Consensus best scoring tree topology with RaxML under GTR, JTT, and WAG substitution models for a 3,942 branch × 240 aa alignments of all DUF347 domains (PF03988) sampled from Uniref, JGI algal genomes, MMETSP, and MATOUs from Tara Oceans. Branches are shaded by taxonomy and leaf nodes by biogeographic providence. Thicker branches indicate the presence of a clade in all three best scoring tree outputs. Top: overview of the global topology. Bottom: topology of two clades containing the bipolar dinoflagellate Scrippsiella and (i) Pavlovales sp. CCMP2436 or (ii) the Antarctic cryptomonad Geminigera. Support values for two nodes linking the Arctic or Antarctic algal genes and meta-genes are indicated by the blue circles.