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Thalassionema
''Thalassionema'' is a genus of Chromista belonging to the family Thalassionemataceae. The genus was described in 1902 by Albert Grunow, Grunow ex Mereschkowsky. Species: * ''Thalassionema nitzschioides'' Grunow, 1862 References Fragilariophyceae {{diatom-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thalassionema Nitzschioides
''Thalassionema nitzschioides'' is a type of phytoplankton belonging to the Pennales, pennate diatom group. Characteristics *Length (apical axis): 10 - 110 μm *Width: 2 - 4 μm *Height: 3 - 8 μm *Marginal areolae: 10 - 12 in 10 μm ''Thalassionema nitzschioides'' are a yellow brown color. Their cells are straight and linear and they connect to form zigzagging chains. The cells are rectangular shaped, with rounded ends, and the cells are connected at the ends of each other. “Sometimes an apical spine is present and the marginal ornamentation is visible as ribs.” Global Distribution ''Thalassionema nitzschioides'' can be found all over the world except in polar regions along shallow coastal ocean waters. They occur all year round with higher concentrations in the spring and are usually found in high concentrations. Salinity and temperature conditions for optimal growth rate are 12-38 PPT and 15 °C respectively."The University of British Columbia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fragilariophyceae
Fragilariophyceae is a group of pennate diatoms lacking a raphe. Examples It includes the following genera: Fragilariales *'' Ardissonea'' *''Asterionella'' *''Asterionellopsis'' *'' Catacombas'' *'' Diatoma'' *''Fragilaria'' *'' Fragilariforma'' *'' Grammonema'' *'' Hyalosynedra'' *'' Neofragilaria'' *'' Opephora'' *'' Pseudostaurosira'' *'' Punctastriata'' *'' Staurosira'' *'' Staurosirella'' *'' Synedra'' *'' Synedropsis'' *'' Tabularia'' *'' Ulnaria'' Striatellales *'' Hyalosira'' *'' Striatella'' *'' Toxarium'' Other *''Climacosphenia'' *'' Cyclophora'' *'' Delphineis'' *'' Protoraphis'' *'' Rhabdonema'' *'' Rhaphoneis'' *'' Tabellaria'' *''Thalassionema ''Thalassionema'' is a genus of Chromista belonging to the family Thalassionemataceae. The genus was described in 1902 by Albert Grunow, Grunow ex Mereschkowsky. Species: * ''Thalassionema nitzschioides'' Grunow, 1862 References Fragi ...'' References Heterokont classes {{Diatom-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eukaryota
Eukaryotes () are organisms whose cells have a nucleus. All animals, plants, fungi, and many unicellular organisms, are Eukaryotes. They belong to the group of organisms Eukaryota or Eukarya, which is one of the three domains of life. Bacteria and Archaea (both prokaryotes) make up the other two domains. The eukaryotes are usually now regarded as having emerged in the Archaea or as a sister of the Asgard archaea. This implies that there are only two domains of life, Bacteria and Archaea, with eukaryotes incorporated among archaea. Eukaryotes represent a small minority of the number of organisms, but, due to their generally much larger size, their collective global biomass is estimated to be about equal to that of prokaryotes. Eukaryotes emerged approximately 2.3–1.8 billion years ago, during the Proterozoic eon, likely as Flagellated cell, flagellated phagotrophs. Their name comes from the Greek language, Greek wikt:εὖ, εὖ (''eu'', "well" or "good") and wikt:� ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SAR Supergroup
The SAR supergroup, also just SAR or Harosa, is a clade that includes stramenopiles (heterokonts), alveolates, and Rhizaria. The name is an acronym derived from the first letters of each of these clades; it has been alternatively spelled "RAS". The term "Harosa" (at the subkingdom level) has also been used. The SAR supergroup is a node-based taxon. Note that as a formal taxon, "Sar" has only its first letter capitalized, while the earlier abbreviation, SAR, retains all uppercase letters. Both names refer to the same group of organisms, unless further taxonomic revisions deem otherwise. Members of the SAR supergroup were once included under the separate supergroups Chromalveolata ( Chromista and Alveolata) and Rhizaria, until phylogenetic studies confirmed that stramenopiles and alveolates diverged with Rhizaria. This apparently excluded haptophytes and cryptomonads, leading Okamoto ''et al.'' (2009) to propose the clade Hacrobia to accommodate them. Phylogeny Based on a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heterokonta
Heterokonts are a group of protists (formally referred to as Heterokonta, Heterokontae or Heterokontophyta). The group is a major line of eukaryotes. Most are algae, ranging from the giant multicellular kelp to the unicellular diatoms, which are a primary component of plankton. Other notable members of the Stramenopiles include the (generally) parasitic oomycetes, including ''Phytophthora'', which caused the Great Famine of Ireland, and ''Pythium'', which causes seed rot and damping off. The name "heterokont" refers to the type of motile life cycle stage, in which the flagellated cells possess two differently arranged flagella (see zoospore). History In 1899, Alexander Luther created the term "Heterokontae" for some algae with unequal flagella, today called Xanthophyceae. Later, some authors (e.g., Copeland, 1956) included other groups in Heterokonta, expanding the name's sense. The term continues to be applied in different ways, leading to Heterokontophyta being applied ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chromista
Chromista is a biological kingdom consisting of single-celled and multicellular eukaryotic species that share similar features in their photosynthetic organelles (plastids). It includes all protists whose plastids contain chlorophyll ''c'', such as some algae, diatoms, oomycetes, and protozoans. It is probably a polyphyletic group whose members independently arose as a separate evolutionary group from the common ancestor of all eukaryotes. As it is assumed the last common ancestor already possessed chloroplasts of red algal origin, the non-photosynthetic forms evolved from ancestors able to perform photosynthesis. Their plastids are surrounded by four membranes, and are believed to have been acquired from some red algae. Chromista as a biological kingdom was created by British biologist Thomas Cavalier-Smith in 1981 to differentiate some protists from typical protozoans and plants. According to Cavalier-Smith, the kingdom originally included only algae, but his later analysis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Albert Grunow
Albert Grunow (3 November 1826, Berlin – 17 March 1914, Berndorf, Lower Austria) was a German-Austrian chemist and phycologist. He specialized in the study of diatoms. From 1851 he worked as a chemist in a metal works factory in Berndorf. In 1857-59 he participated in the Austrian "Novara Expedition", and was tasked with analysis of its algal collections. Also, he served as a collector, preparator and determiner of specimens towards the development of Gottlob Ludwig Rabenhorst's diatom exsiccatae. In 1901 he donated his collection of extant and fossil diatoms to the Natural History Museum of Vienna. He was a corresponding member of the ''Geologischen Reichsanstalt''. Selected works * ''Diatomaceen, Familie Navuculaceen'', 1860 - Diatomaceae, family Naviculaceae. * ''Ueber neue oder ungenügend gekannte Algen'', 1860 - On new or largely unknown algae. * ''Die Österreichischen Diatomaceen'', etc. 1862 - Diatomaceae of Austria. * ''Reise seiner Majestät Fregatte Novara ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
