FIG. 3.

NJ tree of partial 18S rRNA gene sequences from all taxonomic clades reported here (boldface). Sequences with >99% similarity were pruned from the tree for clarity. Palmata palmata is the red algal outgroup. Choanoflagellates are shown separately, as these were difficult to align within the larger tree. For Fig. 3 to 6 the scale bars represent 0.1 nucleotide substitution per site; the actual value depends on the branch lengths in the tree.