Redescription and Molecular Characterization of the External Attaching Fish Parasitic Cymothoid, Nerocila phaiopleura Bleeker, 1857 (Crustacea: Isopoda) off the Southwest Coast of India
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Abstract
Purpose
The identification of the external attaching fish parasitic cymothoid, Nerocila phaiopleura Bleeker 1857, is still based on the brief description of Australian specimens provided by Bruce (1987). The present study aimed to provide a redescription and molecular characterisation of Indian specimens of N. phaiopleura.
Materials and Methods
Morphological identification was carried out based on microscopic examinations and taxonomic drawings. mitochondrial DNA cox1 was selected as the target gene for sequencing and molecular identification. Nucleotide genetic divergence (p-distance) and base-pair differences among the different species were determined using MEGA11.
Results
Nerocila phaiopleura can be well separated from its congeners by the following combination of characteristics: Body about 2.4 times as long as wide, cephalon broadly rounded anteriorly; coxae posteriorly directed, acute and extending beyond their corresponding pereonite; pereonite 7 posterior angle produced, extending to the pleonite 1; pleonites 1 and 2 ventrolateral process posteriorly directed; uropod exopod straight and elongate, 1.7–2.0 times longer than endopod; uropod endopod lateral margin not serrate, no notch on medial margin; pereopods with short ischium; pleotelson triangular. The p-distance among N. phaiopleura and other available Nerocila spp. ranged from 21 to 19%.
Conclusion
This study represents the first detailed taxonomic redescription of Indian specimens of N. phaiopleura. Key taxonomic features of the life stages and molecular data are provided here to identify the species properly. Interspecific genetic divergence between N. phaiopleura and other Nerocila spp. is assessed for the first time. Studies in cymothoid life histories, genetics, and morphology are necessary to understand one of the least understood parasite families.
期刊介绍：
Acta Parasitologica is an international journal covering the latest advances in the subject.
Acta Parasitologica publishes original papers on all aspects of parasitology and host-parasite relationships, including the latest discoveries in biochemical and molecular biology of parasites, their physiology, morphology, taxonomy and ecology, as well as original research papers on immunology, pathology, and epidemiology of parasitic diseases in the context of medical, veterinary and biological sciences. The journal also publishes short research notes, invited review articles, book reviews.
The journal was founded in 1953 as "Acta Parasitologica Polonica" by the Polish Parasitological Society and since 1954 has been published by W. Stefanski Institute of Parasitology of the Polish Academy of Sciences in Warsaw. Since 1992 in has appeared as Acta Parasitologica in four issues per year.
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