Studies on a novel eukaryotic assemblage containing haptophytes and cryptophytes: Possible impact on the Chromalveolata hypothesis.

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Recent studies proposed a novel monophyletic assemblage of two of major eukaryotic algal groups, haptophytes and cryptophytes, together with miscellaneous heterotrophic species. In this study, we conducted deep mRNA sequencing on heterotrophic members of the haptophyte + cryptophyte (H + C) assemblage including an enigmatic heterotrophic flagellate Palpitomonas bilix. By analyzing the mRNA sequence data, we addressed three issues described below;(1) the diversity and detailed relationship between the phototrophic and heterotrophic members in H + C assemblage(2) the evolution of photosynthesis and plastids in H + C assemblage, and(3) the phylogenetic position of H + C assemblage in the tree of eukaryotes