Morphometric and molecular characterisation of Tenuiproboscis keralensis n. sp. infecting marine and brackish water fishes from the south-west coast of India with a note on morphological plasticity.

Kaur, Pinky and Shamal, P and Chandran, Archana and Binesh, C P and Mohan, Gishnu and Asokan, P K and Sanil, N K (2017) Morphometric and molecular characterisation of Tenuiproboscis keralensis n. sp. infecting marine and brackish water fishes from the south-west coast of India with a note on morphological plasticity. Parasitology Research, 116. pp. 3131-3149. ISSN 1432-1955

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    Abstract

    A new species of acanthocephalan infecting marine and brackish water fishes from the south-west coast of India is described. The parasite belongs to the genus Tenuiproboscis, and the fish hosts include Lutjanus argentimaculatus, L. ehrenbergii, Siganus javus, Epinephelus malabaricus, E. coioides, Scatophagus argus, Parascolopsis aspinosa, Caranx ignobilis, Gerres filamentosus and Lates calcarifer. The parasite inhabits mid- and hindgut regions and is characterised by an elongated, cylindrical, bulbous and posteriorly tapering metasoma and a claviform proboscis having 14-15 rows of 14-15 hooks each. Females larger than males, measured 3898.16-10,318.00 μm (6430.00 ± 1417.30) in length and 458.93-1435.68 μm (929.81 ± 250.39) in width. Males measured 3234.89-8644.20 μm (5729.50 ± 1176.60) in length and 388.30-1584.61 μm (795.88 ± 184.12) in width. Parasites recovered from different host species showed morphological/morphometric variations. However, principal component analysis (PCA) revealed significant overlapping of characters indicating their similarities. Proboscis profiling based on variations in size and position of hooks also yielded similar results. Further, in molecular phylogenetic analysis, parasites from different fish hosts formed a monophyletic clade with strong bootstrap support, again indicating their conspecific nature. These morphological/morphometric variations can be ascribed to differences in host species. Morphology and morphometrics in combination with PCA, proboscis profiling and molecular analysis suggest the present acanthocephalan parasite is different from other described species of Tenuiproboscis. Hence, it is considered as a new species and named T. keralensis n. sp. Prevalence, intensity and abundance of the parasite in different hosts are also discussed.

    Item Type: Article
    Uncontrolled Keywords: Acanthocephala; Morphological plasticity; Principal component analysis; Proboscis profiling; Tenuiproboscis keralensis
    Subjects: Fish Biotechnology > Microbiology
    Fish Biotechnology
    Divisions: CMFRI-Kochi > Marine Biotechnology
    Subject Area > CMFRI > CMFRI-Kochi > Marine Biotechnology
    CMFRI-Kochi > Marine Biotechnology
    Subject Area > CMFRI-Kochi > Marine Biotechnology
    Depositing User: Arun Surendran
    Date Deposited: 12 Jun 2018 10:57
    Last Modified: 12 Jun 2018 10:57
    URI: http://eprints.cmfri.org.in/id/eprint/12845

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