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Integrative and Comparative Biology Advance Access published online on June 27, 2007
Integrative and Comparative Biology, doi:10.1093/icb/icm026
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© The Author 2007. Published by Oxford University Press on behalf of the Society for Integrative and Comparative Biology. All rights reserved. For permissions please email: journals.permissions@oxfordjournals.org.

Origin and evolution of a myxozoan worm

Eva Jiménez-Guri*, Beth Okamura2,{dagger} and Peter W. H. Holland1,*
*Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS, UK; {dagger}School of Biological Sciences, University of Reading, Whiteknights, Reading RG6 6BX, UK

Correspondence: 1E-mail: peter.holland{at}zoo.ox.ac.uk

Buddenbrockia plumatellae is an active, muscular, worm-shaped parasite of freshwater bryozoans. This rare and enigmatic animal has been assigned to the Myxozoa on the basis of 18S ribosomal DNA sequences and the presence of malacosporean spores. Here we report cloning of four homologous protein-coding genes from Buddenbrockia worms, the putatively conspecific sac-shaped parasite originally described as Tetracapsula bryozoides and the related sac-shaped parasite Tetracapsuloides bryosalmonae, the causative agent of proliferative kidney disease in salmonid fish. Analyses are consistent with the hypothesis that Buddenbrockia is indeed a malacosporean myxozoan, but do not provide support for conspecificity with either T. bryozoides or T. bryosalmonae. Implications for the evolution of worm-like body plans in the Myxozoa are discussed.

From the symposium "Key Transitions in Animal Evolution" presented at the annual meeting of the Society for Integrative and Comparative Biology, January 3–7, 2007, at Phoenix, Arizona.

2Present address: Department of Zoology, National History Museum, Cromwell Road, London SW7 5BD, UK


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