|
Radix (gastropod)
''Radix'' is a genus of air-breathing freshwater snails, aquatic pulmonate gastropods in the family Lymnaeidae, the pond snails.Bouchet, P.; Gofas, S. (2013). ''Radix'' Montfort, 1810. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=248262 on 2013-06-06 The genus ''Radix'' has a Palaearctic distribution. Phylogeny Correa et al. (2010) confirmed that the placement of these species within the genus ''Radix'' reflected their phylogenetic relationship. A cladogram showing phylogenic relations of species in the genus ''Radix'': The haploid number of chromosomes of all species in the genus ''Radix'' is 17 (n=17). Species The taxonomic status of certain species in the genus ''Radix'' has been disputed. Remigio (2002) reported sequence divergence within the 16S mitochondrial gene of '' Radix peregra'' and '' Radix ovata''. Furthermore, the shell morphology and alloenzyme data indicated that ''Radix peregra'' and '' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gastropod Shell
The gastropod shell is part of the body of a gastropod or snail, a kind of mollusc. The shell is an exoskeleton, which protects from predators, mechanical damage, and dehydration, but also serves for muscle attachment and calcium storage. Some gastropods appear shell-less (slugs) but may have a remnant within the mantle, or in some cases the shell is reduced such that the body cannot be retracted within it ( semi-slug). Some snails also possess an operculum that seals the opening of the shell, known as the aperture, which provides further protection. The study of mollusc shells is known as conchology. The biological study of gastropods, and other molluscs in general, is malacology. Shell morphology terms vary by species group. Shell layers The gastropod shell has three major layers secreted by the mantle. The calcareous central layer, tracum, is typically made of calcium carbonate precipitated into an organic matrix known as conchiolin. The outermost layer is the periostr ... [...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, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Haploid
Ploidy () is the number of complete sets of chromosomes in a cell, and hence the number of possible alleles for autosomal and pseudoautosomal genes. Sets of chromosomes refer to the number of maternal and paternal chromosome copies, respectively, in each homologous chromosome pair, which chromosomes naturally exist as. 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 chromosome sets. 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 organism's life cycle. Hal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radix Rubiginosa
''Radix rubiginosa'' is a species of air-breathing freshwater snail, an aquatic pulmonate gastropod in the family Lymnaeidae, the pond snails. This species is sometimes treated as a subspecies of ''Radix auricularia''. Distribution This species occurs in its native range in: * Indo-China * Indonesia * Vietnam - it was firstly identified in Vietnam in 2013 in southern Vietnam.Dung B. T., Doanh P. N., The D. T., Loan H. T., Losson B. & Caron Y. (2013). "Morphological and Molecular Characterization of Lymnaeid Snails and Their Potential Role in Transmission of ''Fasciola'' spp. in Vietnam". '' Korean Journal of Parasitology'' 51(6): 657-662. . It occurs as an introduced "hothouse alien" in: * Great Britain * Ireland Description The shape of the shell is elongated and cylindrical. The shell has 5 whorls. The aperture is moderately expanded. The width of the aperture is 4–5 mm. The height of the aperture is 7–11 mm. The width of the shell is 5–8 mm. The h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radix Quadrasi
In a positional numeral system, the radix or base is the number of unique digits, including the digit zero, used to represent numbers. For example, for the decimal/denary system (the most common system in use today) the radix (base number) is ten, because it uses the ten digits from 0 through 9. In any standard positional numeral system, a number is conventionally written as with ''x'' as the string of digits and ''y'' as its base, although for base ten the subscript is usually assumed (and omitted, together with the pair of parentheses), as it is the most common way to express value. For example, (the decimal system is implied in the latter) and represents the number one hundred, while (100)2 (in the binary system with base 2) represents the number four. Etymology ''Radix'' is a Latin word for "root". ''Root'' can be considered a synonym for ''base,'' in the arithmetical sense. In numeral systems In the system with radix 13, for example, a string of digits such as 398 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radix Luteola
''Radix luteola'' is a species of freshwater snail, an aquatic gastropod mollusc in the family Lymnaeidae. Placement of this species within the genus ''Radix'' was confirmed by Correa et al. (2010).Correa C. A., Escobar J. S., Durand P., Renaud F., David P., Jarne P., Pointier J.-P. & Hurtrez-Boussès S. (2010). "Bridging gaps in the molecular phylogeny of the Lymnaeidae (Gastropoda: Pulmonata), vectors of Fascioliasis". ''BMC Evolutionary Biology'' 10: 381. . There exist two forms of this species: * ''Radix luteola'' f. ''australis'' * ''Radix luteola'' f. ''ovalis'' Distribution ''Radix luteola'' is a widespread species in south Asia and southeast Asia. Parasites ''Radix luteola'' is the first intermediate host for the trematodes: * ''Schistosoma nasale'' * '' Schistosoma indicum''Liu L. et al. (2010) "The phylogeography of ''Indoplanorbis exustus'' (Gastropoda: Planorbidae) in Asia". ''Parasites & Vectors'' 3: 57. . * ''Schistosoma spindale'' * ''Schistosoma suis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radix Natalensis
''Radix natalensis'' is a species of freshwater snail, an aquatic gastropod mollusc in the family Lymnaeidae. This species occurs widely in Africa. It is a major intermediate host for '' Fasciola gigantica'' in Africa. Placement of this species in the genus ''Radix'' was confirmed by Correa et al. (2010). Distribution ''Radix natalensis'' is a widespread species in Africa, occurring from northern Africa to southern Africa: * Northern Africa: Algeria, Tunisia, Egypt, Sudan. There are also findings of distribution of ''Radix natalensis'' in Algeria 8–10,000 years ago. In Egypt it has been detected in water bodies of the Nile Delta. * Western Africa: Benin, Burkina Faso, Côte d'Ivoire, Gambia, Ghana, Guinea, Guinea-Bissau, Liberia, Mali, Niger, Nigeria and Senegal, Sarr A., Kinzelbach R. & Diouf M. (2011, in press). "Diversité spécifique et écologie des mollusques continenatux de la basse vallée du Ferlo (Sénégal). pecific diversity and ecology of continental mo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radix Ovata
''Radix balthica'', common name the wandering snail, is a species of air-breathing freshwater snail, an aquatic pulmonate gastropod mollusk in the family Lymnaeidae, the pond snails.Neubauer, Thomas A.; Rosenberg, G.; Gofas, S. (2014). Radix balthica (Linnaeus, 1758). In: MolluscaBase (2016). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=248264 on 2017-01-10 Taxonomy The taxonomic status of certain species in the genus ''Radix'' has been disputed. Remigio (2002) reported sequence divergence within the 16S mitochondrial gene of ''Radix peregra'' and '' Radix ovata''. Furthermore, the shell morphology and alloenzyme data indicated that ''Radix peregra'' and ''Radix ovata'' are distinct. In contrast, Bargues et al. (2001) considered on the basis of ITS-2 sequence analysis, that ''R. peregra'', ''R. ovata'', and ''R. balthica'' are in fact a conspecific species. Distribution All of eastern Europe to western Siber ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radix Lagotis
''Ampullaceana lagotis'' is a species of freshwater gastropods belonging to the family Lymnaeidae Lymnaeidae, common name the pond snails, is a taxonomic family of small to large air-breathing freshwater snails, aquatic pulmonate gastropod mollusks, that belong to the clade Hygrophila. Lymnaeidae is the only family within the superf .... The species is found in Eurasia. References Lymnaeidae Gastropods described in 1803 Freshwater snails Gastropods of Asia Gastropods of Europe {{Lymnaeidae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radix Ampla
''Ampullaceana ampla'' is a species of air-breathing freshwater snail, an aquatic pulmonate gastropod mollusc in the family Lymnaeidae, the pond snails.MolluscaBase (2019). MolluscaBase. Ampullaceana ampla (W. Hartmann, 1821). Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=1288030 on 2019-03-23 Distribution This species is found in European countries including: * Germany * Poland * Czech Republic Horsák M., Juřičková L., Beran L., Čejka T. & Dvořák L. (2010). "Komentovaný seznam měkkýšů zjištěných ve volné přírodě České a Slovenské republiky. nnotated list of mollusc species recorded outdoors in the Czech and Slovak Republics. ''Malacologica Bohemoslovaca'', Suppl. 1: 1-37PDF * Slovakia * and others in Central and Eastern Europe.Then across the Palearctic to Siberia Siberia ( ; rus, Сибирь, r=Sibir', p=sʲɪˈbʲirʲ, a=Ru-Сибирь.ogg) is an extensive region, geographical ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radix Peregra
''Peregriana peregra'' is a species of air-breathing freshwater snail, an aquatic pulmonate gastropod in the family Lymnaeidae, the pond snails. Distribution and habitat This small pond snail is found in Europe, Newfoundland and northern Asia. This species is common in slow-moving or still water.Janus Horst. (1965). ''The young specialist looks at land and freshwater molluscs''. Burke, London. References External links''Radix peregra'' at Animalbase AnimalBase is a project brought to life in 2004 and is maintained by the University of Göttingen, Germany. The goal of the AnimalBase project is to digitize early zoological literature, provide copyright-free open access to zoological works, and pr ... Lymnaeidae Gastropods described in 1774 Taxa named by Otto Friedrich Müller {{Lymnaeidae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radix Labiata
''Peregriana peregra'' is a species of air-breathing freshwater snail, an aquatic pulmonate gastropod in the family Lymnaeidae, the pond snails. Distribution and habitat This small pond snail is found in Europe, Newfoundland and northern Asia. This species is common in slow-moving or still water.Janus Horst. (1965). ''The young specialist looks at land and freshwater molluscs''. Burke, London. References External links''Radix peregra'' at Animalbase AnimalBase is a project brought to life in 2004 and is maintained by the University of Göttingen, Germany. The goal of the AnimalBase project is to digitize early zoological literature, provide copyright-free open access to zoological works, and pr ... Lymnaeidae Gastropods described in 1774 Taxa named by Otto Friedrich Müller {{Lymnaeidae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
