Fig. 1
a Schematic view of the Eukaryotic tree, redrawn from [73]. The coloured groupings correspond to the currently recognised ‘supergroups’. Unresolved branching orders among lineages are shown as multifurcations. Broken lines reflect lesser uncertainties about the monophyly of certain groups. Asterisks represent lineages where complex multicellularity emerged. Ectocarpus is a brown alga, belonging to the Stramenopila (indicated with an arrowhead). b Ectocarpus sp. gametophyte (asterisk) in the field growing on the brown alga Scytosiphon lomentaria (arrowhead) (https://www.algaebase.org/search/species/detail/?tc=accept&species_id=76)