|
Pisidium
''Pisidium'' is a genus of very small or minute freshwater clams known as pill clams or pea clams, aquatic bivalve molluscs in the family Sphaeriidae, the pea clams and fingernail clams. In some bivalve classification systems, the family Sphaeriidae is referred to as Pisidiidae, and occasionally ''Pisidium'' species are grouped in a subfamily known as Pisidiinae. ''Pisidium'' and taphonomy In large enough quantities, the minute shells of these bivalves can affect environmental conditions, and this change in conditions can positively affect the ability of organic remains in the immediate environment to fossilize (one aspect of taphonomy). For example, in the Dinosaur Park Formation, the fossil remains of hadrosaur eggshells are rare. This is because the breakdown of tannins from the local coniferous vegetation caused the ancient waters to be acidic, and therefore usually eggshell fragments dissolved in the water before they had a chance to be fossilized. Hadrosaur eggshell ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pisidium Moitessierianum
''Pisidium moitessierianum'' is a species of minute freshwater clam. It is an aquatic bivalve mollusc in the family Sphaeriidae. Description This species is the smallest of the pea clams or ''Pisidium'' species, and the smallest of any freshwater bivalve, at 1.5 - 2.5 mm. adult size. The shell is long-oval and oblique wedge-shaped with prominent umbos which are slightly behind the midpoint. The umbos are demarcated by a shallow furrow. The surface (periostracum) is silky, with regular concentric striae. Distribution The species is native to Europe but has been introduced to northeastern North America. * 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 Slovenské republiky. nnotated list of mollusc species recorded outdoors in the Czech and Slovak Republics. ''Malacologica Bohemoslovaca'', Suppl. 1: 1-37PDF - endangered (EN) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pisidium Casertanum
''Pisidium casertanum'', the pea cockle or pea clam, is a minute freshwater bivalve mollusc of the family Sphaeriidae. Description The shell is broad, sub-triangular or oval and is ornamented with sculpture of faint concentric striations. The umbos are slightly behind the middle. The Periostracum is silky, scarcely glossy. In colour it is whitish to grey-brown and often the shell is coated with reddish-brown deposits. The shell is of similar shape to ''Sphaerium novaezelandiae'' but is smaller as an adult, more inflated, with a deeper hinge-plate, stronger teeth, and the ligament is not visible externally. Length is up to 4.5 mm, height 3.7 mm, and thickness 2.3 mm. Distribution It has a cosmopolitan distribution and is perhaps the world's widely distributed non-marine mollusc. * British Isles - common *Ireland * Czech Republic - in Bohemia, in Moravia, Horsák M., Juřičková L., Beran L., Čejka T. & Dvořák L. (2010). "Komentovaný seznam měkký� ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pisidium Hibernicum
''Pisidium hibernicum'' is a species of freshwater bivalve from the family Sphaeriidae. Description The 2.5-3.5mm. shell is very inflated (convex) hence the common name Globular Pea Shell. The central umbos is prominent. The periostracum (surface) is silky glossy and sculptured by fine, regular striae. In colour it is greyish to brownish white often with scattered red-brown mineral deposits. Distribution Its native distribution is Palearctic. * Czech Republic – endangered (EN), endangered in Bohemia (EN), critically endangered in Moravia 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 * Germany – endangered (''gefährdet'') * Nordic countries: Denmark, Faroes, Finland, Iceland, Norway and Sweden *Great Brit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pisidium Pseudosphaerium
''Pisidium pseudosphaerium'' is a species of freshwater bivalve from family Sphaeriidae. Description The 2.5-3.2mm shell is a flattened, regular, slightly angulated oval shape with low central umbos. The surface is silky with very fine concentric striations. In colour it is straw-yellow with scattered red-brown deposits. Distribution Its native distribution is central European and western European. * 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 Slovenské republiky. nnotated list of mollusc species recorded outdoors in the Czech and Slovak Republics. ''Malacologica Bohemoslovaca'', Suppl. 1: 1-37PDF critically endangered (CR) * Germany - critically endangered (''vom Aussterben bedroht'') * Nordic countries The Nordic countries (also known as the Nordics or ''Norden''; literal translation, lit. 'the North') are a geographic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pisidium Lilljeborgii
''Pisidium lilljeborgii'' is a species of freshwater bivalve from the family Sphaeriidae. Description A moderately swollen (tumid), trapezoidal shell. The umbos are just behind the mid point and described as fairly narrow. The surface (periostracum) is slightly glossy and has coarse, irregular concentric striae. The colour is grey to brownish white. Pisidium lilljeborgii has a less equilateral shape than ''Pisidium hibernicum'' 3-4.5mm. Distribution and conservation status * Not listed in IUCN red list – not evaluated (NE) * Germany – high endangered (''Stark gefährdet'') * Nordic countries: Denmark, Faroes, Finland, Iceland, Norway and Sweden *Great Britain and Ireland Ireland ( ; ga, Éire ; Ulster Scots dialect, Ulster-Scots: ) is an island in the Atlantic Ocean, North Atlantic Ocean, in Northwestern Europe, north-western Europe. It is separated from Great Britain to its east by the North Channel (Grea ...Roy Anderson ,2005 An annotated list of the non-marine m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pisidium Dilatatum
''Pisidium dilatatum'' is a species of freshwater bivalve belonging to the family Sphaeriidae. It is widespread in Europe and Asia, from southern Sweden in the west to Lake Baikal in the east. It occurs in oligotrophic An oligotroph is an organism that can live in an environment that offers very low levels of nutrients. They may be contrasted with copiotrophs, which prefer nutritionally rich environments. Oligotrophs are characterized by slow growth, low rates of ... lakes. References Sphaeriidae Molluscs of Asia Molluscs of Europe Freshwater animals of Asia Freshwater animals of Europe Molluscs described in 1897 {{bivalve-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pisidium Amnicum
''Pisidium amnicum'' is a species of very small freshwater clam, sometimes known as the greater European peaclam or the River pea shell. It is an aquatic bivalve in the family Sphaeriidae. Description Although only 9 mm (range 7–11 mm) in length, this species is considerably larger than most ''Pisidium'' species, and has a fairly thick, concentrically ridged shell. Its shell is solid, glossy, triangular-oval in shape, and has broad but not prominent umbos often coated with a dull ferruginous deposit. Its colour is grey-white to brown, often with a greenish cast. Distribution Its native distribution is Palearctic. The species has been introduced to northeastern North America. * Czech Republic – endangered (EN), endangered in Bohemia (EN), critically endangered in Moravia 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pisidium Obtusale
''Pisidium obtusale'' is a species of freshwater bivalve from family Sphaeriidae. Description The 2.5–3.5mm. shell is very tumid (swollen). It is an angular-oval shape with broad, rounded umbos which are behind the midpoint. The surface (periostracum) is glossy with fine concentric striae. Numerous pores are visible inside the shell. The colour is whitish to yellowish often coated with a red-brown deposit. Distribution Its native distribution is Holarctic. * 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 Slovenské republiky. nnotated list of mollusc species recorded outdoors in the Czech and Slovak Republics. ''Malacologica Bohemoslovaca'', Suppl. 1: 1-37PDF near threatened (NT) * Germany – (''Arten der Vorwarnliste'') * Nordic countries: Denmark, Faroes, Finland, Iceland, Norway and Sweden * Great Britain and IrelandRoy Anderso ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pisidium Henslowanum
''Pisidium henslowanum'' is a species of very small freshwater clam or pea clam, an aquatic bivalve mollusc in the family Sphaeriidae. It is commonly referred to as the Henslow peaclam. Etymology The specific name honours John Stevens Henslow. Description The shell is obliquely oval. It has prominent, narrow umbos well behind the middle and the umbos have oblique raised crests. The surface (periostracum) is silky with fine, even concentric striae. The colour is greyish, especially at the umbos. Widespread but local and uncommon. The size is 3.5-5mm. Distribution Its native distribution is Holarctic. * 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 Slovenské republiky. nnotated list of mollusc species recorded outdoors in the Czech and Slovak Republics. '' Malacologica Bohemoslovaca'', Suppl. 1: 1-37PDF least concern (LC) * S ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pisidium Personatum
''Pisidium personatum'' is a species of freshwater bivalve from the family Sphaeriidae. Description The 2.5-3.5 mm shell is a characteristic round-regular oval shape. It has centrally placed low, rounded umbos. The surface (periostracum) is dull or silky with very fine irregular concentric striations. The colour is yellowish to greyish but it is invariably coated in a red-brown to dark brown deposit. Distribution Its native distribution is European-Siberian. * 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 Slovenské republiky. nnotated list of mollusc species recorded outdoors in the Czech and Slovak Republics. ''Malacologica Bohemoslovaca'', Suppl. 1: 1-37PDF least concern (LC) * Germany – distributed in all of Germany but in 5 states in red list (''Rote Liste BRD''). * Nordic countries: Denmark, Faroes, Finland (near threa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pisidium Supinum
''Pisidium supinum'' is a species of minute freshwater clam, a pea clam, an aquatic bivalve mollusc in the family Sphaeriidae (the fingernail clams and pea clams.) The shell of this species is 3 to 5 mm in size, and is roughly triangular in shape. Distribution Its native distribution is Palearctic. * 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 Slovenské republiky. nnotated list of mollusc species recorded outdoors in the Czech and Slovak Republics. ''Malacologica Bohemoslovaca'', Suppl. 1: 1-37PDF vulnerable (VU) * Germany – endangered (''gefährdet'') * Nordic countries The Nordic countries (also known as the Nordics or ''Norden''; literal translation, lit. 'the North') are a geographical and cultural region in Northern Europe and the Atlantic Ocean, North Atlantic. It includes the sovereign states of Denmar ...: ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pisidium Globulare
''Pisidium globulare'' is a species of freshwater bivalve from the family Sphaeriidae. Distribution * 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 Slovenské republiky. nnotated list of mollusc species recorded outdoors in the Czech and Slovak Republics. ''Malacologica Bohemoslovaca'', Suppl. 1: 1-37PDF * Slovakia * Germany – North Rhine-Westphalia, Schleswig-Holstein, Mecklenburg-Western Pomerania Mecklenburg-Vorpommern (MV; ; nds, Mäkelborg-Vörpommern), also known by its anglicized name Mecklenburg–Western Pomerania, is a state in the north-east of Germany. Of the country's sixteen states, Mecklenburg-Vorpommern ranks 14th in pop ... * Latvia * Sweden * UkraineTHE PRIPYAT MARSHES OF UKRAINE http://www.minter.demon.co.uk/brown/results/speclist.htm References globulare Molluscs described in 1873 {{Sphaeriidae- ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
