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Vitreochlamys
''Vitreochlamys'' is a genus of green algae in the family Chlamydomonadaceae.See the NCBIbr>webpage on Vitreochlamys Data extracted from the It is sometimes known by the name ''Sphaerellopsis'', published by Aleksandr Arkadievich Korshikov. However, that name is an illegitimate later homonym, preceded by ''Sphaerellopsis'' . It is commonly found in freshwater habitats. ''Vitreochlamys'' is a unicellular, free-living organism. Cells are spherical, ovoidal, or ellipsoidal, with two equal flagella at one end, and two or three contractile vacuoles at the base of the flagella. The cell wall is swollen, giving the appearance of a layer surrounding the protoplast. Cells contain a single large chloroplast filling the cell, with pyrenoids and a stigma. Asexual reproduction occurs by the formation of zoospores within the parent cell wall; sexual reproduction has not been observed. Species are distinguished from each other by their cell shape, number of contractile vacuoles and py ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vitreochlamys Aulata
''Vitreochlamys'' is a genus of green algae in the family Chlamydomonadaceae.See the NCBIbr>webpage on Vitreochlamys Data extracted from the It is sometimes known by the name ''Sphaerellopsis'', published by Aleksandr Arkadievich Korshikov. However, that name is an illegitimate later homonym, preceded by ''Sphaerellopsis'' . It is commonly found in freshwater habitats. ''Vitreochlamys'' is a unicellular, free-living organism. Cells are spherical, ovoidal, or ellipsoidal, with two equal flagella at one end, and two or three contractile vacuoles at the base of the flagella. The cell wall is swollen, giving the appearance of a layer surrounding the protoplast. Cells contain a single large chloroplast filling the cell, with pyrenoids and a stigma. Asexual reproduction occurs by the formation of zoospores within the parent cell wall; sexual reproduction has not been observed. Species are distinguished from each other by their cell shape, number of contractile vacuoles and py ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vitreochlamys Gloeocystiformis
''Vitreochlamys'' is a genus of green algae in the family Chlamydomonadaceae.See the NCBIbr>webpage on Vitreochlamys Data extracted from the It is sometimes known by the name ''Sphaerellopsis'', published by Aleksandr Arkadievich Korshikov. However, that name is an illegitimate later homonym, preceded by ''Sphaerellopsis'' . It is commonly found in freshwater habitats. ''Vitreochlamys'' is a unicellular, free-living organism. Cells are spherical, ovoidal, or ellipsoidal, with two equal flagella at one end, and two or three contractile vacuoles at the base of the flagella. The cell wall is swollen, giving the appearance of a layer surrounding the protoplast. Cells contain a single large chloroplast filling the cell, with pyrenoids and a stigma. Asexual reproduction occurs by the formation of zoospores within the parent cell wall; sexual reproduction has not been observed. Species are distinguished from each other by their cell shape, number of contractile vacuoles and py ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vitreochlamys Nekrassovii
''Vitreochlamys'' is a genus of green algae in the family Chlamydomonadaceae.See the NCBIbr>webpage on Vitreochlamys Data extracted from the It is sometimes known by the name ''Sphaerellopsis'', published by Aleksandr Arkadievich Korshikov. However, that name is an illegitimate later homonym, preceded by ''Sphaerellopsis'' . It is commonly found in freshwater habitats. ''Vitreochlamys'' is a unicellular, free-living organism. Cells are spherical, ovoidal, or ellipsoidal, with two equal flagella at one end, and two or three contractile vacuoles at the base of the flagella. The cell wall is swollen, giving the appearance of a layer surrounding the protoplast. Cells contain a single large chloroplast filling the cell, with pyrenoids and a stigma. Asexual reproduction occurs by the formation of zoospores within the parent cell wall; sexual reproduction has not been observed. Species are distinguished from each other by their cell shape, number of contractile vacuoles and py ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vitreochlamys Ordinata
''Vitreochlamys'' is a genus of green algae in the family Chlamydomonadaceae.See the NCBIbr>webpage on Vitreochlamys Data extracted from the It is sometimes known by the name ''Sphaerellopsis'', published by Aleksandr Arkadievich Korshikov. However, that name is an illegitimate later homonym, preceded by ''Sphaerellopsis'' . It is commonly found in freshwater habitats. ''Vitreochlamys'' is a unicellular, free-living organism. Cells are spherical, ovoidal, or ellipsoidal, with two equal flagella at one end, and two or three contractile vacuoles at the base of the flagella. The cell wall is swollen, giving the appearance of a layer surrounding the protoplast. Cells contain a single large chloroplast filling the cell, with pyrenoids and a stigma. Asexual reproduction occurs by the formation of zoospores within the parent cell wall; sexual reproduction has not been observed. Species are distinguished from each other by their cell shape, number of contractile vacuoles and py ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vitreochlamys Pinguis
''Vitreochlamys'' is a genus of green algae in the family Chlamydomonadaceae.See the NCBIbr>webpage on Vitreochlamys Data extracted from the It is sometimes known by the name ''Sphaerellopsis'', published by Aleksandr Arkadievich Korshikov. However, that name is an illegitimate later homonym, preceded by ''Sphaerellopsis'' . It is commonly found in freshwater habitats. ''Vitreochlamys'' is a unicellular, free-living organism. Cells are spherical, ovoidal, or ellipsoidal, with two equal flagella at one end, and two or three contractile vacuoles at the base of the flagella. The cell wall is swollen, giving the appearance of a layer surrounding the protoplast. Cells contain a single large chloroplast filling the cell, with pyrenoids and a stigma. Asexual reproduction occurs by the formation of zoospores within the parent cell wall; sexual reproduction has not been observed. Species are distinguished from each other by their cell shape, number of contractile vacuoles and py ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vitreochlamys Fluviatilis
''Vitreochlamys'' is a genus of green algae in the family Chlamydomonadaceae.See the NCBIbr>webpage on Vitreochlamys Data extracted from the It is sometimes known by the name ''Sphaerellopsis'', published by Aleksandr Arkadievich Korshikov. However, that name is an illegitimate later homonym, preceded by ''Sphaerellopsis'' . It is commonly found in freshwater habitats. ''Vitreochlamys'' is a unicellular, free-living organism. Cells are spherical, ovoidal, or ellipsoidal, with two equal flagella at one end, and two or three contractile vacuoles at the base of the flagella. The cell wall is swollen, giving the appearance of a layer surrounding the protoplast. Cells contain a single large chloroplast filling the cell, with pyrenoids and a stigma. Asexual reproduction occurs by the formation of zoospores within the parent cell wall; sexual reproduction has not been observed. Species are distinguished from each other by their cell shape, number of contractile vacuoles and py ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chlamydomonadaceae
Chlamydomonadaceae is a family of algae within the order Chlamydomonadales.See the NCBIbr>webpage on Chlamydomonadaceae Data extracted from the Genera As accepted by WoRMS; * '' Agloë'' * ''Brachiomonas'' * ''Carteria'' * '' Cercidium'' * ''Chlainomonas'' * ''Chlamydomonas'' * '' Chlamydonephris'' * '' Chlorobrachis'' * '' Chloroceras'' * '' Chloromonas'' * '' Chlorotriangulum'' * '' Corbierea'' * '' Costachloris'' * '' Cylindromonas'' * '' Diplostauron'' * '' Furcilla'' * '' Gigantochloris'' * '' Gloeomonas'' * ''Heterochlamydomonas'' * '' Hirtusochloris'' * '' Hyalobrachion'' * '' Isococcus'' * '' Ixipapillifera'' * ''Lobochlamys'' * ''Lobomonas'' * '' Microglena'' * '' Oltmannsiella'' * ''Oogamochlamys'' * '' Parapolytoma'' * '' Peterfiella'' * '' Phyllariochloris'' * '' Polytoma'' * '' Pithiscus'' * '' Provasoliella'' * '' Pseudocarteria'' * '' Pseudofurcilla'' * '' Pyramichlamys'' * '' Rhysamphichloris'' * '' Sanguina'' * '' Selenoch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pyrenoid
Pyrenoids are sub-cellular micro-compartments found in chloroplasts of many algae,Giordano, M., Beardall, J., & Raven, J. A. (2005). CO2 concentrating mechanisms in algae: mechanisms, environmental modulation, and evolution. Annu. Rev. Plant Biol., 56, 99-131. and in a single group of land plants, the hornworts.Villarreal, J. C., & Renner, S. S. (2012) Hornwort pyrenoids, carbon-concentrating structures, evolved and were lost at least five times during the last 100 million years. ''Proceedings of the National Academy of Sciences'',109(46), 1873-1887. Pyrenoids are associated with the operation of a carbon-concentrating mechanism (CCM). Their main function is to act as centres of carbon dioxide (CO2) fixation, by generating and maintaining a CO2 rich environment around the photosynthetic enzyme ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO). Pyrenoids therefore seem to have a role analogous to that of carboxysomes in cyanobacteria. Algae are restricted to aqueous env ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polyphyletic
A polyphyletic group is an assemblage of organisms or other evolving elements that is of mixed evolutionary origin. The term is often applied to groups that share similar features known as homoplasies, which are explained as a result of convergent evolution. The arrangement of the members of a polyphyletic group is called a polyphyly .. ource for pronunciation./ref> It is contrasted with monophyly and paraphyly. For example, the biological characteristic of warm-bloodedness evolved separately in the ancestors of mammals and the ancestors of birds; "warm-blooded animals" is therefore a polyphyletic grouping. Other examples of polyphyletic groups are algae, C4 photosynthetic plants, and edentates. Many taxonomists aim to avoid homoplasies in grouping taxa together, with a goal to identify and eliminate groups that are found to be polyphyletic. This is often the stimulus for major revisions of the classification schemes. Researchers concerned more with ecology than with systema ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Circumscription (taxonomy)
In biological taxonomy, circumscription is the content of a taxon, that is, the delimitation of which subordinate taxa are parts of that taxon. If we determine that species X, Y, and Z belong in Genus A, and species T, U, V, and W belong in Genus B, those are our circumscriptions of those two genera. Another systematist might determine that T, U, V, W, X, Y, and Z all belong in genus A. Agreement on circumscriptions is not governed by the Codes of Zoological or Botanical Nomenclature, and must be reached by scientific consensus. A goal of biological taxonomy is to achieve a stable circumscription for every taxon. This goal conflicts, at times, with the goal of achieving a natural classification that reflects the evolutionary history of divergence of groups of organisms. Balancing these two goals is a work in progress, and the circumscriptions of many taxa that had been regarded as stable for decades are in upheaval in the light of rapid developments in molecular phylogenetics ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volvocaceae
The Volvocaceae are a family of unicellular or colonial biflagellates, including the typical genus ''Volvox''. The family was named by Ehrenberg in 1834,From p. 281: ''"VOLVOCINA Nova Familia."'' (Volvocina New Family.) ote: According to p. 145, Ehrenberg's paper was first presented in 1832, revised somewhat, and published in 1834./ref> and is known in older classifications as the Volvocidae. All species are colonial and inhabit freshwater environments. Description The simplest of the Volvocaeans are ordered assemblies of cells, each similar to the related unicellular protist ''Chlamydomonas'' and embedded in a gelatinous matrix. In the genus ''Gonium'', for example, each individual organism is a flat plate consisting of 4 to 16 separate cells, each with two flagella. Similarly, the genera ''Eudorina'' and ''Pandorina'' form hollow spheres, the former consisting of 16 cells, the latter of 32 to 64 cells. In these genera each cell can reproduce a new organism by mitosis.Scot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zoospore
A zoospore is a motile asexual spore that uses a flagellum for locomotion. Also called a swarm spore, these spores are created by some protists, bacteria, and fungi to propagate themselves. Diversity Flagella types Zoospores may possess one or more distinct types of flagella - tinsel or "decorated", and whiplash, in various combinations. *Tinsellated (straminipilous) flagella have lateral filaments known as mastigonemes perpendicular to their main axis, which allow for more surface area, and disturbance of the medium, giving them the property of a rudder, that is, used for steering. *Whiplash flagella are straight, to power the zoospore through its medium. Also, the "default" zoospore only has the propelling, whiplash flagella. Both tinsel and whiplash flagella beat in a sinusoidal wave pattern, but when both are present, the tinsel beats in the opposite direction of the whiplash, to give two axes of control of motility. Morphological types In eukaryotes, the four main types ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
