| Halvaria | |
|---|---|
| Important halvarian groups. Clockwise from top-left: a water mold (Oomycetes), a brown alga (Phaeophyta), some diatoms (Bacillariophyta), some dinoflagellates (Miozoa), some ciliates (Ciliophora) and an opalinid (Bigyra). | |
Scientific classification  | |
| Domain: | Eukaryota |
| Clade: | Diaphoretickes |
| Clade: | Sar |
| Clade: | Halvaria Cavalier-Smith, 2010 |
| Unranked clades [1] | |
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| Synonyms | |
| |
Halvaria is a taxonomic grouping of protists that includes Alveolata and Stramenopiles (Heterokonta). Cavalier-Smith first proposed this group as "halvaria" instead of "Halvaria". [2]
Analyses in 2007 and 2008 revealed that the Stramenopiles and the Alveolata are related, and form a reduced clade of what were seen to be a paraphyletic group, the chromalveolates. The two clades together with the Rhizaria (originally one of the six major eukaryote groups) form a clade dubbed the SAR supergroup. [3] [4] [5]
A phylogenomic analysis from 2016 cast doubt on Halvaria, suggesting that Alveolata is the sister group to Rhizaria (making the R + A clade) through new rhizarian sequence data, and that support for Halvaria might be an artifact of low taxon sampling as well as long branch attraction. [6]
However, later analyses from 2021 support Halvaria as a solid clade. [7]
| SAR |
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