Figure 1.

Schematic phylogeny of eustigmatophytes showing the position of species with sequenced plastid genomes. The taxa with plastomes sequenced in this study are highlighted in bold. For the genera Nannochloropsis and Microchloropsis, only the type species are shown for simplicity, although plastomes have been sequenced for a number of other closely related species or strains. The topology of the tree reflects a robustly resolved phylogeny based on the 18S rRNA gene [14]. Evolutionary events impacting the gene content of eustigmatophyte plastid genomes are mapped onto the tree based on the most parsimonious interpretation of the pattern of the gene presence/absence (provided in the electronic supplementary material, table S1).