Discosea is a

class Class or The Class may refer to: Common uses not otherwise categorized * Class (biology), a taxonomic rank * Class (knowledge representation), a collection of individuals or objects * Class (philosophy), an analytical concept used differentl ...

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 traditional and currently no longer supported classi ...

, consisting of naked amoebae with a flattened, discoid body shape. Members of the group do not produce tubular or subcylindrical

pseudopodia A pseudopod or pseudopodium (plural: pseudopods or pseudopodia) is a temporary arm-like projection of a eukaryotic cell membrane that is emerged in the direction of movement. Filled with cytoplasm, pseudopodia primarily consist of actin filament ...

, 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 ''Cochliopodium'' is a Himatismenida genus. It has been found in eyewash stations. It includes: * ''C. actinophorum'' (Auerbach 1856) Page 1976 * ?''C. ambiguum'' Penard 1904 * ''C. arabianum'' Tekle, Gorfu & Anderson 2015 * ''C. barki'' Kudry ...

'' and ''

Korotnevella ''Korotnevella'' is a genus of Amoebozoa.EOL EOL or Eol may refer to: * Encyclopedia of Life, a freely-accessible, online collaborative bio-encyclopedia * End-of-life (product), a term used with respect to terminating the sale or support of goo ...

'' 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 nam ...

, 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 tradition ...

'' 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 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 ...

Cavalier-Smith & Smirnov 2011 * Subclass

Centramoebia 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 ...

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 ''Balamuthia mandrillaris'' is a free-living amoeba that causes the rare but deadly neurological condition granulomatous amoebic encephalitis (GAE). ''B. mandrillaris'' is a soil-dwelling amoeba and was first discovered in 1986 in the brain of a ...

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 Himatismenida is an Amoebozoa order, in the class Discosea, along with Glycostylida and Dermamoebida. It contains species such as ''Cochliopodium ''Cochliopodium'' is a Himatismenida genus. It has been found in eyewash stations. It includes ...

Page 1987 ochliopodiida*** Family

Parvamoebidae Himatismenida is an Amoebozoa order, in the class Discosea, along with Glycostylida and Dermamoebida Discosea is a class of Amoebozoa, consisting of naked amoebae with a flattened, discoid body shape. Members of the group do not produce tu ...

Cavalier-Smith & Smirnov 2011 *** Family

Cochliopodiidae Himatismenida is an Amoebozoa order, in the class Discosea, along with Glycostylida and Dermamoebida Discosea is a class of Amoebozoa, consisting of naked amoebae with a flattened, discoid body shape. Members of the group do not produce tu ...

Taranek 1882 ** Order

Pellitida 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 1987 *** Family

Pellitidae 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 ...

Smirnov & Kudryavtsev 2005 *** Family

Goceviidae 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 * Subclass

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 Paramoebidae is a family of Amoebozoa, classified under Dactylopodida. It has also been classified under gymnamoebae. It includes the genera ''Korotnevella'', ''Hollandella'', and ''Paramoeba''. References

Amoebozoa families Discosea { ...

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 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 ...

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