The first of 662 equally most parsimonious trees obtained from a heuristic search with 100 random taxon additions of the LSU sequence alignment. The scale bar shows ten changes, and bootstrap support values from 1 000 replicates are shown at the nodes. Novel sequences generated for this study are shown in bold. Branches present in the strict consensus tree are thickened. Orders are shown in coloured blocks to the right of the tree. The tree was rooted to a sequence of Saccharomyces cerevisiae (GenBank accession Z73326).