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Characium Limneticum
''Characium'' is a genus of green algae in the family Characiaceae. It is very commonly found in freshwater habitats, where it is attached to phytoplankton or zooplankton. Description ''Characium'' consists of single or rarely clustered cells. They are attached to a plant or animal substrate (thus epiphytic or epizoic), via a stalk or a circular pad. The cells have diverse shapes, ranging from fusiform to club-shaped or spherical, and are variously straight, hooked, or S-shaped. Cells usually contain a single parietal chloroplast filling the cell, with a central pyrenoid. In some species, the chloroplasts fragment into multiple plastids, each with one pyrenoid. Mature cells have one nucleus (are uninucleate). ''Characium'' reproduces asexually by zoospores. Zoospores have two flagella. Identification The genus ''Characium'' is similar to '' Characiopsis'', a type of algae in the class Eustigmatophyceae. The two genera are very similar and have been confused in the past; howeve ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Genus
Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In binomial nomenclature, the genus name forms the first part of the binomial species name for each species within the genus. :E.g. ''Panthera leo'' (lion) and ''Panthera onca'' (jaguar) are two species within the genus ''Panthera''. ''Panthera'' is a genus within the family Felidae. The composition of a genus is determined by taxonomy (biology), taxonomists. The standards for genus classification are not strictly codified, so different authorities often produce different classifications for genera. There are some general practices used, however, including the idea that a newly defined genus should fulfill these three criteria to be descriptively useful: # monophyly – all descendants of an ancestral taxon are grouped together (i.e. Phylogeneti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deuterocharacium
''Deuterocharacium'' is a genus of green algae in the family Characiaceae. It is found in freshwater habitats, attached to algae or detritus. It is rare and has only been recorded from Europe. Description ''Deuterocharacium'' consists of solitary cells that are attached to a substrate via a short mucilaginous pad or a pedicel. Cells are 30-50 μm long and 6-12 μm wide, cylindrical to ovoid, with a rounded or pointed tip. Cells have many small, discoid chloroplasts lining the inside of the cell membrane, which lack pyrenoids. ''Deuterocharacium'' has been described as uninucleate (i.e. containing a single nucleus); other sources state the adult cells are multinucleate, but this may be before the zoospores are formed. No eyespot is present. ''Deuterocharacium'' reproduces asexually; sexual reproduction has not been observed in this genus. It obligately produces zoospores which have two flagella and a single chloroplast containing a pyrenoid. Zoospores are produced in groups of 3 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Characium Guttula
''Characium'' is a genus of green algae in the family Characiaceae. It is very commonly found in freshwater habitats, where it is attached to phytoplankton or zooplankton. Description ''Characium'' consists of single or rarely clustered cells. They are attached to a plant or animal substrate (thus epiphytic or epizoic), via a stalk or a circular pad. The cells have diverse shapes, ranging from fusiform to club-shaped or spherical, and are variously straight, hooked, or S-shaped. Cells usually contain a single parietal chloroplast filling the cell, with a central pyrenoid. In some species, the chloroplasts fragment into multiple plastids, each with one pyrenoid. Mature cells have one nucleus (are uninucleate). ''Characium'' reproduces asexually by zoospores. Zoospores have two flagella. Identification The genus ''Characium'' is similar to '' Characiopsis'', a type of algae in the class Eustigmatophyceae. The two genera are very similar and have been confused in the past; howeve ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
