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Vorticella Natans
''Vorticella'' is a genus of bell-shaped ciliates that have stalks to attach themselves to substrates. The stalks have contractile myonemes, allowing them to pull the cell body against substrates. The formation of the stalk happens after the free-swimming stage. Etymology The organism is named ''Vorticella'' due to the beating cilia creating whirlpools, or vortices. It is also known as the “Bell Animalcule” due to its bell-shaped body. History ''Vorticella'' was first described by Antonie van Leeuwenhoek in a letter dated October 9, 1676. Leeuwenhoek thought that ''Vorticella'' had two horns moving like horse ears near the oral part, which turned out to be oral cilia beating to create water flow. In 1755, German miniature painter August Johann Rösel described ''Vorticella'', which was named ''Hydra convallaria'' by Linnaeus in 1758. However, in 1767, it was renamed ''Vorticella convallaria''. Otto Friedrich Müller listed 127 species of ''Vorticella'' in 1786, but many ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Christian Gottfried Ehrenberg
Christian Gottfried Ehrenberg (19 April 1795 – 27 June 1876) was a German naturalist, zoologist, comparative anatomist, geologist, and microscopist. Ehrenberg was an evangelist and was considered to be of the most famous and productive scientists of his time. Early collections The son of a judge, Christian Gottfried Ehrenberg was born in Delitzsch, near Leipzig. He first studied theology at the University of Leipzig, then medicine and natural sciences in Berlin and became a friend of the famous explorer Alexander von Humboldt. In 1818, he completed his doctoral dissertation on fungi, ''Sylvae mycologicae Berolinenses.'' In 1820–1825, on a scientific expedition to the Middle East with his friend Wilhelm Hemprich, he collected thousands of specimens of plants and animals. He investigated parts of Egypt, the Libyan Desert, the Nile valley and the northern coasts of the Red Sea, where he made a special study of the corals. Subsequently, parts of Syria, Arabia and Abyss ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Timber Peak
Timber Peak () is the high peak (3,070 m) above Priestley Glacier, on the south side. The peak is 2 nautical miles (3.7 km) west-northwest of the summit of Mount New Zealand in the Eisenhower Range, Victoria Land. The Southern Party of New Zealand Geological Survey Antarctic Expedition The New Zealand Geological Survey Antarctic Expedition (NZGSAE) describes a series of scientific explorations of the continent Antarctica. The expeditions were notably active throughout the 1950s and 1960s. Features named by the expeditions 1957 ... (NZGSAE) (1962–63) gave this name because petrified sections of tree branches were found in sandstone deposits at this point. Mountains of Victoria Land Scott Coast {{ScottCoast-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vorticella Elongata
''Vorticella'' is a genus of bell-shaped ciliates that have stalks to attach themselves to substrates. The stalks have contractile myonemes, allowing them to pull the cell body against substrates. The formation of the stalk happens after the free-swimming stage. Etymology The organism is named ''Vorticella'' due to the beating cilia creating whirlpools, or vortices. It is also known as the “Bell Animalcule” due to its bell-shaped body. History ''Vorticella'' was first described by Antonie van Leeuwenhoek in a letter dated October 9, 1676. Leeuwenhoek thought that ''Vorticella'' had two horns moving like horse ears near the oral part, which turned out to be oral cilia beating to create water flow. In 1755, German miniature painter August Johann Rösel described ''Vorticella'', which was named ''Hydra convallaria'' by Linnaeus in 1758. However, in 1767, it was renamed ''Vorticella convallaria''. Otto Friedrich Müller listed 127 species of ''Vorticella'' in 1786, but many ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vorticella Convallaria Compacta
''Vorticella'' is a genus of bell-shaped ciliates that have stalks to attach themselves to substrates. The stalks have contractile myonemes, allowing them to pull the cell body against substrates. The formation of the stalk happens after the free-swimming stage. Etymology The organism is named ''Vorticella'' due to the beating cilia creating whirlpools, or vortices. It is also known as the “Bell Animalcule” due to its bell-shaped body. History ''Vorticella'' was first described by Antonie van Leeuwenhoek in a letter dated October 9, 1676. Leeuwenhoek thought that ''Vorticella'' had two horns moving like horse ears near the oral part, which turned out to be oral cilia beating to create water flow. In 1755, German miniature painter August Johann Rösel described ''Vorticella'', which was named ''Hydra convallaria'' by Linnaeus in 1758. However, in 1767, it was renamed ''Vorticella convallaria''. Otto Friedrich Müller listed 127 species of ''Vorticella'' in 1786, but many ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vorticella Convallaria
''Vorticella convallaria'' is a species of ciliates. It is the type species of the genus ''Vorticella''. It resembles '' V. campanula'', but differs in being somewhat narrow in the anterior end and usually having no refractile granules in the endoplasm. ''Vorticella convallaria'' exhibits two morphological types. The primary type is the sessile trophont stalked zooid. When environmental conditions deteriorate the stalked zooid excises its stalk and transforms into ''Vorticella's'' secondary type, the motile dispersive telotroch. When the telotroch finds suitable environs it reattaches to the substrate and transforms back into a stalked zooid. The cell body of this species is 50-95 μm long and 35-53 μm wide. The peristome ranges from 55-75 μm in diameter. The rod-like, contractile stalk - the "spasmoneme" - is 25-300 μm long and 4 μm wide. It can collapse into a tightly coiled helix A helix () is a shape like a corkscrew or spiral staircase. It is a type of smooth spac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vorticella Citrina
''Vorticella convallaria'' is a species of ciliates. It forms part of the '' V. convallaria'' species complex In biology, a species complex is a group of closely related organisms that are so similar in appearance and other features that the boundaries between them are often unclear. The taxa in the complex may be able to hybridize readily with each oth .... ''V. citrina'' is lemon yellow to light green in colour. External linksFreshwater and terrestrial microbes of Idaho: ''Vorticella citrina'' Oligohymenophorea Species described in 1786 {{ciliate-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vorticella Chlorostigma
''Vorticella'' is a genus of bell-shaped ciliates that have stalks to attach themselves to substrates. The stalks have contractile myonemes, allowing them to pull the cell body against substrates. The formation of the stalk happens after the free-swimming stage. Etymology The organism is named ''Vorticella'' due to the beating cilia creating whirlpools, or vortices. It is also known as the “Bell Animalcule” due to its bell-shaped body. History ''Vorticella'' was first described by Antonie van Leeuwenhoek in a letter dated October 9, 1676. Leeuwenhoek thought that ''Vorticella'' had two horns moving like horse ears near the oral part, which turned out to be oral cilia beating to create water flow. In 1755, German miniature painter August Johann Rösel described ''Vorticella'', which was named ''Hydra convallaria'' by Linnaeus in 1758. However, in 1767, it was renamed ''Vorticella convallaria''. Otto Friedrich Müller listed 127 species of ''Vorticella'' in 1786, but many ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vorticella Campanula
The protozoon ''Vorticella campanula'' is found in freshwater ponds, lakes, rivers, and streams with aquatic vegetation. It has a global distribution. ''Vorticella campanula'' is solitary and not colonial but usually social, several of them being found together. ''Vorticella campanula'' is a sedentary (fixed) form. It is commonly attached by a long highly contractile stalk to some submerged objects like weeds, animals, or stones. ''Vorticella campanula'' is often found in large groups. All the individuals in the group, however, remain free and independent of each other. Most ''Vorticella'' are found in abundance in stagnant water rich in decaying organic matter and feed largely on bacteria Bacteria (; singular: bacterium) are ubiquitous, mostly free-living organisms often consisting of one biological cell. They constitute a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bacteria were among ..., but ''Vorticella campanula'' live only i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vorticella Aequilata
''Vorticella'' is a genus of bell-shaped ciliates that have stalks to attach themselves to substrates. The stalks have contractile myonemes, allowing them to pull the cell body against substrates. The formation of the stalk happens after the free-swimming stage. Etymology The organism is named ''Vorticella'' due to the beating cilia creating whirlpools, or vortices. It is also known as the “Bell Animalcule” due to its bell-shaped body. History ''Vorticella'' was first described by Antonie van Leeuwenhoek in a letter dated October 9, 1676. Leeuwenhoek thought that ''Vorticella'' had two horns moving like horse ears near the oral part, which turned out to be oral cilia beating to create water flow. In 1755, German miniature painter August Johann Rösel described ''Vorticella'', which was named ''Hydra convallaria'' by Linnaeus in 1758. However, in 1767, it was renamed ''Vorticella convallaria''. Otto Friedrich Müller listed 127 species of ''Vorticella'' in 1786, but many ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clade
A clade (), also known as a monophyletic group or natural group, is a group of organisms that are monophyletic – that is, composed of a common ancestor and all its lineal descendants – on a phylogenetic tree. Rather than the English term, the equivalent Latin term ''cladus'' (plural ''cladi'') is often used in taxonomical literature. The common ancestor may be an individual, a population, or a species (extinct or extant). Clades are nested, one in another, as each branch in turn splits into smaller branches. These splits reflect evolutionary history as populations diverged and evolved independently. Clades are termed monophyletic (Greek: "one clan") groups. Over the last few decades, the cladistic approach has revolutionized biological classification and revealed surprising evolutionary relationships among organisms. Increasingly, taxonomists try to avoid naming taxa that are not clades; that is, taxa that are not monophyletic. Some of the relationships between organisms ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
