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Nematostella
''Nematostella'' is a genus of sea anemones in the family Edwardsiidae. Of the three species in the genus, the best known is the starlet sea anemone (''N. vectensis''), which has been extensively studied as a model organism in fields such as genetics, evolution, and ecology. The defining morphological apomorphy of ''Nematostella'' is the presence of nematosomes. Species: ''In'': Fautin, D. G. 2011. ''Hexacorallians of the World''. Accessed through: World Register of Marine Species (WoRMS). 2014. * '''' (Carlgren, 1921) * '' |
Starlet Sea Anemone
The starlet sea anemone (''Nematostella vectensis'') is a species of small sea anemone in the Family (biology), family Edwardsiidae native to the east coast of the United States, with introduced populations along the coast of southeast England and the west coast of the United States (class ''Anthozoa'', phylum ''Cnidaria'', a sister group of Bilateria). Populations have also been located in Nova Scotia, Canada. This sea anemone is found in the shallow brackish water of coastal lagoons and salt marshes where its slender column is usually buried in the mud and its tentacles exposed. Its genome has been sequenced and it is cultivated in the laboratory as a model organism, but the IUCN has listed it as being a "Vulnerable species" in the wild. Description The starlet sea anemone has a bulbous basal end and a contracting column that ranges in length from less than . There is a fairly distinct division between the scapus, the main part of the column, and the capitulum, the part just bel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Starlet Sea Anemone
The starlet sea anemone (''Nematostella vectensis'') is a species of small sea anemone in the Family (biology), family Edwardsiidae native to the east coast of the United States, with introduced populations along the coast of southeast England and the west coast of the United States (class ''Anthozoa'', phylum ''Cnidaria'', a sister group of Bilateria). Populations have also been located in Nova Scotia, Canada. This sea anemone is found in the shallow brackish water of coastal lagoons and salt marshes where its slender column is usually buried in the mud and its tentacles exposed. Its genome has been sequenced and it is cultivated in the laboratory as a model organism, but the IUCN has listed it as being a "Vulnerable species" in the wild. Description The starlet sea anemone has a bulbous basal end and a contracting column that ranges in length from less than . There is a fairly distinct division between the scapus, the main part of the column, and the capitulum, the part just bel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nematostella Nathorstii
''Nematostella'' is a genus of sea anemones in the family Edwardsiidae. Of the three species in the genus, the best known is the starlet sea anemone (''N. vectensis''), which has been extensively studied as a model organism in fields such as genetics, evolution, and ecology. The defining morphological apomorphy of ''Nematostella'' is the presence of nematosomes. Species: ''In'': Fautin, D. G. 2011. ''Hexacorallians of the World''. Accessed through: World Register of Marine Species (WoRMS). 2014. * '''' (Carlgren, 1921) * '' |
Nematostella Polaris
''Nematostella'' is a genus of sea anemones in the family Edwardsiidae. Of the three species in the genus, the best known is the starlet sea anemone (''N. vectensis''), which has been extensively studied as a model organism in fields such as genetics, evolution, and ecology. The defining morphological apomorphy of ''Nematostella'' is the presence of nematosomes. Species: ''In'': Fautin, D. G. 2011. ''Hexacorallians of the World''. Accessed through: World Register of Marine Species (WoRMS). 2014. * '''' (Carlgren, 1921) * '' |
Nematosome
Nematosomes are multicellular motile bodies found in the gastrovascular cavity of the model sea anemone ''Nematostella vectensis'' starlet sea anemone. First described by Stephenson in 1935, nematosomes are the defining apomorphy (synapomorphy) of the genus ''Nematostella'' but have received relatively little study. Nematosomes can be observed circulating through the body cavity and tentacle lumen of adult anemones, occasionally coming to rest on the gastrodermis. Nematosomes that are dislodged from rest return to circulation. The lifespan of a single nematosome has not been studied. Development Nematosomes arise by budding from the cnidoglandular tract of the mesenteries in ''N. vectensis''; thus, they are of ectodermal origin. Although material can be seen circulating in the gastrovascular cavity from the onset of body cavity development, true nematosomes do not appear until approximately the same time that the polyp reaches sexual maturity. Inspection of the jelly matrix surround ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Edwardsiidae
Edwardsiidae is a family of sea anemones. Edwardsiids have long thin bodies and live buried in sediments or in holes or crevices in rock. Genera The following genera are recognized within the family Edwardsiidae. * '' Drillactis'' Verrill, 1922 * ''Edwardsia'' Quatrefages, 1842 * '' Edwardsianthus'' England, 1987 * '' Edwardsiella'' Andres, 1883 * '' Halcampogeton'' Carlgren, 1937 * '' Isoedwardsia'' Carlgren, 1900 * '' Milne-Edwardsia'' Carlgren, 1892 * ''Nematostella ''Nematostella'' is a genus of sea anemones in the family Edwardsiidae. Of the three species in the genus, the best known is the starlet sea anemone (''N. vectensis''), which has been extensively studied as a model organism in fields such as ...'' Stephenson, 1935 * '' Paraedwardsia'' Carlgren in Nordgaard, 1905 * '' Scolanthus'' Gosse, 1853 * '' Synhalcampella'' * '' Tempuractis'' References Actiniaria Cnidarian families Taxa named by Angelo Andres {{Actiniaria-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sea Anemone
Sea anemones are a group of predation, predatory marine invertebrates of the order (biology), order Actiniaria. Because of their colourful appearance, they are named after the ''Anemone'', a terrestrial flowering plant. Sea anemones are classified in the phylum Cnidaria, class Anthozoa, subclass Hexacorallia. As cnidarians, sea anemones are related to corals, jellyfish, tube-dwelling anemones, and ''hydra (genus), Hydra''. Unlike jellyfish, sea anemones do not have a Jellyfish#Life history and behavior, medusa stage in their life cycle. A typical sea anemone is a single polyp (zoology), polyp attached to a hard surface by its base, but some species live in soft sediment, and a few float near the surface of the water. The polyp has a columnar trunk topped by an oral disc with a ring of tentacles and a central mouth. The tentacles can be retracted inside the body cavity or expanded to catch passing prey. They are armed with cnidocytes (stinging cells). In many species, additional n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Model Organism
A model organism (often shortened to model) is a non-human species that is extensively studied to understand particular biological phenomena, with the expectation that discoveries made in the model organism will provide insight into the workings of other organisms. Model organisms are widely used to research human disease when human experimentation would be unfeasible or unethical. This strategy is made possible by the common descent of all living organisms, and the conservation of metabolic and developmental pathways and genetic material over the course of evolution. Studying model organisms can be informative, but care must be taken when generalizing from one organism to another. In researching human disease, model organisms allow for better understanding the disease process without the added risk of harming an actual human. The species chosen will usually meet a determined taxonomic equivalency to humans, so as to react to disease or its treatment in a way that resembles ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Apomorphy
In phylogenetics, an apomorphy (or derived trait) is a novel character or character state that has evolved from its ancestral form (or plesiomorphy). A synapomorphy is an apomorphy shared by two or more taxa and is therefore hypothesized to have evolved in their most recent common ancestor. ) In cladistics, synapomorphy implies homology. Examples of apomorphy are the presence of erect gait, fur, the evolution of three middle ear bones, and mammary glands in mammals but not in other vertebrate animals such as amphibians or reptiles, which have retained their ancestral traits of a sprawling gait and lack of fur. Thus, these derived traits are also synapomorphies of mammals in general as they are not shared by other vertebrate animals. Etymology The word —coined by German entomologist Willi Hennig—is derived from the Ancient Greek words (''sún''), meaning "with, together"; (''apó''), meaning "away from"; and (''morphḗ''), meaning "shape, form". Clade analysis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
