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Molecular Biology and Evolution, Vol 12, 285-290, Copyright © 1995 by Society for Molecular Biology and Evolution

ORIGINAL ARTICLE

Phylogeny of the fish parasite Ichthyophthirius and its relatives Ophryoglena and Tetrahymena (Ciliophora, Hymenostomatia) inferred from 18S ribosomal RNA sequences

AD Wright and DH Lynn
Department of Zoology, University of Guelph, Ontario, Canada.

Phylogenetic relationships within the subclass Hymenostomatia were inferred from the comparisons of three new SSrRNA gene sequences from Ichthyophthirius multifiliis (1,751 bp), Ophryoglena catenula (1,748 bp), and Tetrahymena corlissi (1,753 bp). Using maximum-parsimony and distance-matrix methods, Ichthyophthirius and Ophryoglena were consistently paired and formed a sister group to the tetrahymenines, consistent with their placement in the Ophryoglenina. Tetrahymenids formed a monophyletic group that was divided into main lineages: T. corlissi diverged from the base of the lineage that included T. thermophila.
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