Halvaria

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]

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:	Sar
Clade:	Halvaria Cavalier-Smith, 2010
Unranked clades[1]
Stramenopiles (Heterokonta) Alveolata
Synonyms
halvaria Cavalier-Smith, 2010

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	Rhizaria Halvaria Stramenopiles Alveolata