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I have found that recently these are considered as phylum. In this wiki species, https://species.wikimedia.org/wiki/Retaria, Cavalier-Smith (2002) stated that it's a phylum, and it seems that it more fits to other wiki articles. Since I'm not sure what guidance Wikipedia's taxonomy template follows, I just request for an edit here to reflect these. Or please explain me about what taxonomy project follows. Thank you, Luke Kern Choi 5 (talk) 06:48, 8 December 2020 (UTC)[reply]
Hi Luke, to answer your question directly, the current taxonomy of Retaria on Wikipedia follows the latest publications of Cavalier-Smith such as this one, where Retaria is considered a phylum. The "superphylum", or more accurately infrakingdom, here would be Rhizaria, which Retaria is a part of.
For future reference, you can type in the url "en.wikipedia.org/wiki/Template:Taxonomy/Retaria" (or whatever taxon you want instead of Retaria) and check out the taxonomic references that are used.