Rugopharynx rosemariae new species (nematoda: Pharyngostrongylidae) from grey kangaroos (Macropus gig anteus and M. fuliginosus) with life cycle stages and associated pathology

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Abstract

Beverdge I. and Ppresidente P. J. A. 1978. Rugopharynx rosemarie sp. nov. (Nematoda: Pharyngostrongylidae) from grey kangaroos (Macropus giganteus and M. fuliginosus) with life cycle stages and associated pathology. International Journal for Parasitology8: 379–387. Rugopharynx rosemariae new species is described from the stomachs of grey kangaroos, Macropus giganteus Shaw, 1790 and Macropus fuliginosus (Desmarest, 1817) from south-eastern Australia. The new species differs from other species of the genus in spicule length and in the length and shape of the oesophagus. Parasitic life-cycle stages are described from natural infections; free-living life-cycle stages were obtained by culturing eggs from gravid females. Third stage larvae burrow into the gastric mucosa producing small elevated nodules resulting from a localized fibroplastic and inflammatory reaction in the lamina propria and submucosa. Fourth stage and adult worms occur in the stomach lumen. Rugopharynx brevis (Canavan, 1931) is made a synonym of Rugopharynx australis (Mönnig, 1926).

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Cited by (13)

  • Mammal parasites in arid Australia

    2020, International Journal for Parasitology: Parasites and Wildlife
    Citation Excerpt :

    In the case of the hookworm -like strongylid nematode, Hypodontus macropi, found in the ileum, caecum and colon of red kangaroos, the first stage larva hatches from the egg but when moulting to the second retains the sheath of the first stage larva and the same happens in the second moult such that the infective third stage larva has two sheaths, thus potentially increasing its resistance to dessication (Beveridge, 1979). However, a similar developmental strategy has also been reported in Labiomultiplex eugenii in the tammar wallaby (Notamacropus eugenii) in higher rainfall areas in South Australia (Smales, 1977) and in Rugopharynx rosemariae from grey kangaroos in higher rainfall areas (Beveridge and Presidente, 1978). Consequently, this form of larval development may not be restricted to nematodes in the arid zone.

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    The nematode M. baylisi may also feed on blood (Arundel et al., 1990), however clinical impacts have never been confirmed. Larvae of a third species, R. rosemariae, can cause severe lesions on the gastric mucosa, yet hosts can carry large burdens without any obvious effects on health (Beveridge and Presidente, 1978). As in all eastern grey kangaroo populations, helminth coinfection was ubiquitous in kangaroos at our site, and juveniles were infected with between 5 and 8 different helminth species (post-mortem data, Cripps, unpublished data).

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Current address: Department of Tropical Veterinary Science, James Cook University, Townsville, 4811, Queensland, Australia.

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