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Valvata Piscinalis
''Valvata piscinalis'', common name the European stream valvata or European valve snail, is a species of minute freshwater snail with gills and an Operculum (gastropod), operculum, an Aquatic animal, aquatic gastropod mollusk in the family Valvatidae, the valve snails. It is also known as ''Cincinna piscinalis'' (Müller, 1774). Subspecies Subspecies of ''Valvata piscinalis'' include:Glöer, P. 2002 ''Die Süßwassergastropoden Nord- und Mitteleuropas''. Die Tierwelt Deutschlands, ConchBooks, Hackenheim, 326 pp., , page 190-194. * ''Valvata piscinalis piscinalis'' (O. F. Müller, 1774) * ''Valvata piscinalis antiqua'' (Morris, 1838) * ''Valvata piscinalis geyeri'' (Menzel, 1904) - The name ''geyeri'' is in honor of German zoologist David Geyer (1855–1932). * ''Valvata piscinalis discors'' (Westerlund, 1886) * ''Valvata piscinalis alpestris'' (Küster, 1853) Shell description ''Valvata piscinalis'' has a somewhat pinched Aperture (mollusc), aperture and an attenuate Spire ( ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Animal
Animals are multicellular, eukaryotic organisms in the Kingdom (biology), biological kingdom Animalia. With few exceptions, animals Heterotroph, consume organic material, Cellular respiration#Aerobic respiration, breathe oxygen, are Motility, able to move, can Sexual reproduction, reproduce sexually, and go through an ontogenetic stage in which their body consists of a hollow sphere of Cell (biology), cells, the blastula, during Embryogenesis, embryonic development. Over 1.5 million Extant taxon, living animal species have been Species description, described—of which around 1 million are Insecta, insects—but it has been estimated there are over 7 million animal species in total. Animals range in length from to . They have Ecology, complex interactions with each other and their environments, forming intricate food webs. The scientific study of animals is known as zoology. Most living animal species are in Bilateria, a clade whose members have a Symmetry in biology#Bilate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mollusk
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 gas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Great Lakes
The Great Lakes, also called the Great Lakes of North America, are a series of large interconnected freshwater lakes in the mid-east region of North America that connect to the Atlantic Ocean via the Saint Lawrence River. There are five lakes, which are Lake Superior, Superior, Lake Michigan, Michigan, Lake Huron, Huron, Lake Erie, Erie, and Lake Ontario, Ontario and are in general on or near the Canada–United States border. Hydrologically, lakes Lake Michigan–Huron, Michigan and Huron are a single body joined at the Straits of Mackinac. The Great Lakes Waterway enables modern travel and shipping by water among the lakes. The Great Lakes are the largest group of freshwater lakes on Earth by total area and are second-largest by total volume, containing 21% of the world's surface fresh water by volume. The total surface is , and the total volume (measured at the low water datum) is , slightly less than the volume of Lake Baikal (, 22–23% of the world's surface fresh water ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Valvata Sincera
''Valvata sincera'', common name the mossy valvata is a species of small freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Valvatidae ''Valvatidae'', the valve snails, is a taxonomic family of very small freshwater snails with an operculum, aquatic gastropod mollusks. Taxonomy The family Valvatidae has no subfamilies (according to the taxonomy of the Gastropoda by Bouche ..., the valve snails. References * Turgeon, D.D., et al. 1998. ''Common and scientific names of aquatic invertebrates of the United States and Canada''. American Fisheries Society Special Publication 26 Further reading Boreal Turret Snail, ''Valvata sincera'' Natural Heritage & Endangered Species Program. 2 pp. Valvatidae Gastropods described in 1824 {{Valvatidae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Valvata Piscinalis Drawing
''Valvata'' is a genus of very small freshwater snails with an operculum, aquatic gastropod mollusks in the family Valvatidae, the valve snails.Bouchet, P.; Rosenberg, G. (2014). Valvata O. F. Müller, 1774. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=153994 on 2014-11-15 Synonyms * ''Cincinna'' Hübner, 1810 · accepted, alternate representation (''Cincinna'' is treated as subgenus of ''Valvata'') * ''Cincinna (Atropidina)'' Lindholm, 1906 (subgenus-genus combination invalid; ''Atropidina'' is considered a junior synonym of ''Tropidina'' or ''Cincinna'' (depending on source); to avoid problems we refer to ''Valvata'' only) * ''Cincinna (Cincinna)'' Hübner, 1810 (''Cincinna'' is treated as subgenus of ''Valvata'') * ''Gyrorbis'' Fitzinger, 1833 (junior synonym (?)) * ''Planorbis (Gyrorbis)'' Fitzinger, 1833 (junior synonym (?)) * ''Valvata (Atropidina)'' Lindholm, 1906 (type species of ''Atropidina'' (Valvata pulc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Valvata Piscinalis 01
''Valvata'' is a genus of very small freshwater snails with an operculum, aquatic gastropod mollusks in the family Valvatidae, the valve snails.Bouchet, P.; Rosenberg, G. (2014). Valvata O. F. Müller, 1774. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=153994 on 2014-11-15 Synonyms * ''Cincinna'' Hübner, 1810 · accepted, alternate representation (''Cincinna'' is treated as subgenus of ''Valvata'') * ''Cincinna (Atropidina)'' Lindholm, 1906 (subgenus-genus combination invalid; ''Atropidina'' is considered a junior synonym of ''Tropidina'' or ''Cincinna'' (depending on source); to avoid problems we refer to ''Valvata'' only) * ''Cincinna (Cincinna)'' Hübner, 1810 (''Cincinna'' is treated as subgenus of ''Valvata'') * ''Gyrorbis'' Fitzinger, 1833 (junior synonym (?)) * ''Planorbis (Gyrorbis)'' Fitzinger, 1833 (junior synonym (?)) * ''Valvata (Atropidina)'' Lindholm, 1906 (type species of ''Atropidina'' (Valvata pulc ... [...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] |
Eutrophic
Eutrophication is the process by which an entire body of water, or parts of it, becomes progressively enriched with minerals and nutrients, particularly nitrogen and phosphorus. It has also been defined as "nutrient-induced increase in phytoplankton productivity". Water bodies with very low nutrient levels are termed oligotrophic and those with moderate nutrient levels are termed mesotrophic. Advanced eutrophication may also be referred to as dystrophic and hypertrophic conditions. Eutrophication can affect freshwater or salt water systems. In freshwater ecosystems it is almost always caused by excess phosphorus. In coastal waters on the other hand, the main contributing nutrient is more likely to be nitrogen, or nitrogen and phosphorus together. This depends on the location and other factors. When occurring naturally, eutrophication is a very slow process in which nutrients, especially phosphorus compounds and organic matter, accumulate in water bodies. These nutrients derive f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spire (mollusc)
A spire is a part of the coiled shell of molluscs. The spire consists of all of the whorls except for the body whorl. Each spire whorl represents a rotation of 360°. A spire is part of the shell of a snail, a gastropod mollusc, a gastropod shell, and also the whorls of the shell in ammonites, which are fossil shelled cephalopods. In textbook illustrations of gastropod shells, the tradition (with a few exceptions) is to show most shells with the spire uppermost on the page. The spire, when it is not damaged or eroded, includes the protoconch (also called the nuclear whorls or the larval shell), and most of the subsequent teleoconch whorls (also called the postnuclear whorls), which gradually increase in area as they are formed. Thus the spire in most gastropods is pointed, the tip being known as the "apex". The word "spire" is used, in an analogy to a church spire or rock spire, a high, thin, pinnacle. The "spire angle" is the angle, as seen from the apex, at which a spire ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aperture (mollusc)
The aperture is an opening in certain kinds of mollusc shells: it is the main opening of the shell, where the head-foot part of the body of the animal emerges for locomotion, feeding, etc. The term ''aperture'' is used for the main opening in gastropod shells, scaphopod shells, and also for ''Nautilus'' and ammonite shells. The word is not used to describe bivalve shells, where a natural opening between the two shell valves in the closed position is usually called a ''gape''. Scaphopod shells are tubular, and thus they have two openings: a main anterior aperture and a smaller posterior aperture. As well as the aperture, some gastropod shells have additional openings in their shells for respiration; this is the case in some Fissurellidae (keyhole limpets) where the central smaller opening at the apex of the shell is called an orifice, and in the Haliotidae (abalones) where the row of respiratory openings in the shell are also called orifices. In gastropods In some prosobranch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Valvata Piscinalis Alpestris
''Valvata'' is a genus of very small freshwater snails with an operculum, aquatic gastropod mollusks in the family Valvatidae, the valve snails.Bouchet, P.; Rosenberg, G. (2014). Valvata O. F. Müller, 1774. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=153994 on 2014-11-15 Synonyms * ''Cincinna'' Hübner, 1810 · accepted, alternate representation (''Cincinna'' is treated as subgenus of ''Valvata'') * ''Cincinna (Atropidina)'' Lindholm, 1906 (subgenus-genus combination invalid; ''Atropidina'' is considered a junior synonym of ''Tropidina'' or ''Cincinna'' (depending on source); to avoid problems we refer to ''Valvata'' only) * ''Cincinna (Cincinna)'' Hübner, 1810 (''Cincinna'' is treated as subgenus of ''Valvata'') * ''Gyrorbis'' Fitzinger, 1833 (junior synonym (?)) * ''Planorbis (Gyrorbis)'' Fitzinger, 1833 (junior synonym (?)) * ''Valvata (Atropidina)'' Lindholm, 1906 (type species of ''Atropidina'' (Valvata pulc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Valvata Piscinalis Discors
''Valvata'' is a genus of very small freshwater snails with an operculum, aquatic gastropod mollusks in the family Valvatidae, the valve snails.Bouchet, P.; Rosenberg, G. (2014). Valvata O. F. Müller, 1774. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=153994 on 2014-11-15 Synonyms * ''Cincinna'' Hübner, 1810 · accepted, alternate representation (''Cincinna'' is treated as subgenus of ''Valvata'') * ''Cincinna (Atropidina)'' Lindholm, 1906 (subgenus-genus combination invalid; ''Atropidina'' is considered a junior synonym of ''Tropidina'' or ''Cincinna'' (depending on source); to avoid problems we refer to ''Valvata'' only) * ''Cincinna (Cincinna)'' Hübner, 1810 (''Cincinna'' is treated as subgenus of ''Valvata'') * ''Gyrorbis'' Fitzinger, 1833 (junior synonym (?)) * ''Planorbis (Gyrorbis)'' Fitzinger, 1833 (junior synonym (?)) * ''Valvata (Atropidina)'' Lindholm, 1906 (type species of ''Atropidina'' (Valvata pulc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
