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Hydrobiologia

, Volume 305, Issue 1–3, pp 37–43 | Cite as

5S rRNA sequences of 12 species of flatworms: implications for the phylogeny of the Platyhelminthes

  • B. I. Joffe
  • K. M. Valiejo Roman
  • V. Ya. Birstein
  • A. V. Troitsky
Taxonomy and phylogeny

Abstract

5S rRNAs from 12 species of free living and parasitic platyhelminthes were sequenced. In the phylogenetic analysis, attention was focused on the statistical estimates of the trees corresponding to existing phylogenetic hypotheses. The available 5S rRNA data agree well with widely accepted views on the relationships between the Acoela, Polycladida, Tricladida, and Neorhabdocoela; our analysis of the published 18S rRNA sequences also demonstrated good correspondence between these views and molecular data. With available 5S rRNA data the hypothesis that the dalyellioid turbellarians is the sister group of the Neodermata is less convincing than the hypotheses proposing the Neodermata as the sister group of the Neorhabdocoela, or of the Seriata, or of the branch uniting them. A relatively low rate of base replacement in parasitic flatworms, probably, accounts for the uncertain position of the Neodermata, while a relatively high rate in planarians may explain a relatively too early divergence of the Tricladida in several published phylogenetic trees constructed from various rRNA data.

Key words

5S rRNA Platyhelminthes Turbellaria parasitic flatworms phylogeny 

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Copyright information

© Kluwer Academic Publishers 1995

Authors and Affiliations

  • B. I. Joffe
    • 1
  • K. M. Valiejo Roman
    • 2
  • V. Ya. Birstein
    • 3
  • A. V. Troitsky
    • 2
  1. 1.Zoological Institute RANSt-PetersburgRussia
  2. 2.A. N. Belozersky Institute of Physico-Chemical BiologyMoscow State UniversityMoscowRussia
  3. 3.N. K. Koltzov Institute of Developmental Biology RANMoscowRussia

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