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Species of Triacanthinella Bychowsky & Nagibina, 1968 (Monogenea: Ancyrocephalidae) from triacanthid teleosts off Peninsular Malaysia, with a generic revision, amended diagnosis and key

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Abstract

One new and four previously described species of Triacanthinella Bychowsky & Nagibina, 1968 (Monogenea) were collected from the tripodfishes Triacanthus biaculeatus and Tripodichthys blochii off Peninsular Malaysia. Triacanthinella lumutensis n. sp. from Tripodichthys blochii off Lumut, Selangor is similar to Triacanthinella principalis Bychowsky & Nagibina, 1968 in having morphologically similar types of haptoral sclerites and copulatory organ, but differs in possessing a longer copulatory tube. Also re-described are T. principalis Bychowsky & Nagibina, 1968, T. gracilis Bychowsky & Nagibina, 1968 and T. aspera Bychowsky & Nagibina, 1968 from both Triacanthus biaculeatus and Tripodichthys blochii, plus Triacanthinella longipenis Bychowsky & Nagibina, 1968 from Tripodichthys blochii and Triacanthinella tripathii Bychowsky & Nagibina, 1968 based on its type-material. In the new species, the filament loop of the anchors is associated with a sheath-like sclerite which envelops the anchor point. Such sclerites were also observed in the present specimens of Triacanthinella principalis, T. aspera, T. longipenis and T. gracilis but were not mentioned in the original descriptions. The generic diagnosis of Triacanthinella is amended and a key to the recognised species is presented. The specific names of two of the previously described species are emended from the neuter form to T. principalis and T. gracilis.

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Acknowledgements

We would like to thank Drs Tatyana Timofeeva, Gergana Vasileva, Boyko Georgiev and Pavel Gerasev translating Russian texts. Pavel Gerasev also examined some slides of Triacanthinella from the collection of the Zoological Museum, St Petersburg and facilitated the loan of the type-material. We are grateful to two referees for their valuable comments. We would also like to thank Prof. Jean-Lou Justine for sharing his Illustrator swatches with us and Mr Liew KS for help in collecting and preparing the specimens used in this study.

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Authors and Affiliations

  1. Institute of Biological Sciences, University of Malaya, 50603, Kuala Lumpur, Malaysia

    L. H. S. Lim

  2. Department of Zoology, Natural History Museum, London, SW7 5BD, UK

    David I. Gibson

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  1. L. H. S. Lim
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  2. David I. Gibson
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Correspondence to L. H. S. Lim.

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Lim, L.H.S., Gibson, D.I. Species of Triacanthinella Bychowsky & Nagibina, 1968 (Monogenea: Ancyrocephalidae) from triacanthid teleosts off Peninsular Malaysia, with a generic revision, amended diagnosis and key. Syst Parasitol 70, 191–213 (2008). https://doi.org/10.1007/s11230-008-9137-7

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  • DOI: https://doi.org/10.1007/s11230-008-9137-7

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