Sphaerium
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Sphaerium
''Sphaerium'' is a genus of very small freshwater clams, aquatic bivalve molluscs in the family Sphaeriidae, known as the fingernail clams. The small clams in this genus are unusual in that many of them, such as ''Sphaerium corneum'', can climb around underwater on aquatic plants, using their long and strong foot. Selected species The following species are included in the genus ''Sphaerium'': *'' Sphaerium asiaticum'' *†'' Sphaerium beckmani'' *'' Sphaerium bequaerti'' *''Sphaerium corneum ''Sphaerium corneum'', also known as the European fingernailclam, is a very small freshwater clam, an aquatic bivalve mollusk in the family Sphaeriidae, the fingernail clams. Description The shell is fairly globular and can grow up to 9–13.5& ...'' – European fingernail clam *'' Sphaerium lacustre'' *'' Sphaerium nitidum'' – Arctic fingernail clam *'' Sphaerium novaezelandiae'' *'' Sphaerium nucleus'' *'' Sphaerium ovale'' *'' Sphaerium rhomboideum'' *'' Sphaerium rivi ...
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Sphaerium Nucleus
''Sphaerium nucleus'' is a freshwater bivalve of the family Sphaeriidae. It has been often confused with ''Sphaerium corneum'' and is consequently quite poorly known. Description ''Sphaerium nucleus'' is a very small bivalve which may grow up to 8mm in width and length. It differs from ''Sphaerium corneum'' only in details. Like almost all bivalves, it is a filter-feeder. Taxonomy ''Sphaerium nucleus'' was described by Studer 1820, who placed it in the genus ''Cyclas''. It was later thought to be a subspecies of ''Sphaerium corneum''. Subsequently it was raised to a full species again as ''Sphaerium nucleus'' (Studer, 1820) due to its having a different form of kidney, and the shell having a broad hinge plate, dense porosity and more tumid shells with broad umbones. Unlike ''S. corneum'' it has a preference for temporary habitats. Distribution ''S. nucleus'' occurs widely in Europe, from Spain to Ukraine. It appears to be absent from Russia. * Austria * Britain and Ireland (b ...
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Sphaerium Corneum
''Sphaerium corneum'', also known as the European fingernailclam, is a very small freshwater clam, an aquatic bivalve mollusk in the family Sphaeriidae, the fingernail clams. Description The shell is fairly globular and can grow up to 9–13.5 mm in size. The color of the shell is usually a brown to gray with the juveniles being a yellow color. Their shells exhibit striae, thin parallel rows of elevated lines. Revisiondate: 3/23/2007 Ecology These small clams are found in shallow, freshwater habitats with slow moving waters, including freshwater lakes, rivers and creeks. As with most bivalves, ''Sphaerium corneum'' is mainly a filter feeder and thus prefers more eutrophic waters that provide a greater food source. These clams have exhibited a unique ability to climb up plants and structures around their habitat to find more optimal locations for feeding. They also are known to deposit feed in times of low current or food availability. This species has shown a preference ...
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Sphaerium Lacustre
''Sphaerium lacustre'', also known as lake fingernail clam, is species of small freshwater clam, an aquatic animal, aquatic bivalve mollusc in the family Sphaeriidae, the fingernail clams and pea clams. Description The 8–11 mm. shell is oval to quadrangular in shape. The umbos which are capped by the juvenile shell are slightly in front of middle directed forwards. The posterior end is broad and truncated. The shell is fragile, fairly glossy and pearl grey to white in colour. The periostracum (surface) is ornamented with fine, even, concentric striation. Distribution The native distribution of this species is Holarctic and occurs in islands and countries including: * List of non-marine molluscs of Algeria, Algeria * Belgium * List of non-marine molluscs of the Czech Republic, Czech Republic – in Bohemia, in Moravia, Horsák M., Juřičková L., Beran L., Čejka T. & Dvořák L. (2010). "Komentovaný seznam měkkýšů zjištěných ve volné přírodě České a Slovensk ...
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Sphaerium Solidum
''Sphaerium solidum'', the solid orb mussel, is a species of freshwater bivalve from family Sphaeriidae. Distribution and conservation status * Listed in IUCN Red List The International Union for Conservation of Nature (IUCN) Red List of Threatened Species, also known as the IUCN Red List or Red Data Book, founded in 1964, is an inventory of the global conservation status and extinction risk of biological ... – Assessed in 2012 as NT (near threatened) * Germany – critically endangered (''vom Aussterben bedroht'') * Poland – endangered (EN) * Slovakia References Sources * solidum Bivalves described in 1844 {{Sphaeriidae-stub ...
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Sphaerium Rhomboideum
''Sphaerium rhomboideum'', the rhomboid fingernailclam, is a species of freshwater clams in the family Sphaeriidae Sphaeriidae is a family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, .... It is found in North America. References External links * ''Sphaerium rhomboideum''at mussel-project.uwsp.edu rhomboideum Bivalves described in 1822 {{Sphaeriidae-stub ...
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Sphaerium Asiaticum
''Sphaerium asiaticum'' is a species of bivalve belonging to the family Sphaeriidae. Per IUCN The International Union for Conservation of Nature (IUCN) is an international organization working in the field of nature conservation and sustainable use of natural resources. Founded in 1948, IUCN has become the global authority on the status ..., the species has the status "least concern". References asiaticum {{Sphaeriidae-stub ...
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Sphaerium Beckmani
''Sphaerium beckmani'' is an extinct species of fossil freshwater pea clams from the Late Cretaceous deposits of North America. This species was first described by the American paleontologist Loris Shano Russell in 1976. The specimens were collected by the American paleontologist Karl M. Waage from 1961 to 1962 from the Hell Creek Formation of eastern Montana. The locality is dated to the late Maastrichtian Age (around 66.0 to 72.1 million years ago Million years ago, abbreviated as Mya, Myr (megayear) or Ma (megaannum), is a unit of time equal to (i.e. years), or approximately 31.6 teraseconds. Usage Myr is in common use in fields such as Earth science and cosmology. Myr is also used w ...). References beckmani Cretaceous bivalves Late Cretaceous animals of North America Cretaceous United States Maastrichtian life Hell Creek fauna Fossil taxa described in 1976 {{Sphaeriidae-stub ...
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Sphaerium Transversum
''Sphaerium transversum'' is a species of freshwater bivalve from the family Sphaeriidae. Distribution and conservation status * Not listed in IUCN red list The International Union for Conservation of Nature (IUCN) Red List of Threatened Species, also known as the IUCN Red List or Red Data Book, founded in 1964, is an inventory of the global conservation status and extinction risk of biological ... – not evaluated (NE) * GermanyGlöer P. & Meier-Brook C. (2003) Süsswassermollusken. DJN, pp. 134, page 82, References Sphaeriidae Bivalves described in 1829 {{Sphaeriidae-stub ...
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Sphaerium Stuhlmanni
''Sphaerium stuhlmanni'' is a species of freshwater bivalve in the family Sphaeriidae. It is endemic to Lake Victoria in Kenya, Tanzania and Uganda Uganda, officially the Republic of Uganda, is a landlocked country in East Africa. It is bordered to the east by Kenya, to the north by South Sudan, to the west by the Democratic Republic of the Congo, to the south-west by Rwanda, and to the .... It occurs on muddy and sandy bottoms, typically in shallow waters (0–10 m depth) but potentially down to 50 m depth. References stuhlmanni Freshwater animals of Africa Molluscs of Africa Molluscs of Kenya Molluscs of Tanzania Invertebrates of Uganda Freshwater bivalves Molluscs described in 1897 Taxa named by Eduard von Martens Taxonomy articles created by Polbot {{Sphaeriidae-stub ...
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Sphaeriidae
Sphaeriidae is a family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ... of small to minute freshwater bivalve molluscs in the order (biology), order Sphaeriida. In the US, they are commonly known as pea clams or fingernail clams.William H. Heard (biologist), Heard, William H. 1977. Reproduction of fingernail clams (Sphaeriidae: ''Sphaerium'' and ''Musculium''). Malacologia, 16: 421-455. The Sphaeriidae is actually an important group of freshwater invertebrates, seeing as they play a huge role in the energy flow and the nutrient cycling within aquatic ecosystems, in which they constitute a food item for organisms of higher trophic levels and even contribute to the bioturbation of sediments which can help create a physical resource for many other species that utilize the shells. ...
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