title: Phylogenetic relationships of species of the oesophageal parasitic nematode genera Cyclostrongylus and Spirostrongylus (Strongyloidea: Chabertiidae: Cloacininae) with their wallaby hosts (Marsupialia: Macropodidae).
abstract: A phylogeny for seven species of Cyclostrongylus and the monotypic genus Spirostrongylus (Nematoda: Chabertiidae), all highly host specific parasites of the oesophagi of wallabies (Marsupialia: Macropodidae), was constructed using sequence data for the first and second internal transcribed spacers (ITS-1 and ITS-2) of the nuclear ribosomal DNA. There was no evidence for co-speciation, or for the sympatric or synxenic speciation of Cyclostrongylus alatus and Cyclostrongylus perplexus, both of which are parasites of Macropus rufogriseus. Rather, host switching, correlating with geographical distributions, appeared to provide some explanation of the pattern of speciation observed.
authors.affiliation: Department of Biology, University of Saskatchewan, Saskatoon, Saskatchewan, Canada; Faculty of Veterinary and Agricultural Science, University of Melbourne, Parkville, Victoria, Australia. Electronic address: neil.chilton@usask.ca.
authors.forename: Neil B
authors.initials: NB
authors.lastname: Chilton
authors.affiliation: Faculty of Veterinary and Agricultural Science, University of Melbourne, Parkville, Victoria, Australia.
authors.forename: Florence
authors.initials: F
authors.lastname: Huby-Chilton
authors.affiliation: Faculty of Veterinary and Agricultural Science, University of Melbourne, Parkville, Victoria, Australia.
authors.forename: Anson V
authors.initials: AV
authors.lastname: Koehler
authors.affiliation: Faculty of Veterinary and Agricultural Science, University of Melbourne, Parkville, Victoria, Australia.
authors.forename: Robin B
authors.initials: RB
authors.lastname: Gasser
authors.affiliation: Faculty of Veterinary and Agricultural Science, University of Melbourne, Parkville, Victoria, Australia.
authors.forename: Ian
authors.initials: I
authors.lastname: Beveridge
mesh_terms: D000818:Animals; D021903:DNA, Ribosomal Spacer / Q000235:genetics; D004947:Esophagus / Q000469:parasitology; D058507:Host Specificity; D006790:Host-Parasite Interactions; D007614:Macropodidae / Q000469:parasitology* / Q000502:physiology; D010802:Phylogeny; D017422:Sequence Analysis, DNA / Q000379:methods*; D013320:Strongyloidea / Q000145:classification* / Q000235:genetics / Q000502:physiology
chemical_list: D021903:DNA, Ribosomal Spacer
keywords: Chabertiidae; Cyclostrongylus; Macropodidae; Macropus; Nuclear ribosomal DNA; Phylogeny; Spirostrongylus; Wallabia