Discosea is a
class of
Amoebozoa, consisting of naked amoebae with a flattened, discoid body shape.
Members of the group do not produce tubular or
subcylindrical pseudopodia, like amoebae of the class
Tubulinea
The Tubulinea are a major grouping of Amoebozoa, including most of the more familiar amoebae genera like ''Amoeba'', '' Arcella'', ''Difflugia'' and '' Hartmannella''.
Characteristics
During locomotion most Tubulinea have a roughly cylindrical f ...
. 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.
The composition of Discosea is similar to that of the class Flabellinea, proposed by Alexey Smirnov and his collaborators in 2005.
However, Discosea is a more comprehensive
taxon
In biology, a taxon ( back-formation from '' taxonomy''; plural taxa) is a group of one or more populations of an organism or organisms seen by taxonomists to form a unit. Although neither is required, a taxon is usually known by a particular n ...
, including several groups not included in Flabellinea.
In 2011, Smirnov et al. accepted Discosea as a class, and reduced Flabellinea to the rank of a subclass with the name
Flabellinia
The Flabellinia are a subclass of Amoebozoa. During locomotion the cells are flattened and have a clear layer called ''hyaloplasm'' along the front margin. Some form slender subpseudopodia projecting outward from the hyaloplasm, but the cell ma ...
.
File:Parasite140120-fig3 Acanthamoeba keratitis Figure 3B.png, ''Acanthamoeba
''Acanthamoeba'' is a genus of amoebae that are commonly recovered from soil, fresh water, and other habitats.
''Acanthamoeba'' has two evolutive forms, the metabolically active trophozoite and a dormant, stress-resistant cyst. Trophozoites are ...
'' sp.
File:Thecamoeba striata001.JPG, ''Thecamoeba
''Thecamoeba ''is a genus of Amoebozoa
Amoebozoa is a major taxonomic group containing about 2,400 described species of amoeboid protists, often possessing blunt, fingerlike, lobose pseudopods and tubular mitochondrial cristae. In trad ...
'' sp.
File:Строение амебы Mayorella sp.jpg, ''Mayorella'' (Amoebozoa, Discosea)
Taxonomy
Class Discosea
Cavalier-Smith 2004 stat. nov. Adl et al. 2018
* Order ?
Hyalodiscida
Discosea is a class of Amoebozoa, consisting of naked amoebae with a flattened, discoid body shape. Members of the group do not produce tubular or subcylindrical pseudopodia, like amoebae of the class Tubulinea. When a discosean is in motion, ...
** Family
Hyalodiscidae
Discosea is a class of Amoebozoa, consisting of naked amoebae with a flattened, discoid body shape. Members of the group do not produce tubular or subcylindrical pseudopodia, like amoebae of the class Tubulinea. When a discosean is in motion, ...
Page 1976 non Poche 1913
* Order ?
Stereomyxida Grell 1971
** Family
Stereomyxidae Grell 1966
* Order ?
Stygamoebida
The Flabellinia are a subclass of Amoebozoa. During locomotion the cells are flattened and have a clear layer called ''hyaloplasm'' along the front margin. Some form slender subpseudopodia projecting outward from the hyaloplasm, but the cell m ...
Smirnov & Cavalier-Smith 2011
** Family
Stygamoebidae Cavalier-Smith & Smirnov 2011
* Subclass
Centramoebia Cavalier-Smith et al. 2016
** Order
Centramoebida
Discosea is a class of Amoebozoa, consisting of naked amoebae with a flattened, discoid body shape. Members of the group do not produce tubular or subcylindrical pseudopodia, like amoebae of the class Tubulinea. When a discosean is in motion, a ...
Rogerson & Patterson 2002 em. Cavalier-Smith 2004
*** Family
Balamuthiidae Cavalier-Smith 2004
*** Family
Acanthamoebidae
Acanthamoebidae is a family of single-celled eukaryotes within the group Amoebozoa.
It gets its name from ''Acanthamoeba'', its best-known member. However, it also includes other species, such as '' Comandonia operculata'' and '' Protacanthamoeba ...
Sawyer & Griffin 1975 em. Tice et al. 2016
** Order
Himatismenida Page 1987 ochliopodiida*** Family
Parvamoebidae Cavalier-Smith & Smirnov 2011
*** Family
Cochliopodiidae Taranek 1882
** Order
Pellitida Page 1987
*** Family
Pellitidae
Discosea is a Class (biology), class of Amoebozoa, consisting of naked amoebae with a flattened, discoid body shape. Members of the group do not produce tubular or subcylindrical pseudopodia, like amoebae of the class Tubulinea. When a discosean ...
Smirnov & Kudryavtsev 2005
*** Family
Goceviidae Cavalier-Smith & Smirnov 2011
* Subclass
Flabellinia
The Flabellinia are a subclass of Amoebozoa. During locomotion the cells are flattened and have a clear layer called ''hyaloplasm'' along the front margin. Some form slender subpseudopodia projecting outward from the hyaloplasm, but the cell ma ...
Smirnov & Cavalier-Smith 2011 em. Kudryavtsev et al. 2014
** Order
Dactylopodida
Dactylopodida is an Amoebozoa grouping.
References
Amoebozoa orders
Discosea
{{Amoebozoa-stub ...
Smirnov et al. 2005
*** Family
Paramoebidae Poche 1913 em. Kudryavtsev, Pawlowski & Hausmann 2011
*** Family
Vexilliferidae Page 1987 em. Kudryavtsev, Pawlowski & Hausmann 2011
** Order
Dermamoebida
Discosea is a class of Amoebozoa, consisting of naked amoebae with a flattened, discoid body shape. Members of the group do not produce tubular or subcylindrical pseudopodia, like amoebae of the class Tubulinea. When a discosean is in motion, ...
Cavalier-Smith 2004 em. Smirnov & Cavalier-Smith 2011
*** Family
Dermamoebidae
Discosea is a class of Amoebozoa, consisting of naked amoebae with a flattened, discoid body shape. Members of the group do not produce tubular or subcylindrical pseudopodia, like amoebae of the class Tubulinea. When a discosean is in motion, ...
Cavalier-Smith & Smirnov 2011 (Lingulate amoeba)
*** Family
Mayorellidae Schaeffer 1926 em. Smirnov et al. 2011
** Order
Thecamoebida
Discosea is a class of Amoebozoa, consisting of naked amoebae with a flattened, discoid body shape. Members of the group do not produce tubular or subcylindrical pseudopodia, like amoebae of the class Tubulinea. When a discosean is in motion, a ...
Schaeffer 1926 em. Smirnov & Cavalier-Smith 2011
*** Family
Stenamoebidae Cavalier-Smith 2016
*** Family
Thecamoebidae
Thecamoebidae is an Amoebozoa family.
'' Dermamoeba'' has been classified in this group. However, there is recent evidence that it is not closely related to the other members of this group.
See also
* '' Sappinia diploidea''
References
...
Chatton 1925 em. Smirnov et al. 2011 (striate & rugose amoeba)
** Order
Vannellida
The Vannellidae are a family of Amoebozoa, which are found in soil, fresh- and salt water. The most common genus is ''Vannella''.
Description
''Vannellidae'' tend to be flattened and fan-shaped during motion, although some are long and narrow, a ...
Smirnov et al. 2005
*** Family
Discamoebidae Bovee & Jahn, 1967 ex Jahn, Bovee & Griffith 1974
*** Family
Vannellidae
The Vannellidae are a family of Amoebozoa, which are found in soil, fresh- and salt water. The most common genus is ''Vannella''.
Description
''Vannellidae'' tend to be flattened and fan-shaped during motion, although some are long and narrow, a ...
(Bovee, 1970)
References
External links
Discosea at Ferry Siemensma's MicroworldThe order Hismatismenida at Penard.com
Amoebozoa classes
Taxa named by Thomas Cavalier-Smith
{{Amoebozoa-stub