are diatoms Rhizarian?
Diatoms are a major group of algae, and are among the most common types of phytoplankton. Diatoms are unicellular, although they can form colonies in the shape of filaments or ribbons (e.g. Fragilaria), fans (e.g. Meridion), zigzags (e.g. Tabellaria), or stars (e.g. Asterionella). unique feature of diatom cells is that they are enclosed within a cell wall made of silica (hydrated silicon dioxide) called a frustule. Diatoms are producers within the food chain. A unique feature of diatom cells is that they are enclosed within a cell wall made of silica (hydrated silicon dioxide) called a frustule.These frustules show a wide diversity in form, but are usually almost bilaterally symmetrical, hence the group name. unique feature of diatom cells is that they are enclosed within a cell wall made of silica (hydrated silicon dioxide) called a frustule. Diatoms are algae with distinctive, transparent cell walls made of silicon dioxide hydrated with a small amount of water (Si02 + H20). Silica is the main component of glass and hydrated silica is very like the mineral opal, making these algae, often called algae in glass houses more like algae in opal houses.iatoms have been placed in the division Bacilliariophyta, which is distinguished by the presence of an inorganic cell wall composed of hydrated silica. There are an estimated 20,000 to 2 million species of diatom on Earth. The Rhizaria are a species-rich supergroup of mostly unicellular eukaryotes. A multicellular form has recently been described.This supergroup was proposed by Cavalier-Smith in 2002. They vary considerably in form, but for the most part they are amoeboids with filose, reticulose, or microtubule-supported pseudopods.Many produce shells or skeletons, which may be quite complex in structure, and these make up the vast majority of protozoan fossils. Nearly all have mitochondria with tubular cristae.hey vary considerably in form, but for the most part they are amoeboids with filose, reticulose, or microtubule-supported pseudopods. Many produce shells or skeletons, which may be quite complex in structure, and these make up the vast majority of protozoan fossils. Nearly all have mitochondria with tubular cristae. Nearly all diatoms are microscopic-cells range in size from about 2 microns to about 500 microns (0.5 mm), or about the width of a human hair (note that one micron is equal to 10 -6 meter).iatoms have been placed in the division Bacilliariophyta, which is distinguished by the presence of an inorganic cell wall composed of hydrated silica. There are an estimated 20,000 to 2 million species of diatom on Earth. The cell wall is called a frustule and consists of two halves called valves. Since silica is impervious, diatoms have evolved elaborate patterns of perforations in their valves to allow nutrient and waste exchange with the environment.iatoms have been placed in the division Bacilliariophyta, which is distinguished by the presence of an inorganic cell wall composed of hydrated silica. There are an estimated 20,000 to 2 million species of diatom on Earth. Furthermore, because the silica cell walls do not decompose, diatoms in marine and lake sediments can be used to interpret conditions in the past. Paleoecology is a field that utilizes both living and subfossil diatom valves that are preserved in marine and freshwater sediments.iatoms have been placed in the division Bacilliariophyta, which is distinguished by the presence of an inorganic cell wall composed of hydrated silica. There are an estimated 20,000 to 2 million species of diatom on Earth. The main patterns to emerge from this are that, while there are many nuclear genomes available, they are strongly biased to a few lineages, mostly animals, fungi, plants, and parasites. On the other end of the spectrum, Rhizaria (with two genomes) is the worst sampled of any supergroup.ther more enigmatic parasitic groups are also known, such as the phagomyxids, which infect diatoms and filamentous brown algae, and the copepod parasite Paradinium .Recently, another parasite was found to belong to Rhizaria, and in some ways its story represents the history of the group as a whole. Diatoms have been placed in the division Bacilliariophyta, which is distinguished by the presence of an inorganic cell wall composed of hydrated silica. There are an estimated 20,000 to 2 million species of diatom on Earth.iatoms have been placed in the division Bacilliariophyta, which is distinguished by the presence of an inorganic cell wall composed of hydrated silica. There are an estimated 20,000 to 2 million species of diatom on Earth. There are at least 100,000 species of diatoms, which makes them the most abundant photosynthetic group after the angiosperms. Diatoms, therefore occupy a central position in the control of marine resources, and for prediction of climatic change.inally, diatoms are the principal cause of “biofouling”, because of their capacity to adhere to surfaces and to produce extracellular polymeric mucilaginous substances (EPS). The total direct costs of “antifouling” treatments in the world is estimated at 3 billion dollars.
No