The placement of Hemimastigophora is uncertain. Some studies find it nested within the clades of Diaphoretickes, as the best supported hypothesis[3] or a less-supported one.[4] Others find it to be the sister group of all other Diaphoretickes,[4] which under the branch-based definition falls within Diaphoretickes.[2]
Diaphoretickes was identified by Burki et al. (2008) as the
"plants+HC+SAR megagroup".[5] because it included plants (Archaeplastida), haptophytes, cryptomonads, and stramenopiles, alveolates, and rhizarians. Diaphoretickes has been called the SAR/HA Supergroup or "Corticata with Rhizaria".[6] According to this description, it includes most of the species engaging in photosynthesis, except for the Euglenozoa and Cyanobacteria. It includes all Bikonts that are not excavates. The name "Corticata" comes from Cavalier-Smith's hypothesis about the common origin of the cortical alveoli of glaucophytes and alveolates.[7] The megagroup was previously described as the sum of Archaeplastida, Rhizaria, and chromalveolates.[8] However, this description is obsolete, largely due to the discovery that Chromalveolata, a refinement of Chromista, is not monophyletic.[9][10]
^Cavalier-Smith T (January 2003). "Protist phylogeny and the high-level classification of Protozoa". European Journal of Protistology. 39 (4): 338–348. doi:10.1078/0932-4739-00002.
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