DST-NRD SARChI Chair (Ecosystem Health), Department of Biodiversity, School of Molecular and Life Sciences, University of Limpopo, P/Bag X 1106, Sovenga, 0727, South Africa.
Water Research Group, Unit for Environmental Sciences and Development, North West University, Private Bag X6001, Potchefstroom, 2520, South Africa.
Acta Parasitol. 2020 Jun;65(2):396-412. doi: 10.2478/s11686-020-00175-5. Epub 2020 Feb 13.
Monogenean parasites of the genus Dactylogyrus Diesing, 1850 parasitize mostly gills of cyprinoids hosts. Of 100 species currently known from African continent, approximately 35 have been described from Enteromius spp. Results of recent studies indicate that there are still many undescribed species of the genus Dactylogyrus in South Africa and systematic surveys can bring many new findings.
During the period April 2015-May 2016, three species of the genus Enteromius were sampled from eight localities across Limpopo Province. Monogenean parasites were collected from the gills of the hosts using stereomicroscopes. Morphometric analysis of the hard parts of the attachment organ and male copulatory organs were performed to confirm species identity.
Presence of three new and three previously described Dactylogyrus species is reported. Newly described species include: Dactylogyrus afrohamiltoni sp. nov. from Enteromius afrohamiltoni; Dactylogyrus limpopoensis sp. nov. and Dactylogyrus letabaensis sp. nov. from Enteromius unitaeniatus. In addition, Dactylogyrus afrolongicornis, Dactylogyrus allolongionchus and Dactylogyrus myersi were identified from Enteromius trimaculatus. Newly identified species possess morphometric characters based on which they can be clearly identified from currently known species.
Present results show that small barbs, especially those not previously studied for monogenean parasites, are potentially very interesting target to study to recover new species of the genus Dactylogyrus and to bring new contribution to the knowledge of the diversity of African parasites.
寄生在鲤科鱼类鳃上的双鳞盘虫属（Dactylogyrus Diesing，1850）寄生虫大多寄生在鱼类的鳃上。在目前已知的 100 种非洲大陆的物种中，约有 35 种是从肠鱼属（Enteromius）中描述的。最近的研究结果表明，南非仍有许多双鳞盘虫属未被描述的物种，系统调查可以带来许多新的发现。
在 2015 年 4 月至 2016 年 5 月期间，从林波波省的 8 个不同地点采集了三种肠鱼属。使用立体显微镜从宿主的鳃上采集单殖吸虫寄生虫。对附着器官和雄性交配器官的硬体部分进行形态测量分析，以确认物种身份。
报告了三种新的和三种以前描述的双鳞盘虫属。新描述的物种包括：从肠鱼属的非洲肠鱼（Enteromius afrohamiltoni）中分离出的非洲双鳞盘虫（Dactylogyrus afrohamiltoni）；从肠鱼属的独带肠鱼（Enteromius unitaeniatus）中分离出的林波波双鳞盘虫（Dactylogyrus limpopoensis）和 Letaba 双鳞盘虫（Dactylogyrus letabaensis）。此外，还从肠鱼属的三斑肠鱼（Enteromius trimaculatus）中鉴定出双鳞盘虫（Dactylogyrus afrolongicornis）、Dactylogyrus allolongionchus 和 Dactylogyrus myersi。新鉴定的物种具有形态特征，根据这些特征可以将其与目前已知的物种清晰区分开来。
目前的结果表明，小棘，特别是那些以前没有被研究过的单殖吸虫寄生虫的小棘，是一个非常有趣的研究目标，可以发现新的双鳞盘虫属物种，并为非洲寄生虫多样性的研究做出新的贡献。
