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Bryopsidales
Bryopsidales is an order of green algae, in the class Ulvophyceae. Characteristics The thallus is filamentous and much branched and may be packed into a mass. It is coenocytic, having multi-nucleate cells consisting of cytoplasm contained within a cylindrical cell wall. There are no septae and the many discoid chloroplasts, nuclei and other organelles are free to move through the organism. The whole organism may consist of a single cell and in the genus ''Caulerpa'' this may be several metres across. In the genus '' Halimeda'', whole seabed meadows may consist of an individual, single-celled organism connected by filamentous threads running through the substrate. Reproduction Propagation is normally vegetative from small fragments which grow into new individuals. Under certain conditions sexual reproduction occurs in a process called holocarpy. Almost all of the cytoplasm in the thallus is converted into biflagellate gametes, which are discharged into the sea through papillae ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Halimeda
''Halimeda'' is a genus of green macroalgae. The algal body (thallus) is composed of calcified green segments. Calcium carbonate is deposited in its tissues, making it inedible to most herbivores. However one species, '' Halimeda tuna'', was described as pleasant to eat with oil, vinegar, and salt. As in other members of the order Bryopsidales, individual organisms are made up of single multi-nucleate cells. Whole meadows may consist of a single individual alga connected by fine threads running through the substrate. ''Halimeda'' is responsible for distinctive circular deposits in various parts of the Great Barrier Reef on the north-east coast of Queensland, Australia. ''Halimeda'' beds form in the western or lee side of outer shield reefs where flow of nutrient-rich water from the open sea allows them to flourish, and are the most extensive, actively accumulating ''Halimeda'' beds in the world. The genus is one of the best studied examples of cryptic species pairs due to morph ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Udoteaceae
Udoteaceae is a family of green algae, in the order Bryopsidales. Description Udoteaceae is a family of green algae that belongs to the order Bryopsidales. Udoteaceae are most abundant in reef ecosystems as it serves an important ecological role as a primary producer, contributor to carbonate fluxes, and it serves as protection or food for other marine organisms. Udoteaceae is the most morphologically complex family belonging to the order Bryopsidales. Along with its high morphological complexity, Udoteaceae also has high species diversity. There are fourteen genera, eight extant, belonging to the family Udoteaceae, however only four are officially accepted. There are twenty-four species belonging to these genera, however because genetic information on Udoteaceae is limited, these species are classified primarily from morphological features. Udoteaceae’s structure is siphonous and composed of a giant, multinucleate tubular cell. Udoteaceae contains taxa that are either ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bryopsidales
Bryopsidales is an order of green algae, in the class Ulvophyceae. Characteristics The thallus is filamentous and much branched and may be packed into a mass. It is coenocytic, having multi-nucleate cells consisting of cytoplasm contained within a cylindrical cell wall. There are no septae and the many discoid chloroplasts, nuclei and other organelles are free to move through the organism. The whole organism may consist of a single cell and in the genus ''Caulerpa'' this may be several metres across. In the genus '' Halimeda'', whole seabed meadows may consist of an individual, single-celled organism connected by filamentous threads running through the substrate. Reproduction Propagation is normally vegetative from small fragments which grow into new individuals. Under certain conditions sexual reproduction occurs in a process called holocarpy. Almost all of the cytoplasm in the thallus is converted into biflagellate gametes, which are discharged into the sea through papillae ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caulerpa
''Caulerpa'' is a genus of seaweeds in the family Caulerpaceae (among the green algae). They are unusual because they consist of only one cell with many nuclei, making them among the biggest single cells in the world. A species in the Mediterranean can have a stolon more than long, with up to 200 fronds. This species can be invasive from time to time. Referring to the crawling habit of its thallus, the name means 'stem (that) creeps', from the Ancient Greek ' (, ‘stalk’) and ' (, ‘to creep’). Taxonomy and nomenclature First described by Jean Vincent Lamouroux in 1809, ''Caulerpa'' is the only genus under the family Caulerpaceae, from the order Bryopsidales, class Ulvophyceae, and phylum Chlorophyta. Through the use of ''tuf''A gene sequencing, it was revealed that ''Pseudochlorodesmis'' F. Børgesen was a sister clade of ''Caulerpa''. Cremen et al. proposed a new classification scheme in Bryopsidales, wherein Caulerpaceae and Halimedaceae were described as sister fami ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ulvophyceae
The Ulvophyceae or ulvophytes are a class of green algae, distinguished mainly on the basis of ultrastructural morphology, life cycle and molecular phylogenetic data.Graham LE, Graham JM, Wilcox LW (2009) ''Algae''. 2nd Edition. Benjamin Cummings (Pearson), San Francisco, CA The sea lettuce, ''Ulva'', belongs here. Other well-known members include ''Caulerpa'', ''Codium'', ''Acetabularia'', ''Cladophora'', '' Trentepohlia'' and ''Monostroma''. The Ulvophytes are diverse in their morphology and their habitat. Most are seaweeds such as those listed above. Others, such as ''Rhizoclonium'', ''Pithophora'' and some species of ''Cladophora'' live in fresh water and in some areas are considered weeds. Evolution The origin and early diversification of the Ulvophyceae likely took place in the late Neoproterozoic. Although most contemporary ulvophytes are marine macroalgae (seaweeds), ancestral ulvophytes may have been freshwater, unicellular green algae. Molecular phylogenetic eviden ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chaetosiphonaceae
Chaetosiphonaceae is a family of green algae, in the order Bryopsidales Bryopsidales is an order of green algae, in the class Ulvophyceae. Characteristics The thallus is filamentous and much branched and may be packed into a mass. It is coenocytic, having multi-nucleate cells consisting of cytoplasm contained withi .... References External links Ulvophyceae families Bryopsidales Monogeneric algae families {{green algae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coenocyte
A coenocyte () is a multinucleate cell which can result from multiple nuclear divisions without their accompanying cytokinesis, in contrast to a syncytium, which results from cellular aggregation followed by dissolution of the cell membranes inside the mass. The word syncytium in animal embryology is used to refer to the coenocytic blastoderm of invertebrates. A coenocytic colony is referred to as a coenobium (plural coenobia), and most coenobia are composed of a distinct number of cells, often as a multiple of two (4, 8, etc.). Research suggests that coenobium formation may be a defense against grazing in some species. Physiological examples Protists Diplomonads, like '' Giardia'', have two nuclei. Ciliates have cells that contain two nuclei: a macronucleus and a micronucleus. The schizont of apicomplexan parasites is a form of a coenocyte (i.e. a plasmodium in the general sense) as well as the plasmodia of microsporidian (Fungi) and myxosporidian (Metazoa) parasites. The tro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bryopsidaceae
Bryopsidaceae is a family of green algae, in the order Bryopsidales Bryopsidales is an order of green algae, in the class Ulvophyceae. Characteristics The thallus is filamentous and much branched and may be packed into a mass. It is coenocytic, having multi-nucleate cells consisting of cytoplasm contained withi .... References Ulvophyceae families Bryopsidales {{green algae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Codiaceae
Codiaceae is a family of green algae in the order Bryopsidales. Genera * † '' Abacella'' Maslov * '' Appeninocodium'' O.Dragastan * ''Arabicodium'' G.F.Elliott * '' Bevocastria'' E.J.Garwood * '' Botryella'' V.P.Shuysky * '' Boueina'' F.Toula * ''Codium'' Stackhouse * '' Garwoodia'' Alan Wood * ''Geppella'' Børgesen * ''Hedstroemia'' A.Rothpletz * ''Ivanovia ''Ivanovia'' is an extinct genus of marine green algae belonging to the order Bryopsidales and family Codiaceae. Species belonging to the genus lived from the Pennsylvanian to the Permian and have been found in the Moscow basin, North America, ...'' Khvorova * '' Johnsonicodium'' O.Dragastan * '' Neoanchicodium'' R.Endô * '' Scotlandella'' O.Dragastan * '' Succodium'' Konishi * '' Tethysicodium'' O.Dragastan Synonyms: * '' Acanthocodium'' * '' Agardhia'' A.Cabrera, 1823, nom. illeg., currently regarded as a synonym of Codium. * '' Lamarckia'' Olivi, 1792, nom. rejic., currently regarded as a synon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhipiliaceae
Rhipiliaceae is a family of green algae in the order Bryopsidales Bryopsidales is an order of green algae, in the class Ulvophyceae. Characteristics The thallus is filamentous and much branched and may be packed into a mass. It is coenocytic, having multi-nucleate cells consisting of cytoplasm contained withi .... References Ulvophyceae families {{ulvophyceae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pseudoudoteaceae
Pseudoudoteaceae is a family of green algae in the order Bryopsidales Bryopsidales is an order of green algae, in the class Ulvophyceae. Characteristics The thallus is filamentous and much branched and may be packed into a mass. It is coenocytic, having multi-nucleate cells consisting of cytoplasm contained withi .... It contains four species across two genera. References Ulvophyceae families Bryopsidales {{green algae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pseudocodiaceae
Pseudocodiaceae is a family of green algae in the order Bryopsidales Bryopsidales is an order of green algae, in the class Ulvophyceae. Characteristics The thallus is filamentous and much branched and may be packed into a mass. It is coenocytic, having multi-nucleate cells consisting of cytoplasm contained withi .... References Ulvophyceae families Bryopsidales Monogeneric algae families {{green algae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
