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Tetraedron Rectangulare
''Tetraedron'' is a genus of green algae in the family Hydrodictyaceae. It may also be spelled as ''Tetraëdron''. Description ''Tetraedron'' consists of single, free-floating cells, making them phytoplankton. They are flattened, triangular, quadrangular, or irregularly polygonal in shape; old cells are nearly spherical. The cell wall is finely granulated when viewed with a light microscope. Cells contain a single cell nucleus, nucleus and a single chloroplast which fills the cell; the chloroplast has a single pyrenoid with a starch sheath. ''Tetraedron'' reproduces asexually by autospores; two, four, or eight autospores are formed in the mother cell and are released by rupture of the parent cell wall. Zoospores and sexual reproduction are unknown. Taxonomy ''Tetraedron'' is currently placed in the family Hydrodictyaceae. Many species have been placed in this genera, on the basis of their polygonal shapes; however, many have been transferred to other genera. Among the green alg ... [...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] |
Tetraedron Cruciatum
''Tetraedron'' is a genus of green algae in the family Hydrodictyaceae. It may also be spelled as ''Tetraëdron''. Description ''Tetraedron'' consists of single, free-floating cells, making them phytoplankton. They are flattened, triangular, quadrangular, or irregularly polygonal in shape; old cells are nearly spherical. The cell wall is finely granulated when viewed with a light microscope. Cells contain a single nucleus and a single chloroplast which fills the cell; the chloroplast has a single pyrenoid with a starch sheath. ''Tetraedron'' reproduces asexually by autospores; two, four, or eight autospores are formed in the mother cell and are released by rupture of the parent cell wall. Zoospores and sexual reproduction are unknown. Taxonomy ''Tetraedron'' is currently placed in the family Hydrodictyaceae. Many species have been placed in this genera, on the basis of their polygonal shapes; however, many have been transferred to other genera. Among the green algae, the genus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
