Fig. 1.

—Summary of plastid transcript editing in dinoflagellates. This diagram denotes the relationship between taxa under study, plastid affiliation, and presence of plastid biological features including minicircles, transcript polyuridylation, and transcript editing. Symbols are denoted in figure inset. Dashed line surrounding editing symbol between Amphidinium spp. and fucoxanthin lineages represents uncertainty regarding editing in basal peridinin dinoflagellates and related taxa. Placement of dashed boxes for both C-to-G and G-to-U base conversions in two places represents two alternate evolutionary hypotheses, as discussed in the main text. The single polytomy represents uncertainty in peridinin dinoflagellate branching order.