Morphology and Phylogeny of Taeniacanthus yamagutii Shiino, 1957 (Hexanauplia: Taeniacanthidae), a Copepod Infecting the
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Morphology and Phylogeny of Taeniacanthus yamagutii Shiino, 1957 (Hexanauplia: Taeniacanthidae), a Copepod Infecting the Gills of Rosy Goatfish Parupeneus rubescens (Mullidae) in the Arabian Gulf ABDEL-GABER Rewaida1), 2), *, AL-QURAISHY Saleh1), DKHIL Mohamed A.1), 3), ALGHAMDI Masheil1), ALGHAMDI Jawahir1), and KADRY Mohamed2) 1) Zoology Department, College of Science, King Saud University, Riyadh 11451, Saudi Arabia 2) Zoology Department, Faculty of Science, Cairo University, Cairo 12613, Egypt 3) Department of Zoology and Entomology, Faculty of Science, Helwan University, Cairo 11794, Egypt (Received February 1, 2020; revised June 18, 2020; accepted July 7, 2020) © Ocean University of China, Science Press and Springer-Verlag GmbH Germany 2020 Abstract The present study was to investigate the copepodid species infecting rosy goatfish Parupeneus rubescens, one of the most economically important fishes in the Arabian Gulf. A copepodid species identified from the examined fish specimens belongs to the Taeniacanthidae family and is labeled as Taeniacanthus yamagutii Shiino, 1957, mainly depending on its morphological, morphometric, and ultrastructural characteristics, in particular the presence of maxilliped claw with a conspicuous digitiform process at the base, the terminal process of the second maxilla stout, and a setiform element at the tip of each exopod spine of legs 2–4. In order to ensure the accurate identification and exact taxonomic characterization of this species, the 28S rRNA gene sequence was analyzed. The result revealed that the present copepodid species belong to the Taenicanthidae family and has a close relationship with Taeniacanthus yamagutii (gb| KR048852.1) in the same taxon. The present study demonstrated that the rosy goatfish is a host for Taeniacanthus species, which will be helpful to prevent this parasitic infection. Key words
parasitic copepods; Taeniacanthidae; Taeniacanthus spp.; Arabian Gulf
1 Introduction Taeniacanthidae is a unique family within the copepod order Cyclopoida, comprising members either parasitic to marine fish or associated with sea urchins (Dojiri and Humes, 1982; Boxshall and Halsey, 2004). Taeniacanthids exhibit a high degree of host specificity at both the generic and specific levels (Boxshall and Halsey, 2004). This family, along with Bomolochidae Sumpf, 1871, Tuccidae Vervoort, 1962, and Tegobomolochidae Avdeev, 1978, are members of the bomolochiform complex (Dojiri and Cressey, 1987; Boxshall and Halsey, 2004). They are characterized by the presence of an indistinctly four-segmented antenna; bearing two pectinate processes, claw-like spines, and setae; a mandible with two subequal spinulated blades; a maxilla bearing spinulated elements; a concave ventral surface of the cephalothorax; and a lamelliform leg 1. There are 25 genera with more than 91 species in Taeniacanthidae (Tang and Izawa, 2005; Tang and Johnston, 2005; Ho and Lin, 2006; Walter and Boxshall, 2019). These genera include Tucca Krøyer, 1837; Haemaphilus; Taeniacanthus * Corresponding author. E
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