Discosea

Discosea
Thecamoeba striata
Scientific classification
Domain:	Eukaryota
(unranked):	Amoebozoa
(unranked):	Lobosa
(unranked):	Discosea Cavalier-Smith et al. 2004[1]
Subclasses and orders
Subclass Flabellinia Order Dactylopodida Order Himatismenida Order Pellitida Order Stygamoebida Order Trichosida Order Vanellida Subclass Longamoebia Order Dermamoebida Order Centramoebida Order Thecamoebida

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. There are no species that have flagella or flagellated stages of life.^[2][3]

The composition of Discosea is similar to that of the class Flabellinea, proposed by Alexey Smirnov and his collaborators in 2005.^[4] However, Discosea is a more comprehensive taxon, including several groups not included in Flabellinea.^[5] In 2011, Smirnov et al. accepted Discosea as a class, and reduced Flabellinea to the rank of a subclass with the name Flabellinia.^[2]

References

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. 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.
3. Adl, Sina M.; Simpson, Alastair G. B.; Lane, Christopher E.; Lukeš, Julius; Bass, David; Bowser, Samuel S.; Brown, Matthew W.; Burki, Fabien; Dunthorn, Micah (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. PMC 3483872. PMID 23020233.
4. 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.
5. "Catalogue of Organisms: Discosea: Keeping a Low Profile". coo.fieldofscience.com. Retrieved 2016-05-03.

External links

Discosea at Ferry Siemensma's Microworld

The order Hismatismenida at Penard.com