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Molecular Biology and Evolution, Vol 13, 1128-1132, Copyright © 1996 by Society for Molecular Biology and Evolution

ORIGINAL ARTICLE

Origin of the Mesozoa inferred from 18S rRNA gene sequences

J Pawlowski, JI Montoya-Burgos, JF Fahrni, J Wuest and L Zaninetti
Departement de Zoologie et Biologie animale, Universite de Geneve, Switzerland. pawlow@sc2a.unige.ch

The phylum Mesozoa comprises small, simply organized wormlike parasites of marine invertebrates and is composed of two classes, the Rhombozoa and the Orthonectida. The origin of Mesozoa is uncertain; they are classically considered either as degenerate turbellarians or as primitive multicellular animals related to ciliated protists. In order to precisely determine the phylogenetic position of this group we sequenced the complete 18S rRNA gene of one rhombozoid, Dicyema sp., and one orthonectid, Rhopalura ophiocomae. The sequence analysis shows that the Mesozoa branch early in the animal evolution, closely to nematodes and myxozoans. Our data indicate probably separate origins of rhombozoids and orthonectids, suggesting that their placement in the same phylum needs to be revised.
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