Departament of Parasitology, Universidade Estadual Paulista "Júlio de Mesquita Filho" - UNESP, Botucatu, São Paulo, Brazil.
Departament of Genetics, Faculty of Veterinary Medicine, University of Santiago de Compostela - USC, Santiago de Compostela, Galicia, Spain.
Parasitol Res. 2020 Jun;119(6):1981-1988. doi: 10.1007/s00436-020-06683-7. Epub 2020 May 7.
Among several marine pelagic species of the Brazilian coast, Scomber colias Gmelin, 1789 (Perciformes: Scombridae) stands out for having great economic importance, since it is widely used as a food resource and presents moderate vulnerability. Twenty specimens of S. colias were purchased from October 2015 to October 2016 from the coast of Santa Catarina, Brazil. In the present study, we recorded Hysterothylacium fabri (Rudolphi, 1819) (Deardorff and Overstreet, Proc Biol Soc Wash 93(4):1035-1079 1980) from the S. colias intestine using an integrative taxonomy approach, where morphological data are used in combination with partial sequences of the ITS gene, to validate the taxonomic status of the species and establish their relationships with other members of the genus. This species is being recorded for the first time in the South Atlantic and S. colias. The specimens of H. fabri collected in this study parasitizing S. colias presented morphology similar to the other specimens already registered parasitizing other hosts. The distance matrix generated showed that the partial sequences obtained in this study were more similar to sequences of Hysterothylacium sp. collected in China. In phylogenetic analysis, the two detected haplotypes of this study were grouped with H. fabri haplotypes deposited in GenBank in a monophyletic subclade.
在巴西沿海的几种海洋洄游物种中，鲐鱼（Scomber colias Gmelin，1789）（鲈形目：鲭科）因其具有重要的经济意义而引人注目，因为它被广泛用作食物资源，并且具有中等脆弱性。2015 年 10 月至 2016 年 10 月，从巴西圣卡塔琳娜海岸购买了 20 条 S. colias 标本。在本研究中，我们使用综合分类学方法从 S. colias 的肠道中记录了 Hypsterothylacium fabri（Rudolphi，1819）（Deardorff 和 Overstreet，Proc Biol Soc Wash 93（4）：1035-1079 1980），其中形态数据与 ITS 基因的部分序列结合使用，以验证该物种的分类地位，并确定其与属中其他成员的关系。该物种首次在南大西洋和 S. colias 中被记录。本研究中收集的寄生在 S. colias 上的 Hypsterothylacium fabri 标本的形态与其他已记录的寄生在其他宿主上的标本相似。生成的距离矩阵表明，本研究中获得的部分序列与在中国收集的 Hypsterothylacium sp. 的序列更为相似。在系统发育分析中，本研究中检测到的两个单倍型与 GenBank 中保存的 Hypsterothylacium fabri 单倍型聚在一个单系亚分支中。
