Biology:Discosea

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Short description: Class of amoebae

Discosea
Parasite140120-fig3 Acanthamoeba keratitis.png
Acanthamoeba sp.
Scientific classification e
Domain: Eukaryota
Phylum: Amoebozoa
Subphylum: Lobosa
Class: Discosea
Cavalier-Smith et al. 2004[1]
Subclasses and orders[2]

Discosea is a class of Amoebozoa, consisting of naked amoebae with a flattened, discoid body shape.[1] Members of the group do not produce tubular or subcylindrical pseudopodia, like amoebae of the class Tubulinea. When a discosean is in motion, a transparent layer called hyaloplasm forms at the leading edge of the cell (see lamelliopodium). In some discoseans, short "subpseudopodia" may be extended from this hyaloplasm, but the granular contents of the cell do not flow into these, as in true pseudopodia. Discosean amoebae lack hard shells, but some, like Cochliopodium and Korotnevella secrete intricate organic scales which may cover the upper (dorsal) surface of the cell. No species have flagella or flagellated stages of life.[3][4]

The composition of Discosea is similar to that of the class Flabellinea, proposed by Alexey Smirnov and his collaborators in 2005.[5] However, Discosea is a more comprehensive taxon, including several groups not included in Flabellinea.[6] In 2011, Smirnov et al. accepted Discosea as a class, and reduced Flabellinea to the rank of a subclass with the name Flabellinia.[3]

Taxonomy

Class Discosea Cavalier-Smith 2004 stat. nov. Adl et al. 2018[7]

  • Order ?Hyalodiscida
  • Order ?Stereomyxida Grell 1971
    • Family Stereomyxidae Grell 1966
  • Order ?Stygamoebida Smirnov & Cavalier-Smith 2011
    • Family Stygamoebidae Cavalier-Smith & Smirnov 2011
  • Subclass Centramoebia Cavalier-Smith et al. 2016
  • Subclass Flabellinia Smirnov & Cavalier-Smith 2011 em. Kudryavtsev et al. 2014
    • Order Dactylopodida Smirnov et al. 2005
      • Family Paramoebidae Poche 1913 em. Kudryavtsev, Pawlowski & Hausmann 2011
      • Family Vexilliferidae Page 1987 em. Kudryavtsev, Pawlowski & Hausmann 2011
    • Order Dermamoebida Cavalier-Smith 2004 em. Smirnov & Cavalier-Smith 2011
      • Family Dermamoebidae Cavalier-Smith & Smirnov 2011 (Lingulate amoeba)
      • Family Mayorellidae Schaeffer 1926 em. Smirnov et al. 2011
    • Order Thecamoebida Schaeffer 1926 em. Smirnov & Cavalier-Smith 2011
      • Family Stenamoebidae Cavalier-Smith 2016
      • Family Thecamoebidae Chatton 1925 em. Smirnov et al. 2011 (striate & rugose amoeba)
    • Order Vannellida Smirnov et al. 2005
      • Family Discamoebidae Bovee & Jahn, 1967 ex Jahn, Bovee & Griffith 1974
      • Family Vannellidae (Bovee, 1970)

References

  1. 1.0 1.1 Cavalier-Smith, Thomas; Chao, Ema E. -Y.; Oates, Brian (2004-05-18). "Molecular phylogeny of Amoebozoa and the evolutionary significance of the unikont Phalansterium". European Journal of Protistology 40 (1): 21–48. doi:10.1016/j.ejop.2003.10.001. 
  2. "Between a Pod and a Hard Test: The Deep Evolution of Amoebae". Molecular Biology and Evolution 34 (9): 2258–2270. September 2017. doi:10.1093/molbev/msx162. PMID 28505375. 
  3. 3.0 3.1 Smirnov, Alexey V.; Chao, Ema; Nassonova, Elena S.; Cavalier-Smith, Thomas (2011-10-01). "A revised classification of naked lobose amoebae (Amoebozoa: lobosa)". Protist 162 (4): 545–570. doi:10.1016/j.protis.2011.04.004. ISSN 1618-0941. PMID 21798804. 
  4. Adl, Sina M.; Simpson, Alastair G. B.; Lane, Christopher E.; Lukeš, Julius; Bass, David; Bowser, Samuel S.; Brown, Matthew W.; Burki, Fabien et al. (2012-09-01). "The revised classification of eukaryotes". The Journal of Eukaryotic Microbiology 59 (5): 429–493. doi:10.1111/j.1550-7408.2012.00644.x. ISSN 1550-7408. PMID 23020233. 
  5. Smirnov, Alexey; Nassonova, Elena; Berney, Cédric; Fahrni, José; Bolivar, Ignacio; Pawlowski, Jan (2005-08-01). "Molecular phylogeny and classification of the lobose amoebae". Protist 156 (2): 129–142. doi:10.1016/j.protis.2005.06.002. ISSN 1434-4610. PMID 16171181. 
  6. "Catalogue of Organisms: Discosea: Keeping a Low Profile". http://coo.fieldofscience.com/2009/09/discosea-keeping-low-profile.html. 
  7. Adl, Sina M.; Bass, David; Lane, Christopher E.; Lukeš, Julius; Schoch, Conrad L.; Smirnov, Alexey; Agatha, Sabine; Berney, Cedric et al. (2018-09-26). "Revisions to the Classification, Nomenclature, and Diversity of Eukaryotes". Journal of Eukaryotic Microbiology 66 (1): 4–119. doi:10.1111/jeu.12691. PMID 30257078. 

External links

Discosea at Ferry Siemensma's Microworld  The order Hismatismenida at Penard.com

Wikidata ☰ Q14593772 entry