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Arcella
''Arcella'' is a genus of testate amoebae in the order Arcellinida, usually found in freshwaters and mosses, and rarely in soils. A key characteristic of ''Arcella'' is the circular test with a hole on its center from where finger-like pseudopods emerge. It is one of the largest testacean genera. Anatomy An ''Arcella'' is typically enclosed in a chitinous, umbrella-shaped test (or shell) that has a single central aperture through which the pseudopods – which are used for locomotion – extend out. In some species the aperture is surrounded by a ring of pores. The test is composed of organic material with a diameter of up to 300 µm and is transparent or light-yellow-colored in young ''Arcella'', but browns while aging due to the progressive deposition of iron and manganese compounds.Ralf Meisterfeld and Edward Mitchell (2008)"''Arcella'' Ehrenberg 1832" Contrary to other genera, no gravel chips or other foreign bodies are inserted to strengthen the housing. Different spec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arcella Dentata
''Arcella'' is a genus of testate amoebae in the order Arcellinida, usually found in freshwaters and mosses, and rarely in soils. A key characteristic of ''Arcella'' is the circular Test (biology), test with a hole on its center from where finger-like pseudopods emerge. It is one of the largest testacean genera. Anatomy An ''Arcella'' is typically enclosed in a chitinous, umbrella-shaped Test (biology), test (or shell) that has a single central aperture through which the pseudopods – which are used for locomotion – extend out. In some species the aperture is surrounded by a ring of pores. The test is composed of organic material with a diameter of up to 300 µm and is transparent or light-yellow-colored in young ''Arcella'', but browns while aging due to the progressive deposition of iron and manganese compounds.Ralf Meisterfeld and Edward Mitchell (2008)"''Arcella'' Ehrenberg 1832" Contrary to other genera, no gravel chips or other foreign bodies are inserted to strengt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arcella Costata
''Arcella'' is a genus of testate amoebae in the order Arcellinida, usually found in freshwaters and mosses, and rarely in soils. A key characteristic of ''Arcella'' is the circular test with a hole on its center from where finger-like pseudopods emerge. It is one of the largest testacean genera. Anatomy An ''Arcella'' is typically enclosed in a chitinous, umbrella-shaped test (or shell) that has a single central aperture through which the pseudopods – which are used for locomotion – extend out. In some species the aperture is surrounded by a ring of pores. The test is composed of organic material with a diameter of up to 300 µm and is transparent or light-yellow-colored in young ''Arcella'', but browns while aging due to the progressive deposition of iron and manganese compounds.Ralf Meisterfeld and Edward Mitchell (2008)"''Arcella'' Ehrenberg 1832" Contrary to other genera, no gravel chips or other foreign bodies are inserted to strengthen the housing. Different spec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arcella Conica
''Arcella'' is a genus of testate amoebae in the order Arcellinida, usually found in freshwaters and mosses, and rarely in soils. A key characteristic of ''Arcella'' is the circular test with a hole on its center from where finger-like pseudopods emerge. It is one of the largest testacean genera. Anatomy An ''Arcella'' is typically enclosed in a chitinous, umbrella-shaped test (or shell) that has a single central aperture through which the pseudopods – which are used for locomotion – extend out. In some species the aperture is surrounded by a ring of pores. The test is composed of organic material with a diameter of up to 300 µm and is transparent or light-yellow-colored in young ''Arcella'', but browns while aging due to the progressive deposition of iron and manganese compounds.Ralf Meisterfeld and Edward Mitchell (2008)"''Arcella'' Ehrenberg 1832" Contrary to other genera, no gravel chips or other foreign bodies are inserted to strengthen the housing. Different spec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arcellidae
''Arcella'' is a genus of testate amoebae in the order Arcellinida, usually found in freshwaters and mosses, and rarely in soils. A key characteristic of ''Arcella'' is the circular test with a hole on its center from where finger-like pseudopods emerge. It is one of the largest testacean genera. Anatomy An ''Arcella'' is typically enclosed in a chitinous, umbrella-shaped test (or shell) that has a single central aperture through which the pseudopods – which are used for locomotion – extend out. In some species the aperture is surrounded by a ring of pores. The test is composed of organic material with a diameter of up to 300 µm and is transparent or light-yellow-colored in young ''Arcella'', but browns while aging due to the progressive deposition of iron and manganese compounds.Ralf Meisterfeld and Edward Mitchell (2008)"''Arcella'' Ehrenberg 1832" Contrary to other genera, no gravel chips or other foreign bodies are inserted to strengthen the housing. Different spec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arcella Catinus
''Arcella'' is a genus of testate amoebae in the order Arcellinida, usually found in freshwaters and mosses, and rarely in soils. A key characteristic of ''Arcella'' is the circular test with a hole on its center from where finger-like pseudopods emerge. It is one of the largest testacean genera. Anatomy An ''Arcella'' is typically enclosed in a chitinous, umbrella-shaped test (or shell) that has a single central aperture through which the pseudopods – which are used for locomotion – extend out. In some species the aperture is surrounded by a ring of pores. The test is composed of organic material with a diameter of up to 300 µm and is transparent or light-yellow-colored in young ''Arcella'', but browns while aging due to the progressive deposition of iron and manganese compounds.Ralf Meisterfeld and Edward Mitchell (2008)"''Arcella'' Ehrenberg 1832" Contrary to other genera, no gravel chips or other foreign bodies are inserted to strengthen the housing. Different spec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arcella Sp
''Arcella'' is a genus of testate amoebae in the order Arcellinida, usually found in freshwaters and mosses, and rarely in soils. A key characteristic of ''Arcella'' is the circular test with a hole on its center from where finger-like pseudopods emerge. It is one of the largest testacean genera. Anatomy An ''Arcella'' is typically enclosed in a chitinous, umbrella-shaped test (or shell) that has a single central aperture through which the pseudopods – which are used for locomotion – extend out. In some species the aperture is surrounded by a ring of pores. The test is composed of organic material with a diameter of up to 300 µm and is transparent or light-yellow-colored in young ''Arcella'', but browns while aging due to the progressive deposition of iron and manganese compounds.Ralf Meisterfeld and Edward Mitchell (2008)"''Arcella'' Ehrenberg 1832" Contrary to other genera, no gravel chips or other foreign bodies are inserted to strengthen the housing. Different s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arcella Brasiliensis
''Arcella'' is a genus of testate amoebae in the order Arcellinida, usually found in freshwaters and mosses, and rarely in soils. A key characteristic of ''Arcella'' is the circular test with a hole on its center from where finger-like pseudopods emerge. It is one of the largest testacean genera. Anatomy An ''Arcella'' is typically enclosed in a chitinous, umbrella-shaped test (or shell) that has a single central aperture through which the pseudopods – which are used for locomotion – extend out. In some species the aperture is surrounded by a ring of pores. The test is composed of organic material with a diameter of up to 300 µm and is transparent or light-yellow-colored in young ''Arcella'', but browns while aging due to the progressive deposition of iron and manganese compounds.Ralf Meisterfeld and Edward Mitchell (2008)"''Arcella'' Ehrenberg 1832" Contrary to other genera, no gravel chips or other foreign bodies are inserted to strengthen the housing. Different spec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arcella Artocrea
''Arcella'' is a genus of testate amoebae in the order Arcellinida, usually found in freshwaters and mosses, and rarely in soils. A key characteristic of ''Arcella'' is the circular test with a hole on its center from where finger-like pseudopods emerge. It is one of the largest testacean genera. Anatomy An ''Arcella'' is typically enclosed in a chitinous, umbrella-shaped test (or shell) that has a single central aperture through which the pseudopods – which are used for locomotion – extend out. In some species the aperture is surrounded by a ring of pores. The test is composed of organic material with a diameter of up to 300 µm and is transparent or light-yellow-colored in young ''Arcella'', but browns while aging due to the progressive deposition of iron and manganese compounds.Ralf Meisterfeld and Edward Mitchell (2008)"''Arcella'' Ehrenberg 1832" Contrary to other genera, no gravel chips or other foreign bodies are inserted to strengthen the housing. Different spec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arcella Arenaria
''Arcella'' is a genus of testate amoebae in the order Arcellinida, usually found in freshwaters and mosses, and rarely in soils. A key characteristic of ''Arcella'' is the circular test with a hole on its center from where finger-like pseudopods emerge. It is one of the largest testacean genera. Anatomy An ''Arcella'' is typically enclosed in a chitinous, umbrella-shaped test (or shell) that has a single central aperture through which the pseudopods – which are used for locomotion – extend out. In some species the aperture is surrounded by a ring of pores. The test is composed of organic material with a diameter of up to 300 µm and is transparent or light-yellow-colored in young ''Arcella'', but browns while aging due to the progressive deposition of iron and manganese compounds.Ralf Meisterfeld and Edward Mitchell (2008)"''Arcella'' Ehrenberg 1832" Contrary to other genera, no gravel chips or other foreign bodies are inserted to strengthen the housing. Different spec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arcella Megastoma
''Arcella'' is a genus of testate amoebae in the order Arcellinida, usually found in freshwaters and mosses, and rarely in soils. A key characteristic of ''Arcella'' is the circular test with a hole on its center from where finger-like pseudopods emerge. It is one of the largest testacean genera. Anatomy An ''Arcella'' is typically enclosed in a chitinous, umbrella-shaped test (or shell) that has a single central aperture through which the pseudopods – which are used for locomotion – extend out. In some species the aperture is surrounded by a ring of pores. The test is composed of organic material with a diameter of up to 300 µm and is transparent or light-yellow-colored in young ''Arcella'', but browns while aging due to the progressive deposition of iron and manganese compounds.Ralf Meisterfeld and Edward Mitchell (2008)"''Arcella'' Ehrenberg 1832" Contrary to other genera, no gravel chips or other foreign bodies are inserted to strengthen the housing. Different spec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Testate Amoebae
Testate amoebae (formerly thecamoebians, Testacea or Thecamoeba) are a polyphyletic group of unicellular amoeboid protists, which differ from naked amoebae in the presence of a test that partially encloses the cell, with an aperture from which the pseudopodia emerge, that provides the amoeba with shelter from predators and environmental conditions. The test of some species is produced entirely by the amoeba and may be organic, siliceous or calcareous depending on the species (autogenic tests), whereas in other cases the test is made up of particles of sediment collected by the amoeba which are then agglutinated together by secretions from within the cell (xenogenic tests). A few taxa (Hyalosphenidae) can build either type, depending on the circumstances and availability of foreign material. The assemblage referred to as "testate amoebae" is actually composed of several, unrelated groups of organisms. However, some features they all share that have been used to group them together ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 classification schemes, Amoebozoa is ranked as a phylum within either the kingdom Protista or the kingdom Protozoa. In the classification favored by the International Society of Protistologists, it is retained as an unranked " supergroup" within Eukaryota. Molecular genetic analysis supports Amoebozoa as a monophyletic clade. Modern studies of eukaryotic phylogenetic trees identify it as the sister group to Opisthokonta, another major clade which contains both fungi and animals as well as several other clades comprising some 300 species of unicellular eukaryotes. Amoebozoa and Opisthokonta are sometimes grouped together in a high-level taxon, variously named Unikonta, Amorphea or Opimoda. Amoebozoa includes many of the best-known amoeboid orga ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
