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Amastigomonas is a genus of protists belonging to a lineage of biciliatedzooflagellates known as Apusomonadida. It was first described in 1931 by Henri de Saedeleer. The current use of Amastigomonas is as a descriptive archetype, with no phylogenetic or taxonomic implications. The term "Amastigomonas-like" is used to refer to all apusomonads that lack the 'derived' characteristics of Apusomonas.
Description
Organisms under the name "Amastigomonas" have an oval or oblong cell that can generate pseudopodia from the ventral surface. They lack a mastigophore, a projection of the cell body that contains both basal bodies at its end. Like all Apusomonadida, they have two flagella, and the anterior flagellum is surrounded by a membranous sleeve.
Current use of the name
Historically, the name Amastigomonas was used for any apusomonad species that had 'primitive' characteristics compared to the more 'derived' characteristics of Apusomonas. Molecular phylogenetic analyses have shown that Apusomonas branches inside Amastigomonas, making this genus paraphyletic. As a result, many species of Amastigomonas have been reassigned to new genera—Thecamonas, Podomonas, Manchomonas, Multimonas, Chelonemonas, Catacumbia, Cavaliersmithia, Karpovia, Mylnikovia and Singekia—, and no currently cultured apusomonad matches the original description of Amastigomonas.
^ de Saedeleer H (1931). "Niewe of weinig bekende Flagellaten" [New or little known Flagellates]. Natuurwetenschappelijk Tijdschrift (in Dutch). 13: 89–97.
^ Torruella G, Galindo LJ, Moreira D, Ciobanu M, Heiss AA, Yubuki N, et al. (2022). "Expanding the molecular and morphological diversity of Apusomonadida, a deep-branching group of gliding bacterivorous protists". Journal of Eukaryotic Microbiology. 00: e12956. doi:10.1111/jeu.12956. hdl:2117/404026.
Cavalier-Smith T, Chao EE (May 2010). "Phylogeny and Evolution of Apusomonadida (Protozoa: Apusozoa): New Genera and Species". Protist. 161 (4): 549–76. doi:10.1016/j.protis.2010.04.002. PMID20537943.
^ Heiss AA, Lee WJ, Ishida KI, Simpson AGB (2015). "Cultivation and Characterisation of New Species of Apusomonads (the Sister Group to Opisthokonts), Including Close Relatives of Thecamonas (Chelonemonas n. gen.)". Journal of Eukaryotic Microbiology. 62: 637–649. doi:10.1111/jeu.12220.
Mylnikov AP, Mylnikova ZM (2012). "НОВЫЙ ПСЕВДОПОДИАЛЬНЫЙ ЖГУТИКОНОСЕЦ AMASTIGOMONAS MARISRUBRI (APUSOMONADIDA) ИЗ КРАСНОГО МОРЯ" [A NEW PSEUDOPODIAL FLAGELLATE AMASTIGOMONAS MARISRUBRI (APUSOMONADIDA) FROM THE RED SEA]. Зоологический журнал (Zoological Journal) (in Russian). 91 (4): 387–387.
