|
Arcellinida
Arcellinid testate amoebae or Arcellinida,http://www.microscopy-uk.org.uk/mag/artjun03/gsamoebae.html Testate amoebae, peat bogs and past climates. accessed 16 march 2007 Arcellacean or lobose testate amoebae are single-celled protists partially enclosed in a simple test (shell). Arcellinid testate amoebae are commonly found in soils, leaf litter, peat bogs and near/in fresh water. They use their pseudopodia, a temporary cell extension, for moving and taking in food. Like most amoebae, they are generally believed to reproduce asexually via binary fission. However a recent review suggests that sexual recombination may be the rule rather than the exception in amoeboid protists in general, including the Arcellinid testate amoebae. Test or shell Simple tests are made by secretion (autogenous tests), agglutination of foreign material (xenogenous tests), or sometimes a combination of both. Past environmental changes can be determined by analysing the composition of fossil tests, includ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phryganellina
Arcellinid testate amoebae or Arcellinida,http://www.microscopy-uk.org.uk/mag/artjun03/gsamoebae.html Testate amoebae, peat bogs and past climates. accessed 16 march 2007 Arcellacean or lobose testate amoebae are single-celled protists partially enclosed in a simple test (shell). Arcellinid testate amoebae are commonly found in soils, leaf litter, peat bogs and near/in fresh water. They use their pseudopodia, a temporary cell extension, for moving and taking in food. Like most amoebae, they are generally believed to reproduce asexually via binary fission. However a recent review suggests that sexual recombination may be the rule rather than the exception in amoeboid protists in general, including the Arcellinid testate amoebae. Test or shell Simple tests are made by secretion (autogenous tests), agglutination of foreign material (xenogenous tests), or sometimes a combination of both. Past environmental changes can be determined by analysing the composition of fossil tests, includ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phryganella
Arcellinid testate amoebae or Arcellinida,http://www.microscopy-uk.org.uk/mag/artjun03/gsamoebae.html Testate amoebae, peat bogs and past climates. accessed 16 march 2007 Arcellacean or lobose testate amoebae are single-celled protists partially enclosed in a simple test (shell). Arcellinid testate amoebae are commonly found in soils, leaf litter, peat bogs and near/in fresh water. They use their pseudopodia, a temporary cell extension, for moving and taking in food. Like most amoebae, they are generally believed to reproduce asexually via binary fission. However a recent review suggests that sexual recombination may be the rule rather than the exception in amoeboid protists in general, including the Arcellinid testate amoebae. Test or shell Simple tests are made by secretion (autogenous tests), agglutination of foreign material (xenogenous tests), or sometimes a combination of both. Past environmental changes can be determined by analysing the composition of fossil tests, includ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phryganellidae
Arcellinid testate amoebae or Arcellinida,http://www.microscopy-uk.org.uk/mag/artjun03/gsamoebae.html Testate amoebae, peat bogs and past climates. accessed 16 march 2007 Arcellacean or lobose testate amoebae are single-celled protists partially enclosed in a simple test (shell). Arcellinid testate amoebae are commonly found in soils, leaf litter, peat bogs and near/in fresh water. They use their pseudopodia, a temporary cell extension, for moving and taking in food. Like most amoebae, they are generally believed to reproduce asexually via binary fission. However a recent review suggests that sexual recombination may be the rule rather than the exception in amoeboid protists in general, including the Arcellinid testate amoebae. Test or shell Simple tests are made by secretion (autogenous tests), agglutination of foreign material (xenogenous tests), or sometimes a combination of both. Past environmental changes can be determined by analysing the composition of fossil tests, i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hyalospheniformes
Hyalospheniidae is a group of testate amoebae and the sole family of the infraorder Hyalospheniformes. Hyalospheniid testate amoebae are considered important bioindicators, which is why they are frequently used for environmental monitoring and their fossils are studied to investigate the paleoecology. Phylogeny The following cladogram illustrates the evolutionary relationships between all hyalospheniid genera found through phylogenetic analysis, with the exception of '' Porosia'', a genus excluded from the analysis that appears to be closely related to '' Certesella'' and is therefore placed next to it in the cladogram. Classificaton The current taxonomy of the family recognizes 14 genera: * Infraorder Hyalospheniformes Lahr et al. 2019 ** Family Hyalospheniidae Schulze 1877 emend. Kosakyan & Lara 2014 *** ''Alabasta'' Duckert et al., 2018 *** '' Alocodera'' Jung, 1942 *** ''Apodera'' Loeblich & Tappan, 1961 *** '' Certesella'' Loeblich & Tappan, 1961 *** '' Cornutheca'' Kosakyan e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cryptodifflugiidae
Cryptodifflugiidae is a family of arcellinid testate amoebae. Description Members of this family are conopodous (with conical pseudopods) amoebae with the body in a clear, usually firm, vase-shaped test, and conical pseudopods for locomotion that extend separately from the opening of the test. Classification The classification of the family, as of 2019: * Infraorder Phryganellina Bovee 1985 ** Family Cryptodifflugiidae Penard 1890 ***''Cryptodifflugia'' Cash 1904 – 23 species *** '' Meisterfeldia'' Bobrov 2016 – 6 species *** '' Wailesella'' Deflandre 1928 – 1 species The 2022 classification places '' Meisterfeldia'' and '' Wailesella'' as Arcellinida ''incertae sedis'', leaving ''Cryptodifflugia ''Cryptodifflugia'' is a genus of arcellinid testate amoebae. It contains all the species previously grouped as the genus ''Difflugiella'', which is now a synonym of ''Cryptodifflugia''. Description ''Cryptodifflugia'' species are characteriz ...'' as the sole member of th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Testate Amoebae
Testate amoebae (formerly thecamoebians, Testacea or Thecamoeba) are a polyphyletic group of unicellular amoeboid protists, which differ from naked amoebae in the presence of a test that partially encloses the cell, with an aperture from which the pseudopodia emerge, that provides the amoeba with shelter from predators and environmental conditions. The test of some species is produced entirely by the amoeba and may be organic, siliceous or calcareous depending on the species (autogenic tests), whereas in other cases the test is made up of particles of sediment collected by the amoeba which are then agglutinated together by secretions from within the cell (xenogenic tests). A few taxa (Hyalosphenidae) can build either type, depending on the circumstances and availability of foreign material. The assemblage referred to as "testate amoebae" is actually composed of several, unrelated groups of organisms. However, some features they all share that have been used to group them together ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pseudocucurbitella
''Pseudocucurbitella'' is a genus of freshwater testate amoebae of the order Arcellinida. Its shell is agglutinated, ovoid, with a round crossection and a circular aperture surrounded by 3 to 5 separate lobes forming a short collar. Originally it was described as a subgenus of ''Difflugia'' in 1960, but was elevated to genus level in 1972. The taxonomic position of ''Pseudocucurbitella'' among Arcellinida is uncertain and the genus has been abandoned by recent classifications, but it was initially assigned to the family Difflugiidae Arcellinid testate amoebae or Arcellinida,http://www.microscopy-uk.org.uk/mag/artjun03/gsamoebae.html Testate amoebae, peat bogs and past climates. accessed 16 march 2007 Arcellacean or lobose testate amoebae are single-celled protists partially .... References Tubulinea Amoebozoa genera {{Amoebozoa-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prantlitina
''Prantlitina'' is a poorly studied genus of testate amoebae discovered in 1957 in Namurian freshwater sediments from the Ostrava-Karviná coal district, in former Czechoslovakia. It was placed in the order Thecamoebina in the defunct class Sarcodina. Later, in 1993, it was recognized as the earliest fossil member of the family Difflugiidae, order Arcellinida, but after that year it does not appear in any classification of Arcellinida or any other group. Etymology The name ''Prantlitina'' was chosen in honor of the Czechoslovak palaeontologist Paleontology (), also spelled palaeontology or palæontology, is the scientific study of life that existed prior to, and sometimes including, the start of the Holocene epoch (roughly 11,700 years before present). It includes the study of fossi ... Dr. Ferdinand Prantl. Taxonomy According to the original description, ''Prantlitina'' contains two subgenera and 6 species, of which only 4 are described and named; the remaining two were l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geococcus (eukaryote)
{{Genus disambiguation ...
Geococcus may refer to: * ''Geococcus'' (bug), a genus of bugs in the family Pseudococcidae * ''Geococcus'' (plant), a genus of plants in the family Brassicaceae * ''Geococcus'' (eukaryote), a genus of eukaryote in the order Arcellinida Arcellinid testate amoebae or Arcellinida,http://www.microscopy-uk.org.uk/mag/artjun03/gsamoebae.html Testate amoebae, peat bogs and past climates. accessed 16 march 2007 Arcellacean or lobose testate amoebae are single-celled protists partially ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Proterozoic
The Proterozoic () is a geological eon spanning the time interval from 2500 to 538.8million years ago. It is the most recent part of the Precambrian "supereon". It is also the longest eon of the Earth's geologic time scale, and it is subdivided into three geologic eras (from oldest to youngest): the Paleoproterozoic, Mesoproterozoic, and Neoproterozoic. The Proterozoic covers the time from the appearance of oxygen in Earth's atmosphere to just before the proliferation of complex life (such as trilobites or corals) on the Earth. The name ''Proterozoic'' combines two forms of ultimately Greek origin: meaning 'former, earlier', and , 'of life'. The well-identified events of this eon were the transition to an oxygenated atmosphere during the Paleoproterozoic; the evolution of eukaryotes; several glaciations, which produced the hypothesized Snowball Earth during the Cryogenian Period in the late Neoproterozoic Era; and the Ediacaran Period (635 to 538.8 Ma) which is chara ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Difflugiella
''Cryptodifflugia'' is a genus of arcellinid testate amoebae. It contains all the species previously grouped as the genus ''Difflugiella'', which is now a synonym of ''Cryptodifflugia''. Description ''Cryptodifflugia'' species are characterized by a shell with an oval egg-like shape with a short neck. Their surface is either smooth or adhering foreign particles. The shell can be colorless, yellow or brown, composed of an outer proteinaceous material that is usually lined. The shell's aperture is terminal, and has either a circular or an oval shape. They present pseudopods in the form of ectoplasmic anastomosing reticulopods, i.e. like fine threads that can branch or anastomose (meaning they can form links with each other) to create a dense network. Classification The classification of the genus, as revised in 2017, identifies 23 species along with some subspecies: *'' Cryptodifflugia angulata'' Playfair, 1917 – Australia *'' Cryptodifflugia angusta'' (Schönborn, 1965) Page ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
