Aneesh Panakkool Thamban, Hadfield Kerry A, Smit Nico J, Kumar Appukuttannair Biju
Department of Aquatic Biology & Fisheries, University of Kerala, Karyavattom, Thiruvananthapuram, 695581, Kerala, India.
Water Research Group, Unit for Environmental Sciences and Management, North-West University, Private Bag X6001, Potchefstroom, 2520, South Africa.
Int J Parasitol Parasites Wildl. 2021 Mar 24;14:321-328. doi: 10.1016/j.ijppaw.2021.03.007. eCollection 2021 Apr.
A fish parasitic isopod recently reported from India as Bleeker, 1857, was re-examined and morphologically compared to five closely related species: Leach, 1818, Williams and Bunkley-Williams, 1986, Bleeker, 1857, Welicky and Smit, 2019 and Bariche and Trilles, 2006. This species was sequenced and compared to other known species based on mitochondrial cytochrome oxidase subunit I (COI) gene fragments Both morphological and molecular data corroborate that the species parasitising the clupeid fish (Valenciennes, 1847) from India should be recognised as a new species, and we describe n. sp. based on the holotype and paratype females. The key characters of n. sp. include the body being less than 4.0 times as long as wide; antennula article 3 anterodistal margin expanded, 1.2-1.4 times as wide as long; pleonite 1 concealed by pereonite 7 and lateral margin posteriorly produced; pereopods 1-4 with three nodules on dactylus; endopod of pleopods 3-5 with a proximomedial lobe and folding; and pleotelson ovate, with lateral margins converging smoothly to a caudomedial point.
最近在印度报道的一种寄生在鱼类身上的等足目动物（Bleeker，1857年）经过重新检查，并与五个近缘物种进行了形态学比较：Leach，1818年；Williams和Bunkley-Williams，1986年；Bleeker，1857年；Welicky和Smit，2019年；以及Bariche和Trilles，2006年。对该物种进行了测序，并基于线粒体细胞色素氧化酶亚基I（COI）基因片段与其他已知物种进行了比较。形态学和分子数据均证实，寄生在印度鲱科鱼类（Valenciennes，1847年）身上的该物种应被认定为一个新物种，我们根据正模和副模雌性个体描述了这个新物种。新物种的关键特征包括：身体长度不到宽度的4.0倍；触角第3节的前远端边缘扩展，宽度是长度的1.2 - 1.4倍；第1腹节被第7胸节掩盖，后缘侧方突出；第1 - 4步足的指节上有三个瘤；第3 - 5腹足的内肢有一个近端内侧叶且可折叠；尾节卵形，侧缘平滑地汇聚到尾内侧点。
