The International Society of Protistologists, the recognised body for taxonomy of protozoa, recommended in 2012 that the term Unikont be changed to Amorphea because the name "Unikont" is based on a hypothesizedsynapomorphy that the ISOP authors and other scientists later rejected.[1][5]
Further work by Cavalier-Smith showed that Sulcozoa isparaphyletic.[10] Apusozoa also appears to be paraphyletic.Varisulca has been redefined to include planomonads,Mantamonas andCollodictyon. A new taxon has been created -Glissodiscea - for the planomonads andMantamonas. Again, the validity of this revised taxonomy awaits confirmation.
Amoebozoa seems to be monophyletic with two major branches:Conosa andLobosa. Conosa is divided into the aerobic infraphylumSemiconosia (Mycetozoa andVariosea) and secondarily anaerobicArchamoebae. Lobosa consists entirely of non-flagellated lobose amoebae and has been divided into two classes:Discosea, which have flattened cells, andTubulinea, which has predominantly tube-shaped pseudopodia.[11]
The group includeseukaryotic cells that, for the most part, have a single emergentflagellum, or are amoebae with no flagella. The unikonts includeopisthokonts (animals,fungi, and related forms) andAmoebozoa. By contrast, other well-known eukaryotic groups, which more often have two emergent flagella (although there are many exceptions), are often referred to asbikonts. Bikonts includeArchaeplastida (plants and relatives) andSAR supergroup, theCryptista,Haptista,Telonemia andPicozoa.
Cavalier-Smith[3] originally proposed that unikonts ancestrally had a single flagellum and singlebasal body. This is unlikely, however, as flagellated opisthokonts, as well as some flagellated Amoebozoa, includingBreviata, actually have two basal bodies, as in typical 'bikonts' (even though only one is flagellated in most unikonts). This paired arrangement can also be seen in the organization ofcentrioles in typical animal cells. In spite of the name of the group, the common ancestor of all 'unikonts' was probably a cell with two basal bodies.
^Cavalier-Smith T (May 2013). "Early evolution of eukaryote feeding modes, cell structural diversity, and classification of the protozoan phyla Loukozoa, Sulcozoa, and Choanozoa".Eur J Protistol.49 (2):115–78.doi:10.1016/j.ejop.2012.06.001.PMID23085100.
^Tikhonenkov, Denis V.; Mikhailov, Kirill V.; Gawryluk, Ryan M. R.; Belyaev, Artem O.; Mathur, Varsha; et al. (December 2022). "Microbial predators form a new supergroup of eukaryotes".Nature.612 (7941):714–719.doi:10.1038/s41586-022-05511-5.PMID36477531.S2CID254436650.
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