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Acinetactis
''Acinetactis'' is a possible genus of protist first described in 1886 by A.C. Stokes, who also described the type species ''A. mirabilis''. In 1928, Valkanov reported the discovery of a second species, ''A. arnaudovii''. The most recently recorded specimen of ''A. mirabilis'' was reported in 1940, no ''Acinetactis'' specimens have been reported since. The validity and classification of this genus is contested. In 1914, Adolf Pascher cast doubt on ''Acinetactis'', suggesting that it was a junior synonym of ''Dimorpha mutans''. Cavalier-Smith classified ''Acinetactis'' as a heliomonad in 1993. Bass et al. suggested in 2009 that the genus was a cercozoan in the class Granofilosea Granofilosea is a class of cercozoans in the subphylum Filosa. Three groups that were traditionally considered heliozoans belong here: the Heliomonadida, Desmothoracida and Gymnosphaerida, which were recently grouped into the new class of Gran .... References {{Taxonbar, from=Q341450 Cercozoa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Protist
A protist () is any eukaryotic organism (that is, an organism whose cells contain a cell nucleus) that is not an animal, plant, or fungus. While it is likely that protists share a common ancestor (the last eukaryotic common ancestor), the exclusion of other eukaryotes means that protists do not form a natural group, or clade. Therefore, some protists may be more closely related to animals, plants, or fungi than they are to other protists. However, like the groups ''algae'', ''invertebrates'', and '' protozoans'', the biological category ''protist'' is used for convenience. Others classify any unicellular eukaryotic microorganism as a protist. The study of protists is termed protistology. History The classification of a third kingdom separate from animals and plants was first proposed by John Hogg in 1860 as the kingdom Protoctista; in 1866 Ernst Haeckel also proposed a third kingdom Protista as "the kingdom of primitive forms". Originally these also included prokaryotes, b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Adolf Pascher
Adolf Alois Pascher (31 May 1881 – 7 May 1945) was a Bohemian botanist and phycologist, notable for his descriptions of several new genera of algae, protists, and vascular plants. Biography Born in Stožec, Pascher was the son of a teacher, attended the Gymnasium (school), Gymnasium in Český Krumlov, Krummau and studied natural science at the German University in Prague, from which he received a doctorate in 1905, and graduated in 1909. In 1908, in partnership with Viktor Langhans, he co-founded a Hydrobiological Laboratory in Doksy, Hirschberg. In 1912 he became an associate professor of Herbalism and Cryptogam, Cryptogamic Botany, later being promoted to Full Professor in 1927. In 1933, he became Director of the Botanical Institutes and Botanical Gardens at the German University in Prague. He served as the editor for ''Beihefte zum Botanischen Centralblatt'' for the last twenty years of his life. A German nationalist, he joined the Sudeten German Party in 1938, and followi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Junior Synonym
The Botanical and Zoological Codes of nomenclature treat the concept of synonymy differently. * In botanical nomenclature, a synonym is a scientific name that applies to a taxon that (now) goes by a different scientific name. For example, Linnaeus was the first to give a scientific name (under the currently used system of scientific nomenclature) to the Norway spruce, which he called ''Pinus abies''. This name is no longer in use, so it is now a synonym of the current scientific name, ''Picea abies''. * In zoology, moving a species from one genus to another results in a different binomen, but the name is considered an alternative combination rather than a synonym. The concept of synonymy in zoology is reserved for two names at the same rank that refers to a taxon at that rank - for example, the name ''Papilio prorsa'' Linnaeus, 1758 is a junior synonym of ''Papilio levana'' Linnaeus, 1758, being names for different seasonal forms of the species now referred to as ''Araschnia lev ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cercomonas
Cercomonads are small flagellates, widespread in aqueous habitats and common in soils. Characteristics The cells are generally around 10 μm in length, without any shell or covering. They produce filose pseudopods to capture bacteria, but do not use them for locomotion, which usually takes place by gliding along surfaces. Most members have two flagella, one directed forward and one trailing under the cell, inserted at right angles near its anterior. The nucleus is connected to the flagellar bases and accompanied by a characteristic paranuclear body. Classification Genetic studies place the cercomonads among the Cercozoa, a diverse group of amoeboid and flagellate protozoans. They are divided into two families. * The Heteromitidae tend to be relatively rigid, and produce only temporary pseudopods. * The Cercomonadidae are more plastic, and when food supplies are plentiful may become amoeboid and even multinucleate. The classification of genera and species continues to u ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heliomonad
The Heliomonadida (formerly Dimorphida) are a small group of heliozoan amoeboids that are unusual in possessing flagella throughout their life cycle. Classification Genetic studies place them among the Cercozoa, a group including various other flagellates that form filose pseudopodia. This order has recently been placed into the new class of naked filose cercozoans called Granofilosea. There are two genera in this order: * ''Heliomorpha'', a tiny organism found in freshwater * the larger '' Tetradimorpha'', which is distinguished by having four rather than two flagella. Morphology Bundles of microtubules, typically in square array, arise from a body near the flagellar bases and support the numerous axopods that project from the cell surface. Dimorphids have a single nucleus, and mitochondria A mitochondrion (; ) is an organelle found in the Cell (biology), cells of most Eukaryotes, such as animals, plants and Fungus, fungi. Mitochondria have a double lipid bilayer, memb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cercozoan
Cercozoa is a phylum of diverse single-celled eukaryotes. They lack shared morphological characteristics at the microscopic level, and are instead defined by molecular phylogenies of rRNA and actin or polyubiquitin. They were the first major eukaryotic group to be recognized mainly through molecular phylogenies. They are the natural predators of many species of microbacteria and Archea. They are closely related to the phylum Retaria, comprising amoeboids that usually have complex shells, and together form a supergroup called Rhizaria. Characteristics The group includes most amoeboids and flagellates that feed by means of filose pseudopods. These may be restricted to part of the cell surface, but there is never a true cytostome or mouth as found in many other protozoa. They show a variety of forms and have proven difficult to define in terms of structural characteristics, although their unity is strongly supported by phylogenetic studies. Diversity Some cercozoans are grouped by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Granofilosea
Granofilosea is a class of cercozoans in the subphylum Filosa. Three groups that were traditionally considered heliozoans belong here: the Heliomonadida, Desmothoracida and Gymnosphaerida, which were recently grouped into the new class of Granofilosea. Taxonomy * Class Granofilosea Cavalier-Smith & Bass 2009 ** Family ? Microgromiidae De Saedeleer 1934 *** Genus '' Apogromia'' de Saedeleer 1934 *** Genus '' Belaria'' de Saedeleer 1934 *** Genus '' Heterogromia'' de Saedeleer 1934 *** Genus '' Microgromia'' Hertwig & Lesser 1874 *** Genus '' Paralieberkuehnia'' de Saedeleer 1934 ** Order ? Axomonadida xonucleoaxoplastiales*** Family Tetradimorphidae Febvre-Chevalier & Febvre 1984 **** Genus '' Tetradimorpha'' Hsiung 1927 ** Order Desmothoracida Honigberg et al. 1964 ryptaxohelida; Desmothoraca Hertwig & Lesser 1874; Clathrulinida Starobogatov 1980*** Family Clathrulinidae Claus 1874 **** Genus '' Actinosphaeridium'' Zacharias 1893 **** Genus '' Cienkowskya'' Schaudinn 1896 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
