丸的位置及形状上存在差异，特别是在背锚复合体的组成上，其背杆前部呈凹形，而非同属其他物种那样呈平面或凸形。该新物种的背锚和腹锚是该属中最长的，而雄性交配器官是最小的。该属成员的首个DNA序列显示，其与非洲丽鱼科鱼类的体内寄生淡水单殖吸虫最为相似。这表明这些海洋体内寄生单殖吸虫起源于淡水环境。
