Fig. 5.

Number of gene families and conserved dark genes in Suessiales. a Tree topology shows the phylogenetic relationship of the 15 Suessiales isolates, follows the species tree inferred based on 28,116 gene families containing four or more sequences from any isolates, rooted with P. glacialis as outgroup to Symbiodiniaceae. At each node, the total number of families that include genes from all diverging isolates (and not others) is shown; the proportion of dark genes among all genes in these families are shown as a pie chart. b Number of isolate-specific gene families for each isolate, showing the proportion of families that are dark. c Number of gene families specific to Symbiodiniaceae, Symbiodinium, and other genera