Foata Joséphine, Quilichini Yann, Marchand Bernard
Laboratoire Parasites et Ecosystèmes Méditerranéens, Faculté des Sciences et Techniques, Université de Corse, Campus Grossetti, 20250 Corte, France.
Parasitol Res. 2007 Sep;101(4):843-52. doi: 10.1007/s00436-007-0550-7. Epub 2007 May 7.
To our knowledge, this paper describes the first ultrastructural results on spermiogenesis and the spermatozoon of a Digenea belonging to the family Deropristidae, Deropristis inflata. Spermiogenesis follows the usual pattern found in the digeneans, but a single noteworthy characteristic concerns the centriole, which presents a "prominent pear-shaped electron-dense region." Spermiogenesis in D. inflata begins with the formation of a differentiation zone. The two centrioles give rise to flagella. These two flagella undergo a rotation of 90 degrees and fuse with the median cytoplasmic process. The proximo-distal fusion occurs at the level of attachment zones. The mature spermatozoon of D. inflata possesses five regions and presents all the features found in the digenean gamete. However, several characteristics allow us to distinguish the spermatozoon of D. inflata from other digenetic trematoda, namely the external ornamentations of the plasmic membrane, the anterior and posterior extremities. Furthermore, the distal part of the nucleus in front of those of the mitochondria appears such a distinctive criterion in the spermatozoon of this species. Our ultrastructural investigations produce new data on the reproduction of D. inflata, which may be useful for the understanding of the phylogenetic relationships in the Deropristidae family.
据我们所知，本文描述了关于膨腹短腺吸虫（Deropristis inflata）精子发生和精子的首次超微结构研究结果。膨腹短腺吸虫隶属短腺科，其精子发生遵循复殖吸虫中常见的模式，但有一个值得注意的特征涉及中心粒，即呈现出一个“显著的梨形电子致密区”。膨腹短腺吸虫的精子发生始于分化区的形成。两个中心粒产生鞭毛。这两根鞭毛旋转90度并与中间细胞质突起融合。近端到远端的融合发生在附着区水平。膨腹短腺吸虫的成熟精子具有五个区域，并呈现出复殖吸虫配子中发现的所有特征。然而，有几个特征使我们能够将膨腹短腺吸虫的精子与其他复殖吸虫区分开来，即质膜的外部纹饰、前后端。此外，在该物种精子中，细胞核远端部分相对于线粒体的位置似乎是一个独特的标准。我们的超微结构研究为膨腹短腺吸虫的繁殖提供了新数据，这可能有助于理解短腺科的系统发育关系。
