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Descriptions of two new acanthocephalans (Rhadinorhynchidae) from marine fish off the Pacific coast of Vietnam

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Abstract

Two rhadinorhynchid acanthocephalans are described from marine fishes off the Pacific coast of Vietnam. Sclerocollum neorubrimaris n. sp. (Gorgorhynchinae Van Cleave & Lincicome, 1940) is described from the spine-foot rabbitfish Siganus guttatus (Bloch) (Siganidae) off Nha Trang. The new species is similar to the type-species, Sclerocollum rubrimaris Schmidt & Paperna, 1978 in most measurements and counts but has a posterior cephalic ganglion, a sub-ventral female gonopore, and one dorsal paravaginal filament bundle. In S. rubrimaris, the cephalic ganglion is near the middle of the receptacle, the female gonopore is terminal with two paravaginal filament bundles. The new species is distinguished from three other species of Sclerocollum Schmidt & Paperna, 1978 in proboscis hook formulas and the position of the female gonopore and cephalic ganglion. The issue of the importance of the position of the cephalic ganglion at the generic and sub-generic levels in the Acanthocephala is discussed. Females of Australorhynchus multispinosus n. sp. (Gorgorhynchinae) are described from the red cornetfish Fistularia petimba Lacépède off Nha Trang in the Pacific south. It is distinguished from the only other species of the genus, Australorhynchus tetramorphacanthus Lebedev, 1967, by having more trunk spines extending beyond the level of the proboscis receptacle and a smaller proboscis with considerably fewer hooks.

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Acknowledgements

We thank Naomi Mortensen, Bean Museum (BYU) for expert help in the preparation and organization of plates. We are especially grateful to Dr Anna Phillips (USNPC, Washington, D.C., USA), Dr Gabor Racz (HWML, Lincoln, Nebraska, USA), Dr Leslie Chisholm (SAM, Adelaide, Australia), Eileen Harris and Jasmin Perera (NHM, London, UK), Dr Stephen Keable and Dr Camron Slatyer (AM, Sydney, Australia) for making it possible for us to study the type- and voucher material loaned from their respective institutions.

Funding

This project was supported by the Department of Biology, Brigham Young University (BYU), Provo, Utah, the Vietnam National Program No. 47 under Grant code VAST.DA47.12/16-19, and by an Institutional Grant from the Parasitology Center, Inc. (PCI), Scottsdale, Arizona.

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Authors and Affiliations

  1. Institute of Parasitic Diseases (IPD), 11445 E. Via Linda 2-419, Scottsdale, AZ, 85259, USA

    Omar M. Amin

  2. Department of Biology, Brigham Young University, 1114 MLBM, Provo, UT, 84602, USA

    Richard A. Heckmann

  3. Department of Parasitology, Institute of Ecology and Biological Resources (IEBR), Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam

    Nguyen Van Ha

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  1. Omar M. Amin
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  2. Richard A. Heckmann
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  3. Nguyen Van Ha
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Correspondence to Omar M. Amin.

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The authors declare that they have no conflict of interest.

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All applicable institutional, national and international guidelines for the care and use of animals were followed.

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This article is part of the Topical Collection Acanthocephala.

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Amin, O.M., Heckmann, R.A. & Van Ha, N. Descriptions of two new acanthocephalans (Rhadinorhynchidae) from marine fish off the Pacific coast of Vietnam. Syst Parasitol 96, 117–129 (2019). https://doi.org/10.1007/s11230-018-9833-x

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  • DOI: https://doi.org/10.1007/s11230-018-9833-x

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