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A comprehensive analysis of the biogeography of the thelastomatoid pinworms from Australian burrowing cockroaches (Blaberidae: Geoscapheinae, Panesthiinae): no evidence of coevolution

Published online by Cambridge University Press:  24 April 2007

A. R. JEX*
Affiliation:
School of Molecular and Microbial Sciences, The University of Queensland, St Lucia, Brisbane, Queensland 4072, Australia
M. A. SCHNEIDER
Affiliation:
School of Integrative Biology, The University of Queensland, St Lucia, Brisbane, Queensland 4072, Australia
H. A. ROSE
Affiliation:
School of Land, Water and Crop Sciences, The University of Sydney, Sydney, New South Wales 2006, Australia
T. H. CRIBB
Affiliation:
School of Molecular and Microbial Sciences, The University of Queensland, St Lucia, Brisbane, Queensland 4072, Australia
*
*Corresponding author: Department of Veterinary Science, The University of Melbourne, Victoria 3030, Australia. Tel: +61 3 9731 2294. Fax: +61 3 9731 2000. E-mail: [email protected]

Summary

We report 21 thelastomatoid species parasitizing 31 described and 5 undescribed geoscapheine and panesthiine cockroaches, representing all but 1 of the known species of these subfamilies in Australia. The nematodes have 3 distinct patterns of host distribution: dominant, moderate and rare. The 4 dominant species, Cordonicola gibsoni, Leidynemella fusiformis, Travassosinema jaidenae and Aoruroides queenslandensis, are highly prevalent, found in nearly all host species examined, and broadly distributed. The 8 moderate species have lower prevalences but are still widely distributed. Many of these species are more common in one host subfamily than the other. The remaining 9 rare species have highly restricted host and geographical distributions. Six of the 21 species are exclusive to geoscapheines, 5 to panesthiines and 10 are shared. These patterns suggest that most of the reported thelastomatoid species are generalists rather than specialists, that host-specificity within this group is low and that co-evolutionary speciation has had little, if any, impact on structuring the thelastomatoid fauna of Australian burrowing cockroaches. In a broader context, this study provides the first comprehensive examination of the role of coevolutionary speciation and host specificity in regulating the distribution of pinworms in arthropods.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2007

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