Journal
JOURNAL OF EUKARYOTIC MICROBIOLOGY
Volume 54, Issue 3, Pages 303-305Publisher
BLACKWELL PUBLISHING
DOI: 10.1111/j.1550-7408.2007.00260.x
Keywords
ciliates; epistylis; mobilida; monophyly; peritrich phylogeny; sessilida; vorticella
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Phylogenetic relationships among peritrich ciliates remain unclear in spite of recent progress. To expand the analyses performed in previous studies, and to statistically test hypotheses of monophyly, we analyzed a broad sample of 18s rRNA sequences (including 15 peritrich genera), applying a conservative alignment strategy and several phylogenetic approaches. The main results are that: (i) the monophyly of Peritrichia cannot be rejected; (ii) the two main clades of Sessilida do not correspond to formally recognized taxa; (iii) the monophyly of genera Vorticella and Epistylis is significantly rejected; and (iv) morphological structures commonly used in peritrich taxonomy may be evolutionarily labile.
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