Apusozoa

Apusozoa
Apusomonas sp.
Apusomonas sp.
Scientific classification
(unranked):Obazoa
Phylum:Apusozoa
Cavalier-Smith 1997 em.
Orders

The Apusozoa are an Obazoa phylum[1] comprising several genera of flagellate eukaryotes. They are usually around 5–20 μm in size, and occur in soils and aquatic habitats, where they feed on bacteria. They are grouped together based on the presence of an organic shell or theca under the dorsal surface of the cell.

The name derives from the Ancient Greek words for footless (ἄπους) and animal (ζῷον).[2][3]

This phylum is currently defined as containing the Breviata and the Apusomonadida.[4][5] However, it currenly usually is viewed as paraphylectic, with the Breviata as more basal. The opisthokonts appear to have emerged as sister of the apusomonadida. It has been suggested that the Mantamonadida be classified in Apusozoa.[6][7]

The ancyromonadida appear to be Varisulca, Planomonadida, shifting them possibly more basal than the Amoebozoa.,[8][9][10] or less basal.[11] The Hemimastigida appear to be Rhizaria.

Characteristics

The apusomonads s have two flagella inserted at right angles, near the anterior of the cell. They move by gliding, with one flagellum trailing along the side and one directed to the anterior.

The form of the mitochondria varies between the different orders. Among the apusomonads they have tubular cristae, the ancyromonads flat cristae, and the hemimastigids ambiguous or sacculate cristae. This characteristic was originally considered a good indicator of relationships, but is now known to vary even among close relatives.

Eukaryotes

Bikonta

 

Archaeplastida

 
 

Hacrobia

 
 

SAR supergroup

 
 
 

Excavata

 
Podiata

 

Varisulca

 
Amorphea/

 

Amoebozoa

 
Obazoa

 

Breviatea

 
 

 

Apusomonadida

 
Opisthokonts

Holomycota

Zoosporia

 

Opisthosporidia

 
 

True Fungi

 
 
Cristidiscoidea

 

Nucleariida

 
 

Fonticulida

 
 
 
Holozoa

 

Ichthyosporea

 
 

Pluriformea

 

Syssomonas

 
 

Corallochytrium

 
 
Filozoa

 

Filasterea

 
Apoikozoa

 

Choanoflagellatea

 
 

Animalia

 
 
 
 
 
 
 
 
Unikonts
 
 

One view of the great kingdoms and their stem groups.[12]

References

  1. ↑ Cavalier-Smith T, Chao EE, Stechmann A, Oates B, Nikolaev S (October 2008). "Planomonadida ord. nov. (Apusozoa): ultrastructural affinity with Micronuclearia podoventralis and deep divergences within Planomonas gen. nov". Protist. 159 (4): 535–62. doi:10.1016/j.protis.2008.06.002. PMID 18723395.
  2. ↑ ἄπους. Liddell, Henry George; Scott, Robert; A Greek–English Lexicon at the Perseus Project
  3. ↑ ζῷον. Liddell, Henry George; Scott, Robert; A Greek–English Lexicon at the Perseus Project
  4. ↑ Eme, Laura; Sharpe, Susan C.; Brown, Matthew W.; Roger, Andrew J. (2014-08-01). "On the Age of Eukaryotes: Evaluating Evidence from Fossils and Molecular Clocks". Cold Spring Harbor Perspectives in Biology. 6 (8): a016139. doi:10.1101/cshperspect.a016139. ISSN 1943-0264. PMC 4107988. PMID 25085908.
  5. ↑ Ruggiero, Michael A.; Gordon, Dennis P.; Orrell, Thomas M.; Bailly, Nicolas; Bourgoin, Thierry; Brusca, Richard C.; Cavalier-Smith, Thomas; Guiry, Michael D.; Kirk, Paul M. (2015-06-11). "Correction: A Higher Level Classification of All Living Organisms". PLOS ONE. 10 (6): e0130114. doi:10.1371/journal.pone.0130114. ISSN 1932-6203. PMC 5159126. PMID 26068874.
  6. ↑ Glücksman E, Snell EA, Berney C, Chao EE, Bass D, Cavalier-Smith T (September 2010). "The Novel Marine Gliding Zooflagellate Genus Mantamonas (Mantamonadida ord. n.: Apusozoa)". Protist. 162 (2): 207–221. doi:10.1016/j.protis.2010.06.004. PMID 20884290.
  7. ↑ Orr, Russell J. S.; Zhao, Sen; Klaveness, Dag; Yabuki, Akinori; Ikeda, Keiji; Makoto, Watanabe M.; Shalchian-Tabrizi, Kamran (2017-10-08). "Enigmatic Diphyllatea eukaryotes: Culturing and targeted PacBio RS amplicon sequencing reveals a higher order taxonomic diversity and global distribution". bioRxiv 199125.
  8. ↑ Speijer, Dave; Lukeš, Julius; Eliáš, Marek (2015-07-21). "Sex is a ubiquitous, ancient, and inherent attribute of eukaryotic life". Proceedings of the National Academy of Sciences. 112 (29): 8827–8834. doi:10.1073/pnas.1501725112. ISSN 0027-8424. PMC 4517231. PMID 26195746.
  9. ↑ Torruella, Guifré; Mendoza, Alex de; Grau-Bové, Xavier; Antó, Meritxell; Chaplin, Mark A.; Campo, Javier del; Eme, Laura; Pérez-Cordón, Gregorio; Whipps, Christopher M. (2015). "Phylogenomics Reveals Convergent Evolution of Lifestyles in Close Relatives of Animals and Fungi". Current Biology. 25 (18): 2404–2410. doi:10.1016/j.cub.2015.07.053. PMID 26365255.
  10. ↑ Cavalier-Smith, Thomas; Chao, Ema E.; Snell, Elizabeth A.; Berney, Cédric; Fiore-Donno, Anna Maria; Lewis, Rhodri (2014). "Multigene eukaryote phylogeny reveals the likely protozoan ancestors of opisthokonts (animals, fungi, choanozoans) and Amoebozoa". Molecular Phylogenetics and Evolution. 81: 71–85. doi:10.1016/j.ympev.2014.08.012. PMID 25152275.
  11. ↑ Paps, Jordi; Medina-Chacón, Luis A.; Marshall, Wyth; Suga, Hiroshi; Ruiz-Trillo, Iñaki (2013). "Molecular Phylogeny of Unikonts: New Insights into the Position of Apusomonads and Ancyromonads and the Internal Relationships of Opisthokonts". Protist. 164 (1): 2–12. doi:10.1016/j.protis.2012.09.002. PMC 4342546. PMID 23083534.
  12. ↑ Phylogeny based on:
    • Eichinger, L.; Pachebat, J. A.; Glöckner, G.; Rajandream, M. A.; Sucgang, R.; Berriman, M.; Song, J.; Olsen, R.; et al. (2005). "The genome of the social amoeba Dictyostelium discoideum". Nature. 435 (7038): 43–57. doi:10.1038/nature03481. PMC 1352341. PMID 15875012.
    • Steenkamp, E. T.; Wright, J.; Baldauf, S. L. (2005). "The Protistan Origins of Animals and Fungi". Molecular Biology and Evolution. 23 (1): 93–106. doi:10.1093/molbev/msj011. PMID 16151185.
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