The Chromalveolata "supergroup" is a massive assemblage of single-celled and multicellular protists such as ciliates and kelps that remains to be substantiated in molecular trees. Recent multigene analyses place chromalveolates into two major clades, the SAR (Stramenopiles, Alveolata, and Rhizaria) and the Cryptophyta+Haptophyta. Here we determined 69 new sequences from different chromalveolates to study the interrelationships of its constituent phyla. We included in our trees, the novel groups Telonemia and Katablepharidophyta that have previously been described as chromalvoleate allies. The best phylogenetic resolution resulted from a 6-protein (actin, alpha-tubulin, beta-tubulin, cytosolic HSP70, BIP HSP70, HSP90) and a 5-protein (lacking HSP90) alignment that validated the SAR and cryptophyte+haptophyte clades with the inclusion of telonemids in the former and katablepharids in the latter. We assessed the Plastidophila hypothesis that is based on EF2 data and suggest this grouping may be explained by horizontal gene transfers involving the EF2 gene rather than indicating host relationships.
This research output has an Altmetric Attention Score of 3. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 03 May 2026.
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#21
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