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Speciation in the genus Cloacina (Nematoda: Strongylida): species flocks and intra-host speciation

Published online by Cambridge University Press:  12 July 2017

N. B. CHILTON
Affiliation:
Department of Biology, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
M. A. SHUTTLEWORTH
Affiliation:
Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, Victoria, Australia
F. HUBY-CHILTON
Affiliation:
Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, Victoria, Australia
A. V. KOEHLER
Affiliation:
Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, Victoria, Australia
A. JABBAR
Affiliation:
Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, Victoria, Australia
R. B. GASSER
Affiliation:
Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, Victoria, Australia
I. BEVERIDGE*
Affiliation:
Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, Victoria, Australia
*
*Corresponding author: Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, Victoria, Australia. E-mail: ibeve@unimelb.edu.au

Summary

Sequences of the first and second internal transcribed spacers (ITS1 + ITS2) of nuclear ribosomal DNA were employed to determine whether the congeneric assemblages of species of the strongyloid nematode genus Cloacina, found in the forestomachs of individual species of kangaroos and wallabies (Marsupialia: Macropodidae), considered to represent species flocks, were monophyletic. Nematode assemblages examined in the black-striped wallaby, Macropus (Notamacropus) dorsalis, the wallaroos, Macropus (Osphranter) antilopinus/robustus, rock wallabies, Petrogale spp., the quokka, Setonix brachyurus, and the swamp wallaby, Wallabia bicolor, were not monophyletic and appeared to have arisen by host colonization. However, a number of instances of within-host speciation were detected, suggesting that a variety of methods of speciation have contributed to the evolution of the complex assemblages of species present in this genus.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2017 

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References

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