|
Chlorosarcinales
Chlamydomonadales, also known as Volvocales, are an order (biology), order of flagellated or pseudociliated green algae, specifically of the Chlorophyceae.See the National Center for Biotechnology Information, NCBI]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 reproduction, 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). ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chlorosarcinaceae
Chlorosarcinaceae is a family (biology), family of Chlorophyta, chlorophyte green algae, in the order Chlamydomonadales. Members of this genus are found in soils. Members of the family Chlorosarcinaceae usually occur as irregular packet-shaped colonies, rarely singly. Cells are spherical to irregular, particularly flattened at the walls when in contact with neighboring cells. The chloroplast is varied in morphology; it may be parietal and cup- or mantle-shaped, or centrally located and irregular or reticulate. Pyrenoids are present in most genera. Reproduction occurs via cell division, and via the formation of zoospores. As currently defined, the family is a polyphyletic and thus artificial assemblage of different genera. Phylogenetic analyses have placed the genera as sister to various taxa within the Chlamydomonadales. The type species of the type genus, ''Chlorosarcina elegans'', is not available in culture. Genera , AlgaeBase accepted the following genera: *''Borodinella'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Order (biology)
Order () is one of the eight major hierarchical taxonomic ranks in Linnaean taxonomy. It is classified between family and class. In biological classification, the order is a taxonomic rank used in the classification of organisms and recognized by the nomenclature codes. An immediately higher rank, superorder, is sometimes added directly above order, with suborder directly beneath order. An order can also be defined as a group of related families. What does and does not belong to each order is determined by a taxonomist, as is whether a particular order should be recognized at all. Often there is no exact agreement, with different taxonomists each taking a different position. There are no hard rules that a taxonomist needs to follow in describing or recognizing an order. Some taxa are accepted almost universally, while others are recognized only rarely. The name of an order is usually written with a capital letter. For some groups of organisms, their orders may follow consist ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Goniaceae
Goniaceae is a family of algae in the order Chlamydomonadales, that includes the genera '' Astrephomene'' and '' Gonium''. Members of the Goniaceae are distinguished from those of the Volvocaceae by having each cell surrounded by a tripartite boundary of the extracellular matrix, as opposed to the entire colony being surrounded by the tripartite boundary in Volvocaceae. Goniaceae is the sister group In phylogenetics, a sister group or sister taxon, also called an adelphotaxon, comprises the closest relative(s) of another given unit in an evolutionary tree. Definition The expression is most easily illustrated by a cladogram: Taxon A and ... to Volvocaceae. References Chlorophyceae families Chlamydomonadales {{Chlorophyceae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dunaliellaceae
Dunaliellaceae is a family of algae in the order Chlamydomonadales. It is widespread in freshwater and saline environments worldwide, less so in marine waters. Members of the family Dunaliellaceae are single-celled, flagellate algae. They are of various shapes (most commonly spheroidal, less commonly flattened), without sharp edges, ribs or processes. The periplast lacks cell walls or other coverings, such as scales, and are thus flexible to varying degrees. Two or four flagella are present. The chloroplast is variable in shape, and a both a pyrenoid and stigma may be present or absent; some taxa are colorless and lack chloroplasts (or at least they are reduced to leucoplasts). Reproduction occurs by cell division, which begins at the apex of the cell. Dunaliellaceae, as currently circumscribed, is polyphyletic. A systematic revision is underway that includes molecular data to better reflect phylogenetic relationships. Currently, both the traditional name Dunaliellaceae is in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chlorococcaceae
Chlorococcaceae is a family of green algae, in the order Chlamydomonadales. They are mostly soil-dwelling algae. Many members of this group produce lipids and secondary carotenoids. The Chlorococcaceae consists mostly of coccoid (single, nonmotile) cells with one parietal or central chloroplast and one or multiple nuclei. The chloroplast contains a single pyrenoid surrounded by a starch envelope. The cell envelope may thicken with age and develop into a mucilaginous stalk in some species. Reproduction consists of zoospores with a cell wall; after they stop swimming, the zoospores retain their shape. The family Chlorococcaceae is currently under taxonomic revision. As currently circumscribed, the type genus '' Chlorococcum'' is polyphyletic. The type species, '' Chlorococcum infusionum'', is a member of the clade ''Moewusinia''. List of genera * '' Apodochloris'' * '' Athroocystis'' * '' Axilococcus'' * '' Borodinellopsis'' * '' Chlorococcum'' * '' Chlorohippotes'' * '' Closte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chlorochytriaceae
Chlorochytriaceae is a family of algae within the order Chlamydomonadales. Alternatively, it shows some morphological similarity to Characiosiphonaceae and closely related to it. It contains a number of parasitic taxa endophytic within vascular plants, mosses, or other algae. The family Chlorochytriaceae consists of microscopic organisms which are unicellular or multicellular, with relatively large cells (up to 400 µm long); the cells may have an secondarily thickened cell wall or rhizoidal extensions. Chloroplasts are usually parietally located, and may be divided into complex lobes and/or contain pyrenoids. Cells contain one or more nuclei. Reproduction occurs via zoospores with two flagella A flagellum (; : flagella) (Latin for 'whip' or 'scourge') is a hair-like appendage that protrudes from certain plant and animal sperm cells, from fungal spores ( zoospores), and from a wide range of microorganisms to provide motility. Many pr ...; sexual reproduction via gametes m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chlorangiellaceae
Chlorangiellaceae is a green algae family in the order Chlamydomonadales. The Chlorangiellaceae consists of solitary or colonial organisms, attached to a substrate. Cells may be embedded in gelatinous cell wall sheaths, or with no gelatinous mass and instead attached to the substrate via stalks, pads, or threads. Reproduction occurs via zoospores or gametes. Organisms in Chlorangiellaceae are typically epibiontic on plankton Plankton are the diverse collection of organisms that drift in Hydrosphere, water (or atmosphere, air) but are unable to actively propel themselves against ocean current, currents (or wind). The individual organisms constituting plankton are ca ..., rarely tychoplanktonic. References External links * * * Chlorophyceae families Chlamydomonadales {{Chlorophyceae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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] |
Characiosiphonaceae
The Characiosiphonaceae are a family of algae in the order Chlamydomonadales. Two genera are included in this family, '' Characiosiphon'' and '' Lobocharacium'', each containing a single species. The genus '' Characiochloris'' may eventually be placed in this family pending future revisions, as it is phylogenetically closely related to the twose genera. Algae in the family Characiosiphonaceae are coenocytic, consisting of thalli attached to a substrate. In each coenocyte, there are many separate protoplasms lining a membrane, all surrounding a central sap-filled vacuole. In each protoplasm is a nucleus and a chloroplast surrounding it. Reproduction occurs by fusiform (spindle-shaped) zoospore A zoospore is a motile asexual spore that uses a flagellum for locomotion in aqueous or moist environments. Also called a swarm spore, these spores are created by some protists, bacteria, and fungi to propagate themselves. Certain zoospores are ...s and spherical gametes. References ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Characiochloridaceae
Characiochloridaceae is a family of green algae in the order Chlamydomonadales. Characiochloridaceae consists of solitary or rarely clustered cells, attached to a substrate via a stalk or other adhesive organ. Cells are heteropolar, ranging from egg-shaped to spindle- or pear-shaped, but also sometimes spherical. The adhesive part of the cell may be colored brown from iron compounds. The cell contains a single parietal chloroplast, which may be cup-shaped and variously lobed and dissected. Chloroplasts have at least one pyrenoid surrounded by a layer of starch. Vegetative cells are uninucleate, i.e. with one nucleus. Asexual reproduction occurs when the protoplast successively divides into 2-64 zoospores, each with two flagella. Less often, aplanospores or autospores are formed. Sexual reproduction has been observed, but is rare. The taxonomy of Characiochloridaceae is in need of revision, as phylogenetic studies using rDNA have shown that it is not monophyletic. The type genus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
