SAR or Harosa (informally the SAR supergroup) is a clade
that includes stramenopile
s, and Rhizaria
The name is an acronym
derived from the first letters of each of these clades; it has been alternatively spelled "RAS".
The term "Harosa" (at the subkingdom level) has also been used for this grouping by Cavalier-Smith
''et al.'' (2012) formalized the SAR supergroup as the node-based taxon
Sar. They defined it as:
Note that as a formal taxon, "Sar" has only its first letter capitalized, while the earlier abbreviation, SAR, retains all uppercase letters. Both names refer to the same group of organisms, unless further taxonomic revisions deem otherwise. Members of the SAR supergroup were once included under the separate supergroups Chromalveolata
) and Rhizaria
, until phylogenetic studies confirmed that stramenopiles and alveolates diverged with Rhizaria.
This apparently excluded haptophyte
s and cryptomonad
s, leading Okamoto ''et al.'' (2009) to propose the clade Hacrobia
to accommodate them.
Based on a compilation of the following works.