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Nematodes from the squeaker fishes Synodontis nigromaculatus and S. vanderwaali from the Okavango River, Botswana, including three new species

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Abstract

Five nematode species were recorded from the stomach and rectum of the spotted squeaker Synodontis nigromaculatus Boulenger or the finetooth squeaker S. vanderwaali Skelton & White (Mochokidae, Siluriformes) from the Okavango River, Botswana: Falcaustra similis n. sp. (Kathlaniidae), Labeonema africanum n. sp. (Cosmocercidae), Synodontisia okavangoensis n. sp. (Pharyngodonidae), Procamallanus (Procamallanus) laeviconchus (Wedl, 1861) (Camallanidae) and Spinitectus sp. (Cystidicolidae) (only a single female). F. similis (type-host Synodontis nigromaculatus) differs from the similar species F. straeleni Campana-Rouget, 1961 mainly by the number and disposition of the male caudal papillae and the structure of the mouth; L. africanum (type-host S. nigromaculatus) differs from its congeners in having distinctly longer spicules (105-120 μm), a relatively shorter gubernaculum (30-36 μm) and in the number and arrangement of the male caudal papillae; Synodontisia okavangoensis (type-host Synodontis nigromaculatus) is characterised principally by crescent-shaped cephalic papillae, length (87 μm) and shape of the spicule as well as large eggs (0.156-0.180 × 69-102 μm). Synodontisia moraveci Anderson & Lim, 1996 is transferred to a newly established genus, Royandersonia n. g., (as its type-species) as R. moraveci (Anderson & Lim, 1996) n. comb. Some taxonomic problems concerning Procamallanus (P.) laeviconchus are discussed. All species were studied by scanning electron microscopy for the first time.

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Authors and Affiliations

  1. Institute of Parasitology, Academy of Sciences of the Czech Republic, Branišovská 31, 370 05, České Budějovice, Czech Republic

    František Moravec

  2. Department of Zoology and Entomology, University of the Free State, PO Box 339, Bloemfontein, 9300, South Africa

    Jo G. Van As

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  1. František Moravec
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  2. Jo G. Van As
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Moravec, F., Van As, J.G. Nematodes from the squeaker fishes Synodontis nigromaculatus and S. vanderwaali from the Okavango River, Botswana, including three new species. Syst Parasitol 59, 169–187 (2004). https://doi.org/10.1023/B:SYPA.0000048097.20483.e4

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