Fig. 2 in Absence of co-phylogeny indicates repeated diatom capture in dinophytes hosting a tertiary endosymbiont

Fig. 2 Polyphyletic endosymbionts of Durinskia, Galeidinium and Kryptoperidinium with closest relatives among free-ranging diatoms. Maximum likelihood (ML) tree (−ln = 14,945) of all 77 Bacillariaceae operational taxonomic units available, derived from the comparison of concatenated rRNA and plastid sequences. Highlighted endosymbiont taxa were scattered along up to ten only distantly related lineages over the Bacillariaceae phylogeny. Note that accessions of neither Durinskia nor Kryptoperidinium constituted monophyletic groups. Within such lineages, endosymbionts were usually closer related to free-ranging diatoms than to other endosymbionts (though statistical support was not always high). Some endosymbionts were phylogenetically isolated from free-living diatoms exhibiting long branches (e.g. D. kwazulunatalensis N.Yamada, Sym & T.Horig., D. oculata and G. rugatum Tam. & T.Horig.). Branch lengths are drawn to scale, with the scale bar indicating the number of nt substitutions per site. The numbers on the branches are statistical support values (ML bootstrap values, values <50 are not shown, posterior probabilities below branches, values <90 are not shown; asterisks indicate maximal support)