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Chlamydomonadaceae
Chlamydomonadaceae is a family of algae within the order Chlamydomonadales. Traditionally, it has been defined as containing single-celled flagellates with a cell wall. Cells of the Chlamydomonadaceae are motile and have one, two, or four flagella. The cell body is covered in a cell wall, with the protoplast entirely or partially lined up next to the wall. Cells are uninucleate (i.e. with one nucleus). There is generally a single chloroplast, which is often cup-shaped or sometimes stellate or discoid; pyrenoids may be present or absent. Some species lack chlorophyll entirely and are saprotrophic. Contractile vacuoles may or may not be present. There is usually a single eyespot. Asexual reproduction occurs when the cell protoplast divides to form two, four, or eight daughter cells, with cell walls forming while still in the parent cell wall. Before cell division, the flagella usually disappear. Daughter cells are typically liberated when the parent cell wall gelatinizes, or th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chloromonas
''Chloromonas'' is a genus of green algae in the family Chlamydomonadaceae. It is closely related to the model green algae, ''Chlamydomonas'', and traditionally has been distinguished mainly through the absence of a pyrenoid. Species of ''Chloromonas'' occupy a variety of habitats, including soil, temporary pools of fresh water and eutrophic lakes. A number of species are adapted to living on snow, making them snow algae. The most northerly location at which this algae has been observed is Lake Bienville, Quebec, 55°N. Description ''Chloromonas'' is a unicellular organism with cells that are ranging from spherical, ovoid, cylindrical, or spindle-shaped. There are two equal flagella on the anterior end of the cell, with or without a papilla. As single large chloroplast fills the cell, and may be cup-shaped and variously lobed. Chloroplasts lack pyrenoids. An eyespot apparatus, eyespot is present in most species. There is a single nucleus typically embedded in the center of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chlainomonas
''Chlainomonas'' is a genus of algae in the family Chlamydomonadaceae.See the NCBIbr>webpage on Chlainomonas Data extracted from the They are found in freshwater habitats or on snow, where they are one of the main algae responsible for causing watermelon snow. Description ''Chlainomonas'' consists of single, ovate cells with four apical flagella attached at the tip. The protoplast is separated from the cell wall by a thick, hyaline layer; it is often filled with red pigments. There is a single chloroplast filling the cell. Pyrenoids are absent, or may be otherwise difficult to observe within the cytoplasm. There are typically two contractile vacuoles at the apex of the cell. Some species have a stigma. Life cycle ''Chlainomonas'' reproduces asexually; no sexual reproduction has been observed in this genus. The mode of asexual reproduction in ''Chlainomonas'' is highly unusual. During ''Chlainomonas'', new cells are produced when the protoplasm is squeezed through the cell en ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carteria
''Carteria'' is a genus of green algae in the family Chlamydomonadaceae. ''Carteria'' are similar in morphology to the common genus '' Chlamydomonas'' and differ by having four, rather than two, flagella at the vegetative stage. The genus name of ''Carteria'' is in honour of Henry John Carter, (1813–1895), who was a surgeon working in Bombay, India, who carried out work in geology, paleontology, and zoology. The genus was circumscribed by Karl Moritz Diesing in Sitzungsber. Kaiserl. Akad. Wiss., Wien, Math.-Nat. Cl., Abt. Vol.1 Issue 52 on page 356 in 1866. Description ''Carteria'' is a single-celled organism. The cell is surrounded by a conspicuous wall which is often differentiated into a papilla at the anterior of the cell. There are four flagella, inserted at the location of the papilla, with a cruciate arrangement. Cells contain a single chloroplast. Pyrenoids are present, with one or several. There are often two contractile vacuoles per cell. Asexual reproduction oc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chlamydomonadales
Chlamydomonadales, also known as Volvocales, are an order of flagellated or pseudociliated green algae, specifically of the Chlorophyceae.See the NCBIbr>webpage on Chlamydomonadales Data extracted from the Chlamydomonadales can form planar or spherical colonies. These vary from '' Gonium'' (four to 32 cells) up to '' Volvox'' (500 cells or more). Each cell has two flagella, and is similar in appearance to '' Chlamydomonas'', with the flagella throughout the colony moving in coordination. Both asexual and sexual reproduction occur. In the former, cells divide until they form new colonies, which are then released. In the smaller forms, typically all cells are involved, but larger forms have anterior vegetative and posterior reproductive cells. Sexual reproduction varies from isogamy (both genders produce flagellated gametes of equal size) to oogamy (one gender produces a much larger, nonmotile gamete). The classification of the Chlamydomonadales varies. Very often they are ta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chlamydomonas
''Chlamydomonas'' ( ) is a genus of green algae consisting of about 150 species of unicellular organism, unicellular flagellates, found in stagnant water and on damp soil, in freshwater, seawater, and even in snow as "snow algae". ''Chlamydomonas'' is used as a model organism for molecular biology, especially studies of flagellum, flagellar motility and chloroplast dynamics, biogenesis, and genetics. One of the many striking features of ''Chlamydomonas'' is that it contains ion channels (channelrhodopsins) that are directly activated by light. Some FLU (plant gene), regulatory systems of ''Chlamydomonas'' are more complex than their Homology (biology), homologs in Gymnosperms, with evolutionarily related Regulation of gene expression, regulatory proteins being larger and containing additional Protein domain, domains. Molecular phylogeny studies indicated that the traditional genus ''Chlamydomonas'' as defined using morphological data, was polyphyletic within Volvocales. Many s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brachiomonas
''Brachiomonas'' is a genus of thalloid biflagellate green algae. These algae generally are found in marine or brackish waters, but can tolerate wide range of salinities. They may occur in freshwater pools near the sea and, occasionally, in polluted inland freshwater habitats.http://www.eol.org/pages/90532 Encyclopedia of Life. ''Brachiomonas''. Description ''Brachiomonas'' is a single-celled, free-swimming organism. The cells have four or five large, cone-shaped projections on the equatorial region that are pointed towards the back of the cell, as well as one large cone-shaped projection on the end of the cell. In some cases, the horns may be reduced to small bumps. The cell has two flagella which are about as long or longer than the cell body itself. There is a single chloroplast which fills most of the cell, with a single pyrenoid. Cells sometimes have an eyespot, but lack contractile vacuoles. One nucleus is present in the center of the cell. Asexual reproduction occurs by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Family (biology)
Family (, : ) is one of the eight major hierarchical taxonomic ranks in Linnaean taxonomy. It is classified between order and genus. A family may be divided into subfamilies, which are intermediate ranks between the ranks of family and genus. The official family names are Latin in origin; however, popular names are often used: for example, walnut trees and hickory trees belong to the family Juglandaceae, but that family is commonly referred to as the "walnut family". The delineation of what constitutes a family—or whether a described family should be acknowledged—is established and decided upon by active taxonomists. There are not strict regulations for outlining or acknowledging a family, yet in the realm of plants, these classifications often rely on both the vegetative and reproductive characteristics of plant species. Taxonomists frequently hold varying perspectives on these descriptions, leading to a lack of widespread consensus within the scientific community ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
