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Margarya Francheti
''Margarya francheti'' is a species of large operculate freshwater snail, an aquatic gastropod mollusc in the family Viviparidae, the river snails. Taxonomy He J.(2013) introduced a new subgenus, ''Mabillemargarya'', for ''M. francheti''; however, this taxonomic act is not supported by comparative morphology and molecular phylogenetics. Therefore, ''Mabillemargarya'' is considered as a junior synonym of '' Margarya''. Distribution The distribution of ''Margarya francheti'' includes Dian Lake, Erhai Lake, Jianhu Lake in Yunnan Province, China. Description Zhang et al. (2015) provided details about the shell and about the radula The radula (, ; plural radulae or radulas) is an anatomical structure used by molluscs for feeding, sometimes compared to a tongue. It is a minutely toothed, chitinous ribbon, which is typically used for scraping or cutting food before the food .... References External links Zhang L.J. [Le-Jia], Chen S.C. [Shi-Chao], Yang L. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zoological Journal Of The Linnean Society
The ''Zoological Journal of the Linnean Society'' is a monthly peer-reviewed scientific journal covering zoology published by Oxford University Press on behalf of the Linnean Society. The editor-in-chief is Maarten Christenhusz (Linnean Society). It was established in 1856 as the ''Journal of the Proceedings of the Linnean Society of London. Zoology'' and renamed ''Journal of the Linnean Society of London, Zoology'' in 1866. It obtained its current title in 1969. Abstracting and indexing The journal is abstracted and indexed in: According to the ''Journal Citation Reports'', the journal has a 2020 impact factor The impact factor (IF) or journal impact factor (JIF) of an academic journal is a scientometric index calculated by Clarivate that reflects the yearly mean number of citations of articles published in the last two years in a given journal, as i ... of 3.286. References External links * Zoology journals Linnean Society of London Monthly journals Academic journa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Species
In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. Other ways of defining species include their karyotype, DNA sequence, morphology, behaviour or ecological niche. In addition, paleontologists use the concept of the chronospecies since fossil reproduction cannot be examined. The most recent rigorous estimate for the total number of species of eukaryotes is between 8 and 8.7 million. However, only about 14% of these had been described by 2011. All species (except viruses) are given a two-part name, a "binomial". The first part of a binomial is the genus to which the species belongs. The second part is called the specific name or the specific epithet (in botanical nomenclature, also sometimes i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Operculum (gastropod)
The operculum (; ) is a corneous or calcareous anatomical structure like a trapdoor that exists in many (but not all) groups of sea snails and freshwater snails, and also in a few groups of land snails; the structure is found in some marine and freshwater gastropods, and in a minority of terrestrial gastropods, including the families Helicinidae, Cyclophoridae, Aciculidae, Maizaniidae, Pomatiidae, etc. The operculum is attached to the upper surface of the foot and in its most complete state, it serves as a sort of "trapdoor" to close the aperture of the shell when the soft parts of the animal are retracted. The shape of the operculum varies greatly from one family of gastropods to another. It is fairly often circular, or more or less oval in shape. In species where the operculum fits snugly, its outline corresponds exactly to the shape of the aperture of the shell and it serves to seal the entrance of the shell. Many families have opercula that are reduced in size, and which a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Freshwater Snail
Freshwater snails are gastropod mollusks which live in fresh water. There are many different families. They are found throughout the world in various habitats, ranging from ephemeral pools to the largest lakes, and from small seeps and springs to major rivers. The great majority of freshwater gastropods have a shell, with very few exceptions. Some groups of snails that live in freshwater respire using gills, whereas other groups need to reach the surface to breathe air. In addition, some are amphibious and have both gills and a lung (e.g. ''Ampullariidae''). Most feed on algae, but many are detritivores and some are filter feeders. According to a 2008 review of the taxonomy, there are about 4,000 species of freshwater gastropods (3,795–3,972). At least 33–38 independent lineages of gastropods have successfully colonized freshwater environments. It is not possible to quantify the exact number of these lineages yet, because they have yet to be clarified within the Cerit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aquatic Animal
An aquatic animal is any animal, whether invertebrate or vertebrate, that lives in water for most or all of its lifetime. Many insects such as mosquitoes, mayflies, dragonflies and caddisflies have aquatic larvae, with winged adults. Aquatic animals may breathe air or extract oxygen from water through specialised organs called gills, or directly through the skin. Natural environments and the animals that live in them can be categorized as aquatic (water) or terrestrial (land). This designation is polyphyletic. Description The term aquatic can be applied to animals that live in either fresh water or salt water. However, the adjective marine is most commonly used for animals that live in saltwater, i.e. in oceans, seas, etc. Aquatic animals (especially freshwater animals) are often of special concern to conservationists because of the fragility of their environments. Aquatic animals are subject to pressure from overfishing, destructive fishing, marine pollution, hunting, and cli ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gastropod
The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, from freshwater, and from land. There are many thousands of species of sea snails and slugs, as well as freshwater snails, freshwater limpets, and land snails and slugs. The class Gastropoda contains a vast total of named species, second only to the insects in overall number. The fossil history of this class goes back to the Late Cambrian. , 721 families of gastropods are known, of which 245 are extinct and appear only in the fossil record, while 476 are currently extant with or without a fossil record. Gastropoda (previously known as univalves and sometimes spelled "Gasteropoda") are a major part of the phylum Mollusca, and are the most highly diversified class in the phylum, with 65,000 to 80,000 living snail and slug species. The anatomy, behavior, feeding, and re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mollusc
Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000 extant species of molluscs are recognized. The number of fossil species is estimated between 60,000 and 100,000 additional species. The proportion of undescribed species is very high. Many taxa remain poorly studied. Molluscs are the largest marine phylum, comprising about 23% of all the named marine organisms. Numerous molluscs also live in freshwater and terrestrial habitats. They are highly diverse, not just in size and anatomical structure, but also in behaviour and habitat. The phylum is typically divided into 7 or 8 taxonomic classes, of which two are entirely extinct. Cephalopod molluscs, such as squid, cuttlefish, and octopuses, are among the most neurologically advanced of all invertebrates—and either the giant squid or the colossal squid is the largest known invertebrate species. The gastropods ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Viviparidae
Viviparidae, sometimes known as the river snails or mystery snails, are a family of large operculate freshwater snails, aquatic gastropod mollusks. This family is classified in the informal group Architaenioglossa according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005. Distribution This family occurs nearly worldwide in temperate and tropical regions, with the exception that they are absent from South America. There are two genera of Viviparidae in Africa: ''Bellamya'' and ''Neothauma''. The oldest known vivparid is ''Viviparus langtonensis'' from the Middle Jurassic of England. The oldest records from the Southern Hemisphere is from the Late Jurassic Talbragar fossil beds of Australia. Taxonomy The family Viviparidae contains 3 subfamilies (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005): * Viviparinae Gray, 1847 (1833) - synonyms: Paludinidae Fitzinger, 1833 (inv.); Kosoviinae Atanackovic, 1859 (n.a.) * Bellamyinae Rohrbach, 193 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shell Discoveries
Shell may refer to: Architecture and design * Shell (structure), a thin structure ** Concrete shell, a thin shell of concrete, usually with no interior columns or exterior buttresses ** Thin-shell structure Science Biology * Seashell, a hard outer layer of a marine animal, found on beaches * Eggshell * Nutshell * Exoskeleton, an external covering of some animals ** Mollusc shell *** Bivalve shell *** Gastropod shell ** Shell, of a brachiopod ** Turtle shell Physics and chemistry * Electron shell or a principal energy level of electrons outside an atom's nucleus * Nuclear shell model, a principal energy level of nucleons within an atom's nucleus * On shell and off shell, quantum field theory concepts depending on whether classical equations of motion are obeyed Mathematics * Spherical shell Organisations * Shell plc, a British multinational oil and gas company ** Shell USA ** Shell Australia ** Shell Canada ** Shell Nigeria * Shell corporation, a type of compan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Margarya
''Margarya'' is a genus of large operculate freshwater snails, aquatic gastropod mollusks in the family Viviparidae.Bouchet, P. (2014). Margarya G. Nevill, 1877. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=758767 on 2014-12-10 Taxonomy The genus ''Margarya'' was described by Nevill (1877) based on shells of the type species collected by A.R. Margary from Lake Erhai, the type locality of ''Margarya melanioides''. Based on shell and radular morphology, Tchang & Tsi (1949) revised this genus for the first time and recognized seven distinct species. He created two subgenera of ''Margarya'' , viz ''Tchangmargarya'' and ''Mabillemargarya''. The first molecular phylogeny showed that the genus ''Margarya'' is polyphyletic and divided into three distinct clades. Combining study of comparative morphology and molecular phylogeny, Zhang ''et al''. revised the systematics of ''Margarya'' and recognized eight genuine extant sp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dian Lake
Dianchi Lake (), also known as Lake Dian and Kunming Lake (), is a large lake located on the Yunnan-Guizhou Plateau close to Kunming, Yunnan, China. Its nickname is the "Sparkling Pearl Embedded in a Highland" () and it was the model for the Kunming Lake in the Summer Palace in Beijing. Its name is the source of Yunnan's Chinese abbreviation . It is a freshwater fault lake at above sea level. The lake covers . It is long from north to south, and the average depth is . It is the eighth largest lake in China and the largest in Yunnan Province. Etymology The Chinese character for the lake is a phonosemantic compound of the radical ("water") and the character , whose current pronunciation is ''zhēn'' but whose Old Chinese pronunciation has been reconstructed as ''*tin'' in Baxter–Sagart system.Baxter, William & al. "Baxter-Sagart Old Chinese Reconstruction"p. 160. 2011. Accessed 15 November 2013. The character was first found in the ''Records of the Grand Historian'' as the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Erhai Lake
Erhai or Er Lake (), is an alpine fault lake in Yunnan province, China. Erhai was also known as Yeyuze () or Kunming Lake () in ancient times. Etymology The character "æ´±" (er) does not have the same meaning as ear (耳). During the Han to Tang dynasty, there was an ancient ethnic named ''Kunming Yi'' or Kunming Barbarian () lived in the neighbouring region of Erhai lake. Therefore, the lake was also called "Kunming Lake". The ''Kunming Yi'' has another name ''Kun-mi'' (). In the following time, Chinese literature recorded the name "昆弥" as "昆å¼" (Kun-mi) that "å¼" is a rebus of "å¼¥". And the name of the lake was also be changed to the character "渳" (mi) which has a water-meaning radical () attached to it. Fang Guoyu believe the name "æ´±" (er) was simplified from "渳", after that the name "Erhai" continues to this day. According to Bai scholar's research, the "Yeyu" in the Chinese name "Yeyuze" (''ze'' ³½means lake) is evolved from Bai language which means "lower wa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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