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Septesinus gibsoni n. g., n. sp. (Monocotylidae: Heterocotylinae), from the gills of Himantura walga (Dasyatidae) off Sarawak, Borneo

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Abstract

Septesinus gibsoni n. g., n. sp. (Monocotylidae: Heterocotylinae) is described from the gills of the dwarf whipray Himantura walga (Müller & Henle) collected in marine waters off Sarawak (Borneo), Malaysia. Septesinus n. g. is distinguished from other genera in the Monocotylidae by a combination of characters, including a haptor with one central and seven peripheral loculi, the presence of a highly sinuous ridge surmounting all haptoral septa, four rounded accessory structures on the dorsal surface of the haptor, and the anterior region with two pairs of anteromedian and three pairs of anterolateral gland-duct openings. Septesinus n. g. is accommodated in the Heterocotylinae. Septesinus gibsoni n. sp. is described and fully illustrated, and a key to the genera of Heterocotylinae is provided. The composition of the ridges surrounding the mouth of a number of heterocotyline species and their usefulness as a taxonomic character are examined. The identity of four specimens of Monocotyle Taschenberg, 1878, also recovered from the gills of this host species, is discussed.

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Acknowledgements

I thank Janine Caira (University of Connecticut, USA) and Kirsten Jensen (University of Kansas, USA) for collecting a vast diversity of elasmobranch material. This study would not have been possible without their support and outstanding efforts. I am also grateful to L.H.S. Lim and T. Wooiboon (MZUM), M. Naming (SBC) and P. Pilitt (USNPC) for accessioning material. I wish to express my sincere thanks to David Gibson for his editorial assistance over the years; this is the final paper he oversaw as editor for Systematic Parasitology. This study was supported by funds from the National Science Foundation’s Biotic Surveys and Inventories Program (award nos. DEB-103640, 0542846, 0542941).

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  1. Monogenean Research Laboratory, Parasitology Section, The South Australian Museum, North Terrace, Adelaide, SA, 5000, Australia

    Leslie A. Chisholm

  2. Marine Parasitology Laboratory, School of Earth and Environmental Sciences (DX 650 418), The University of Adelaide, North Terrace, Adelaide, SA, 5005, Australia

    Leslie A. Chisholm

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  1. Leslie A. Chisholm
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Correspondence to Leslie A. Chisholm.

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Chisholm, L.A. Septesinus gibsoni n. g., n. sp. (Monocotylidae: Heterocotylinae), from the gills of Himantura walga (Dasyatidae) off Sarawak, Borneo. Syst Parasitol 84, 255–264 (2013). https://doi.org/10.1007/s11230-013-9405-z

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  • DOI: https://doi.org/10.1007/s11230-013-9405-z

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