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New species and new records of species of Cloacina von Linstow, 1898 (Nematoda: Strongylida) parasitic in the western scrub wallaby, Notamacropus irma (Jourdan) (Marsupialia: Macropodidae) from Western Australia


The helminth parasites of the western scrub wallaby or black-glove wallaby, Notamacropus irma (Jourdan) which occurs in Western Australia are relatively poorly documented. Six new species of the strongyloid genus Cloacina von Linstow, 1898 (Strongylida: Chabertiidae) are described namely C. asymmetrica n. sp., C. brazellei n. sp., C. harriganae n. sp., C. hobbsi n. sp., C. middletoni n. sp. and C. woodi n. sp. A redescription of C. laius Beveridge, 1999 from the same host species is included. Molecular sequence data (ITS1 and ITS2 ribosomal DNA) were obtained for C. asymmetrica, C. brazellei, C. hobbsi, C. middletoni and from the previously described species C. themis Beveridge, 1998 occurring in the same host species. Phylogenetically, C. asymmetrica, C. hobbsi and C. middletoni formed a distinct clade, suggesting the possibility of within-host speciation. Cloacina themis clustered with a group of morphologically distinctive species in a separate clade and C. brazellei clustered in a third clade but with poor support. This pattern of congeners in a single host species occurring in multiple clades mirrors the situation in other kangaroos and wallabies. Species of Cloacina from N. irma reported thus far therefore consist of a series of species found only in this host, with two species (C. brazellei and C. laius) shared with the sympatric macropodid Setonix brachyurus (Quoy & Gaimard).

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Thanks are due to Russ Hobbs and Bob Brazelle for providing material for this study, to Rosemary Harrigan for help in the laboratory and to Shane Middleton for help on field trips. The study was supported financially by the Australian Biological Resources Study (217-06).

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Beveridge, I., Jabbar, A. & Koehler, A. New species and new records of species of Cloacina von Linstow, 1898 (Nematoda: Strongylida) parasitic in the western scrub wallaby, Notamacropus irma (Jourdan) (Marsupialia: Macropodidae) from Western Australia. Syst Parasitol 96, 453–474 (2019).

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