Abstract
Interest in the evolution of the Trypanosomatidae has been rekindled by the publication of three nuclear small subunit ribosomal RNA (SSU rRNA) gene trees[ 1 Fernandes A.P. Nelson K. Beverley S.M. Proc. Natl. Acad. Sci. U. S. A. 1993; 90: 11608-11612 Crossref PubMed Scopus (218) Google Scholar , 2 Marché S. et al. Mol. Biochem. Parasitol. 1995; 71: 15-26 Crossref PubMed Scopus (42) Google Scholar , 3 Maslov D.A. et al. Mol. Biochem. Parasitol. 1996; 75: 197-205 Crossref PubMed Scopus (227) Google Scholar ]. These trees have resolved a number of questions but have unexpectedly indicated that the salivarian and stercorarian Trypanosoma species of mammals are on quite distinct lineages. The most comprehensive of these phylogenies found that the Trypanosoma species appeared in almost the opposite order to that of their hosts and vectors, which was cautiously interpreted to indicate that coevolution was of minor or short-term importance within the Trypanosoma. However, the boot-strap values of these trees are frequently low and alternative alignments and phylogeny reconstruction methods yield trees in which all species except the salivarian Trypanosoma emerge in the same order as their hosts and vectors (Fig. 1).
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