Kacem Hichem, Miquel Jordi
Laboratoire de Biodiversité Marine et Environnement, Département des Sciences de la Vie, Faculté des Sciences de Sfax, Université de Sfax, BP 1171, Sfax 3000, Tunisia.
Secció de Parasitologia, Departament de Biologia, Sanitat i Medi Ambient, Facultat de Farmàcia i Ciències de l'Alimentació, Universitat de Barcelona, Avgda. Joan XXIII, sn, 08028 Barcelona, Spain.
Animals (Basel). 2023 Jun 10;13(12):1953. doi: 10.3390/ani13121953.
The spermatozoon ultrastructure of (Stossich, 1886) (Digenea: Opecoelidae), an intestinal parasite of the sheephead bream (Walbaum, 1792) (Sparidae), is described by means of transmission electron microscopy (TEM). The mature spermatozoon possesses two axonemes of the 9+'1' trepaxonematan pattern, an anterior electron-dense material, two mitochondria, a nucleus and parallel cortical microtubules distributed in two bundles. The absence of external ornamentation of the plasma membrane and spine-like bodies are the noteworthy characters that distinguish the spermatozoon of from those of most opecoelids. In fact, only lacks external ornamentation in the spermatozoon. A comparative study with the remaining opecoelids described so far reveals similarities in the ultrastructural organization of their sperm cells. In addition, the current data on sperm ultrastructure in species of the recognized opecoelid subfamilies are compared, namely the Hamacreadiinae, Helicometrinae, Opecoelinae, Opistholebetinae and Plagioporinae.
利用透射电子显微镜（TEM）描述了（Stossich，1886年）（复殖目：孔肠科）的精子超微结构，该寄生虫寄生于银头鲷（Walbaum，1792年）（鲷科）的肠道内。成熟精子具有9 + '1' 三鞭毛模式的两根轴丝、前部电子致密物质、两个线粒体、一个细胞核以及分布成两束的平行皮质微管。质膜缺乏外部纹饰以及无刺状体是将该寄生虫的精子与大多数孔肠科寄生虫的精子区分开来的显著特征。事实上，只有该寄生虫的精子缺乏外部纹饰。与目前已描述的其余孔肠科寄生虫进行的比较研究揭示了它们精子细胞超微结构组织的相似性。此外，还比较了已确认的孔肠科亚科（即哈马克雷亚科、螺旋宫亚科、孔肠亚科、后孔鲷亚科和斜孔亚科）物种精子超微结构的现有数据。
