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Corbicula
''Corbicula'' is a genus of freshwater and brackish water clams, aquatic bivalve mollusks in the family Cyrenidae, the basket clams.Gofas, S. (2015). Cyrenidae Gray, 1847. In: MolluscaBase (2015). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=238370 on 2015-08-26 The genus name is the Neo-Latin diminutive of Latin ''corbis'', a basket, referring to the shape and ribs of the shell. The genus ''Corbicula'' includes numerous extant and fossil species; the status of several of them is unclear (''species inquirenda'').MolluscaBase eds. (2022). ''Corbicula'' Megerle von Mühlfeld, 1811. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=238371 on 2022-05-29 The best known is '' Corbicula fluminea'', an invasive species in many areas of the world. Unusually, some members reproduce via androgenesis, wherein all genes are inherited from the male, one of the very ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Corbicula Fluminea
''Corbicula fluminea'' is a species of freshwater clam native to eastern Asia which has become a successful invasive species throughout the world, including North America, South America, Europe, and New Zealand. It is native to freshwater environments of Eastern Asia, including Russia, Thailand, the Philippines, China, Taiwan, Korea, and Japan. ''C. fluminea'' also occurs naturally in freshwater environments of Africa. (2001): Nonindigenous species information bulletin: Asian clam, ''Corbicula fluminea'' (Müller, 1774) (Mollusca: Corbiculidae)PDF fulltext/ref> ''Corbicula fluminea'' is commonly known in the west as the Asian clam, Asiatic clam, or Asian gold clam. In Southeast Asia, ''C. fluminea'' is known as the golden clam, prosperity clam, pygmy clam, or good luck clam. In New Zealand, it is commonly referred as the freshwater gold clam. Right and left valve of the same specimen: File:Corbicula fluminea 01.jpg, Right valve File:Corbicula fluminea 02.jpg, Left valve Ove ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Corbicula Japonica
''Corbicula japonica'' is an edible species of brackishwater clam, a bivalve mollusk in the family Cyrenidae, the basket clams. Its common names include Japanese basket clam, Japanese blue clam, and shijimi (its Japanese name). Summary Japanese basket clams settle at the mouths of rivers in brackish water. During low tide, people are able to see them in tidal flats and collect them for food. Their shells are roughly 30-35mm and are reddish-brown while young, turning black as they mature. Their shells are glossy and have a tendency to grow concentric circles from their base, similar to ''Corbicula fluminea''. The inside of their shells is purple when they are young and becomes white as they mature. Their reproduction is based on gonochorism. Culinary Use Japan In Japan, the clam is usually called ''shijimi'', though this technically refers to the ''Corbicula'' genus in general. The more precise name is ''yamato-shijimi'' ("Japanese ''corbicula''"). ''Shijimi'' and ''asari'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Corbicula Leana
''Corbicula leana'', known as ''chamjaecheop'' (; "true '' jaecheop''") in Korean and as ''mashijimi'' (; "true '' shijimi''") in Japanese, is a species of freshwater and brackish water clams, distributed in the Korean Peninsula and the Japanese archipelago. Culinary use In Korean cuisine, ''Corbicula leana'' are used in a clam soup known as ''jaecheop-guk''. File:Jaecheop-guk.png, ''Jaecheop-guk ''Jaecheop-guk'' () is a clear '' guk'' (soup) made with ''jaecheop'', small freshwater marsh clams native to Korea. The soup is considered a local specialty of Yeongnam and Honam regions, where ''jaecheop'' are harvested in the lower reaches ...'' File:Jaecheop-sujebi 2.jpg, ''Jaecheop- sujebi'' References Molluscs described in 1867 Cyrenidae Korean seafood Molluscs of the Pacific Ocean {{Bivalve-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Androgenesis
Androgenesis is a system of asexual reproduction that requires the presence of eggs and occurs when a zygote is produced with only paternal nuclear genes. During standard sexual reproduction, one female parent and one male parent each produce haploid gametes (such as a sperm or egg cell, each containing only a single set of chromosomes), which recombine to create offspring with genetic material from both parents. However, in androgenesis, there is no recombination of maternal and paternal chromosomes, and only the paternal chromosomes are passed down to the offspring. (The inverse of this is gynogenesis, where only the maternal chromosomes are inherited, which is more common than androgenesis). The offspring produced in androgenesis will still have maternally inherited mitochondria, as is the case with most sexually reproducing species. One of two things can occur to produce offspring with exclusively paternal genetic material: the maternal nuclear genome can be eliminated fr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cyrenidae
Cyrenidae is a family of clams in the order Venerida.Gofas, S. (2015). Cyrenidae Gray, 1847. In: MolluscaBase (2015). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=238370 on 2015-08-26 Genera Genera within this family include: * '' Batissa'' Gray, 1853 * ''Corbicula'' Megerle von Mühlfeld, 1811 * '' Cyanocyclas'' Blainville, 1818 * '' Geloina'' Gray, 1842 * '' Polymesoda'' Rafinesque, 1820 * '' Villorita'' Gray, 1833 ;Taxa brought into synonymy: * †''Cyrenida ''Corbicula'' is a genus of freshwater and brackish water clams, aquatic bivalve mollusks in the family Cyrenidae, the basket clams.Gofas, S. (2015). Cyrenidae Gray, 1847. In: MolluscaBase (2015). Accessed through: World Register of Marine Sp ...'': synonym of ''Corbicula'' Megerle von Mühlfeld, 1811 * Subfamily Polymesodinae Habe, 1977: synonym of Cyrenidae Gray, 1847 References * Bieler R., Carter J.G. & Coan E.V. 2010: Classification of Bivalve ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clam
Clam is a common name for several kinds of bivalve mollusc. The word is often applied only to those that are deemed edible and live as infauna, spending most of their lives halfway buried in the sand of the sea floor or riverbeds. Clams have two shells of equal size connected by two adductor muscles and have a powerful burrowing foot. They live in both freshwater and marine environments; in salt water they prefer to burrow down into the mud and the turbidity of the water required varies with species and location; the greatest diversity of these is in North America. Clams in the culinary sense do not live attached to a substrate (whereas oysters and mussels do) and do not live near the bottom (whereas scallops do). In culinary usage, clams are commonly eaten marine bivalves, as in clam digging and the resulting soup, clam chowder. Many edible clams such as palourde clams are ovoid or triangular; however, razor clams have an elongated parallel-sided shell, suggesting ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Johann Carl Megerle Von Mühlfeld
Johann Carl Megerle von Mühlfeld (1765 – 12 September 1840) was an Austrian naturalist who served as the first curator of insects at the Imperial Natural History Cabinet in Vienna. He took a special interest in molluscs. The genus ''Megerlia'' is named after him. Megerle was the son of Johann Baptist Megerle (1742–1813) who was ennobled as von Mühlfeld in 1803. He was a brother of Johann Georg Megerle von Mühlfeld. He collected natural history specimens which he sold to the Imperial Natural History Cabinet in 1808. He worked at the cabinet from 1786 in an honorary position along with Andreas Xaverius Stütz and in 1792 he became a custodian for the mineral collection. In 1797 he became the first curator of insects. From 1798 to 1806 he was involved in trading natural history specimens at the Bürgerspital. He named insects in the catalogues of the auction but these names are not to be used for taxonomic purposes. He collected insects and minerals both on his own and throug ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dioecy
Dioecy ( ; ; adj. dioecious, ) is a characteristic of certain species that have distinct unisexual individuals, each producing either male or female gametes, either directly (in animals) or indirectly (in seed plants). Dioecious reproduction is biparental reproduction. Dioecy has costs, since only the female part of the population directly produces offspring. It is one method for excluding self-fertilization and promoting allogamy (outcrossing), and thus tends to reduce the expression of recessive deleterious mutations present in a population. Plants have several other methods of preventing self-fertilization including, for example, dichogamy, herkogamy, and self-incompatibility. In zoology In zoology, dioecy means that an animal is either male or female, in which case the synonym gonochory is more often used. Most animal species are gonochoric, almost all vertebrate species are gonochoric, and all bird and mammal species are gonochoric. Dioecy may also describe colonies ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flagellum
A flagellum (; : flagella) (Latin for 'whip' or 'scourge') is a hair-like appendage that protrudes from certain plant and animal sperm cells, from fungal spores ( zoospores), and from a wide range of microorganisms to provide motility. Many protists with flagella are known as flagellates. A microorganism may have from one to many flagella. A gram-negative bacterium '' Helicobacter pylori'', for example, uses its flagella to propel itself through the stomach to reach the mucous lining where it may colonise the epithelium and potentially cause gastritis, and ulcers – a risk factor for stomach cancer. In some swarming bacteria, the flagellum can also function as a sensory organelle, being sensitive to wetness outside the cell. Across the three domains of Bacteria, Archaea, and Eukaryota, the flagellum has a different structure, protein composition, and mechanism of propulsion but shares the same function of providing motility. The Latin word means " whip" to describe its ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ploidy
Ploidy () is the number of complete sets of chromosomes in a cell, and hence the number of possible alleles for autosomal and pseudoautosomal genes. Here ''sets of chromosomes'' refers to the number of maternal and paternal chromosome copies, respectively, in each homologous chromosome pair—the form in which chromosomes naturally exist. Somatic cells, tissues, and individual organisms can be described according to the number of sets of chromosomes present (the "ploidy level"): monoploid (1 set), diploid (2 sets), triploid (3 sets), tetraploid (4 sets), pentaploid (5 sets), hexaploid (6 sets), heptaploid or septaploid (7 sets), etc. The generic term polyploid is often used to describe cells with three or more sets of chromosomes. Virtually all sexually reproducing organisms are made up of somatic cells that are diploid or greater, but ploidy level may vary widely between different organisms, between different tissues within the same organism, and at different stages in an o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polar Body
A polar body is a small haploid cell that is formed at the same time as an egg cell during oogenesis, but generally does not have the ability to be fertilized. It is named from its polar position in the egg. When certain diploid cells in animals undergo cytokinesis after meiosis to produce egg cells, they sometimes divide unevenly. Most of the cytoplasm is segregated into one daughter cell, which becomes the egg or ovum, while the smaller ''polar bodies'' only get a small amount of cytoplasm. They frequently die and disintegrate by apoptosis, but in some cases remain and can be important in the life cycle of the organism. Twinning ''Polar body twinning'' is a hypothesized form of twinning in meiosis, where one or more polar bodies do not disintegrate and are fertilized by sperm. Twinning would occur, in principle, if the egg cell and a polar body were both fertilized by separate sperms. However, even if fertilization occurred, further development would usually not occur becau ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hermaphrodite
A hermaphrodite () is a sexually reproducing organism that produces both male and female gametes. Animal species in which individuals are either male or female are gonochoric, which is the opposite of hermaphroditic. The individuals of many taxonomic groups of animals, primarily invertebrates, are hermaphrodites, capable of producing viable gametes of both sexes. In the great majority of tunicates, mollusks, and earthworms, hermaphroditism is a normal condition, enabling a form of sexual reproduction in which either partner can act as the female or male. Hermaphroditism is also found in some fish species, but is rare in other vertebrate groups. Most hermaphroditic species exhibit some degree of self-fertilization. The distribution of self-fertilization rates among animals is similar to that of plants, suggesting that similar pressures are operating to direct the evolution of selfing in animals and plants. A rough estimate of the number of hermaphroditic animal species ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
