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Theodoxus
''Theodoxus'' is a genus of nerites, small water snails with an operculum, some of which live in freshwater, and some in both freshwater and brackish water, aquatic gastropod mollusks in the family Neritidae, the nerites.Bouchet, P. (2014). Theodoxus Montfort, 1810. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=153531 on 2014-11-17. Distribution The distribution of the genus ''Theodoxus'' includes Europe and northern Africa and also extends east to southern Iran. No other species within Neritidae have sympatrical distribution with ''Theodoxus''. The distribution of the genus ''Theodoxus'' is an exception within Neritidae, because Neritidae live primarily in the southern hemisphere. Species within ''Theodoxus'' are the only Neritidae snails, that live in temperate climate. Bunje & Lindberg (2007) presented the first phylogenetic hypothesis of the clade ''Theodoxus''.Bunje P. M. & Lindberg D. R. (2007). "Lineage dive ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Theodoxus Amblygonioides
''Theodoxus'' is a genus of nerites, small water snails with an operculum, some of which live in freshwater, and some in both freshwater and brackish water, aquatic gastropod mollusks in the family Neritidae, the nerites.Bouchet, P. (2014). Theodoxus Montfort, 1810. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=153531 on 2014-11-17. Distribution The distribution of the genus ''Theodoxus'' includes Europe and northern Africa and also extends east to southern Iran. No other species within Neritidae have sympatrical distribution with ''Theodoxus''. The distribution of the genus ''Theodoxus'' is an exception within Neritidae, because Neritidae live primarily in the southern hemisphere. Species within ''Theodoxus'' are the only Neritidae snails, that live in temperate climate. Bunje & Lindberg (2007) presented the first phylogenetic hypothesis of the clade ''Theodoxus''.Bunje P. M. & Lindberg D. R. (2007). "Lineage div ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Theodoxus Fluviatilis Radula
''Theodoxus'' is a genus of nerites, small water snails with an operculum, some of which live in freshwater, and some in both freshwater and brackish water, aquatic gastropod mollusks in the family Neritidae, the nerites.Bouchet, P. (2014). Theodoxus Montfort, 1810. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=153531 on 2014-11-17. Distribution The distribution of the genus ''Theodoxus'' includes Europe and northern Africa and also extends east to southern Iran. No other species within Neritidae have sympatrical distribution with ''Theodoxus''. The distribution of the genus ''Theodoxus'' is an exception within Neritidae, because Neritidae live primarily in the southern hemisphere. Species within ''Theodoxus'' are the only Neritidae snails, that live in temperate climate. Bunje & Lindberg (2007) presented the first phylogenetic hypothesis of the clade ''Theodoxus''.Bunje P. M. & Lindberg D. R. (2007). "Lineage div ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Theodoxus Acuticarinatus
''Theodoxus'' is a genus of nerites, small water snails with an operculum, some of which live in freshwater, and some in both freshwater and brackish water, aquatic gastropod mollusks in the family Neritidae, the nerites.Bouchet, P. (2014). Theodoxus Montfort, 1810. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=153531 on 2014-11-17. Distribution The distribution of the genus ''Theodoxus'' includes Europe and northern Africa and also extends east to southern Iran. No other species within Neritidae have sympatrical distribution with ''Theodoxus''. The distribution of the genus ''Theodoxus'' is an exception within Neritidae, because Neritidae live primarily in the southern hemisphere. Species within ''Theodoxus'' are the only Neritidae snails, that live in temperate climate. Bunje & Lindberg (2007) presented the first phylogenetic hypothesis of the clade ''Theodoxus''.Bunje P. M. & Lindberg D. R. (2007). "Lineage div ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Theodoxus Petasatus
''Theodoxus'' is a genus of nerites, small water snails with an operculum, some of which live in freshwater, and some in both freshwater and brackish water, aquatic gastropod mollusks in the family Neritidae, the nerites.Bouchet, P. (2014). Theodoxus Montfort, 1810. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=153531 on 2014-11-17. Distribution The distribution of the genus ''Theodoxus'' includes Europe and northern Africa and also extends east to southern Iran. No other species within Neritidae have sympatrical distribution with ''Theodoxus''. The distribution of the genus ''Theodoxus'' is an exception within Neritidae, because Neritidae live primarily in the southern hemisphere. Species within ''Theodoxus'' are the only Neritidae snails, that live in temperate climate. Bunje & Lindberg (2007) presented the first phylogenetic hypothesis of the clade ''Theodoxus''.Bunje P. M. & Lindberg D. R. (2007). "Lineage div ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Theodoxus Fluviatilis
''Theodoxus fluviatilis'', common name the river nerite, is a species of small freshwater and brackish water snail with a gill and an operculum, an aquatic gastropod mollusk in the family Neritidae, the nerites.Neubauer, Thomas A. (2014). ''Theodoxus'' (''Theodoxus'') ''fluviatilis'' (Linnaeus, 1758). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=821986 on 2014-11-18 This widely distributed neritid snail species occurs from Europe to Central Asia. It has a thick shell with a calcified operculum. The coloration pattern on the shell is very variable. ''Theodoxus fluviatilis'' lives in freshwater and in brackish water, in rivers and lakes on stones. It feeds mainly by grazing on biofilms and diatoms. Some of the populations of this species are spreading, and these can reach densities up to thousands of snails per square meter. Females lay egg capsules, each of which contains a large number of eggs, but only one snai ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neritidae
Neritidae, common name the nerites, is a taxonomic family of small to medium-sized saltwater and freshwater snails which have a gill and a distinctive operculum. MolluscaBase eds. (2021). MolluscaBase. Neritininae Poey, 1852. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=411639 on 2021-09-25 The family Neritidae includes marine genera such as ''Nerita'', marine and freshwater genera such as ''Neritina'', and freshwater and brackish water genera such as ''Theodoxus''. The common name "nerite" as well as the family name Neritidae and the genus name ''Nerita'', are derived from the name of Nerites, who was a sea god in Greek mythology. Distribution Neritidae live primarily in the southern hemisphere, but there are some exceptions, such as a genus ''Theodoxus'' which can be found in Europe and Northern Africa Bunje P. M. & Lindberg D. R. (2007). "Lineage divergence of a freshwater snail clade associated with post- ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Non-marine Molluscs Of Iran
The non-marine molluscs of Iran are a part of the molluscan fauna of Iran, which is part of the (wildlife of Iran). Freshwater gastropods 27 freshwater gastropod species (37% of freshwater gastropod species in Iran) are endemic to Iran. Species of freshwater gastropods of Iran include: Neritidae * '' Neritina mesopotamica'' Martens 1879 - the first report in Iran was in 2001Mansoorian A. (2001). "Freshwater Gastropod of Khuzestan Province, South-West Iran". ''Iranian Int. J. Sci.'' 2(2): 9 ppPDF * '' Neritina cinctellus'' (Martens, 1874) * '' Neritina euphratica'' Mousson, 1874 * ''Theodoxus jordani'' (Sowerby I, 1836) * '' Theodoxus major'' Issel, 1865 - mentioned by Glöer & Pešić (2012) as '' Theodoxus lituratus'' (Eichwald, 1838) * ''Theodoxus pallidus'' Dunker, 1861 Viviparidae * ''Bellamya bengalensis'' (Lamarck, 1822) * ''Bellamya hilmandensis'' (Kobelt, 1909) Melanopsidae * '' Melanopsis costata'' (Olivier, 1804) * ''Melanopsis doriae'' Issel, 1865 * ''Melanopsis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gastropod Shell
The gastropod shell is part of the body of a Gastropoda, 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 (mollusc), 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 (mollusc), mantle. The calcareous central layer, tracum, is typically made of calcium carbonate precipitated into an organic matrix known as c ... [...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] |
Whorl (mollusc)
A whorl is a single, complete 360° revolution or turn in the spiral growth of a mollusc shell. A spiral configuration of the shell is found in numerous gastropods, but it is also found in shelled cephalopods including ''Nautilus'', ''Spirula'' and the large extinct subclass of cephalopods known as the ammonites. A spiral shell can be visualized as consisting of a long conical tube, the growth of which is coiled into an overall helical or planispiral shape, for reasons of both strength and compactness. The number of whorls which exist in an adult shell of a particular species depends on mathematical factors in the geometric growth, as described in D'Arcy Wentworth Thompson's classic 1917 book ''On Growth and Form'', and by David Raup. The main factor is how rapidly the conical tube expands (or flares-out) over time. When the rate of expansion is low, such that each subsequent whorl is not that much wider than the previous one, then the adult shell has numerous whorls. When the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus comes above species and below family (taxonomy), family. In binomial nomenclature, the genus name forms the first part of the binomial species name for each species within the genus. :E.g. ''Panthera leo'' (lion) and ''Panthera onca'' (jaguar) are two species within the genus ''Panthera''. ''Panthera'' is a genus within the family Felidae. The composition of a genus is determined by taxonomy (biology), taxonomists. The standards for genus classification are not strictly codified, so different authorities often produce different classifications for genera. There are some general practices used, however, including the idea that a newly defined genus should fulfill these three criteria to be descriptively useful: # monophyly – all descendants ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Snail
A snail is, in loose terms, a shelled gastropod. The name is most often applied to land snails, terrestrial pulmonate gastropod molluscs. However, the common name ''snail'' is also used for most of the members of the molluscan class Gastropoda that have a coiled shell that is large enough for the animal to retract completely into. When the word "snail" is used in this most general sense, it includes not just land snails but also numerous species of sea snails and freshwater snails. Gastropods that naturally lack a shell, or have only an internal shell, are mostly called '' slugs'', and land snails that have only a very small shell (that they cannot retract into) are often called ''semi-slugs''. Snails have considerable human relevance, including as food items, as pests, and as vectors of disease, and their shells are used as decorative objects and are incorporated into jewelry. The snail has also had some cultural significance, tending to be associated with lethargy. The sn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
