Little information is available about the biodiversity of parasitic copepods in the Arabian Gulf. The present study aimed to provide new information about different parasitic copepods gathered from Parupeneus rubescens caught in the Arabian Gulf (Saudi Arabia). Copepods collected from the infected fish were studied using light microscopy and scanning electron microscopy and then examined using standard staining and measuring techniques. Phylogenetic analyses were conducted based on the partial 28S rRNA gene sequences from other copepod species retrieved from GenBank. Two copepod species, Hatschekia sargi Brian, 1902 and Hatschekia leptoscari Yamaguti, 1939, were identified as naturally infected the gills of fish. Here we present a phylogenetic analysis of the recovered copepod species to confirm their taxonomic position in the Hatschekiidae family within Siphonostomatoida and suggest the monophyletic origin this family. Sequencing the 28S rRNA gene query identified a close relationship of the recovered Hatschekia species to Hatschekia japonica (gb| KR048858.1). This study identifies a new host for Hatschekia species isolated from Saudi Arabia and performs the first molecular analysis of their 28S rRNA genes.

关于阿拉伯海湾寄生co足类生物多样性的信息很少。本研究旨在提供有关从捕获在阿拉伯海湾（沙特阿拉伯）的红腹对虾的不同寄生co足类动物的新信息。使用光学显微镜和扫描电子显微镜对从感染鱼中收集的足类进行研究，然后使用标准染色和测量技术对其进行检查。系统发育分析是基于从GenBank检索到的其他species足类的28S rRNA基因部分序列进行的。co足类的两个物种，1902年的哈奇基亚·萨尔吉·布莱恩和哈斯奇基亚的鳞翅目1939年的Yamaguti被确定为自然感染的鱼the。在这里，我们对回收的co足类物种进行系统发育分析，以确认其在虹吸壶菌科中的Hatschekiidae家族中的分类地位，并提出该家族的单系起源。对28S rRNA基因查询进行测序后，确定了回收的Hatschekia物种与日本Hatschekia（gb | KR048858.1）的密切关系。这项研究确定了从沙特阿拉伯分离出的Hatschekia物种的新宿主，并对它们的28S rRNA基因进行了首次分子分析。