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Characterization of Filisoma argusum n. sp. (Acanthocephala: Cavisomatidae Meyer, 1932) infecting the spotted scat, Scatophagus argus (Linnaeus, 1766) from the Indian coast

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Abstract

The present paper describes Filisoma argusum n. sp. (Cavisomatidae), an acanthocephalan parasite infecting the intestine of the spotted scat, Scatophagus argus (Linnaeus, 1766), in the south-west coast of India. The prevalence is 18% (mean intensity: 1.61 and abundance: 1–4 worms/host). Filisoma argusum n. sp. is morphologically characterized by a creamy-white, cylindrical, elongate, aspinose, and robust trunk; a collar-like neck; and a cylindrical proboscis with 18–20 longitudinal rows of hooks, with 19–22 hooks/row. Proboscis receptacle long, double-walled. Lemnisci digitiform, equal, longer than proboscis receptacle. Females 79.14 ± 33.69 × 0.593 ± 0.19 mm; males 32.62 ± 2.98 × 0.46 ± 0.071 mm. Males with four cement glands; bulbous muscular copulatory bursa with six digitiform rays. SEM studies revealed smooth hooks, sensory pits, and epidermal micropores. Histopathological changes at the site of parasite attachment included inflammation, hemorrhage, sloughing of epithelium, and detachment of mucosal layer of the intestine. In molecular and phylogenetic analyses, the parasite occupied an independent position within the Cavisomatidae clade with high bootstrap values for both ITS1-5.8S and ITS2, and mt-CO1 regions. Considering the morphologic and morphometric differences with previously described species of Filisoma along with its phylogenetic positioning, the present acanthocephalan is treated as a new species and the name Filisoma argusum n. sp. is proposed.

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Acknowledgements

The authors wish to thank the Director, Central Marine Fisheries Research Institute, Cochin and Indian Council of Agricultural Research, New Delhi, for providing necessary facilities for undertaking this work. The Authors also wish to thank Mr. K.M. David for the help rendered in preparing the line drawings.

Funding

The present study was supported by the Department of Science and Technology, New Delhi, through a Woman Scientist Scheme-A (WOSA) project for the first author (No.SR/ WOS-A/ LS-83/2017).

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  1. Fish Health Section, Marine Biotechnology Division, ICAR-Central Marine Fisheries Research Institute, PB No. 1603, Ernakulam North P.O, Kochi, Kerala, 682018, India

    Pinky Kaur, P. Shamal, Archana Chandran, S.R. Krupesha Sharma & N.K. Sanil

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Kaur, P., Shamal, P., Chandran, A. et al. Characterization of Filisoma argusum n. sp. (Acanthocephala: Cavisomatidae Meyer, 1932) infecting the spotted scat, Scatophagus argus (Linnaeus, 1766) from the Indian coast. Parasitol Res 120, 2505–2521 (2021). https://doi.org/10.1007/s00436-021-07207-7

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