AquaTerra-Life | Macrography: Ostracod || Makrofotografie: Muschelkrebs @AquaTerra-Life | Uploaded 9 years ago | Updated 12 hours ago
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Information on Ostracodes:
"Ostracods, or ostracodes, are a class of the Crustacea (class Ostracoda), sometimes known as seed shrimp. Some 70,000 species (only 13,000 of which are extant) have been identified, grouped into several orders. They are small crustaceans, typically around 1 mm (0.039 in) in size, but varying from 0.2 to 30 mm (0.0079 to 1.1811 in) in the case of Gigantocypris. Their bodies are flattened from side to side and protected by a bivalve-like, chitinous or calcareous valve or "shell". The hinge of the two valves is in the upper (dorsal) region of the body. Ostracods are grouped together based on gross morphology, but the group may not be monophyletic; their molecular phylogeny remains ambiguous.
Ecologically, marine ostracods can be part of the zooplankton or (most commonly) are part of the benthos, living on or inside the upper layer of the sea floor. Many ostracods, especially the Podocopida, are also found in fresh water, and terrestrial species of Mesocypris are known from humid forest soils of South Africa, Australia, New Zealand, and Tasmania.[4] They have a wide range of diets, and the group includes carnivores, herbivores, scavengers and filter feeders.
As of 2008, around 2000 species and 200 genera of nonmarine ostracods are found. However, a large portion of diversity is still undescribed, indicated by undocumented diversity hotspots of temporary habitats in Africa and Australia. Of the known specific and generic diversity of nonmarine ostracods, half (1000 species, 100 genera) belongs to one family (of 13 families), Cyprididae. Many Cyprididae occur in temporary water bodies and have drought-resistant eggs, mixed/parthenogenetic reproduction, and the ability to swim. These biological attributes preadapt them to form successful radiations in these habitats.
The body of an ostracod is encased by two valves, superficially resembling the shell of a clam. A distinction is made between the valve (hard parts) and the body with its appendages (soft parts).
The body consists of a head and thorax, separated by a slight constriction. Unlike many other crustaceans, the body is not clearly divided into segments. The abdomen is regressed or absent, whereas the adult gonads are relatively large.
The head is the largest part of the body, and bears most of the appendages. Two pairs of well-developed antennae are used to swim through the water. In addition, there is a pair of mandibles and two pairs of maxillae. The thorax typically has two pairs of appendages, but these are reduced to a single pair, or entirely absent, in many species. The two "rami", or projections, from the tip of the tail, point downwards and slightly forward from the rear of the shell.
Ostracods typically have no gills, instead taking in oxygen through branchial plates on the body surface. Most ostracods have no heart or circulatory system, and blood simply circulates between the valves of the shell. Nitrogenous waste is excreted through glands on the maxillae, antennae, or both.
The primary sense of ostracods is likely touch, as they have several sensitive hairs on their bodies and appendages. However, they do possess a single naupliar eye, and, in some cases, a pair of compound eyes, as well."
Ostracod. (2014, September 2). In Wikipedia, The Free Encyclopedia. Retrieved 19:16, October 13, 2014, from http://en.wikipedia.org/w/index.php?title=Ostracod&oldid=623856773
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Allgemeine Informationen über :
"Ostrakoden (Ostracoda) oder Muschelkrebse sind kleine, meist zwischen 0,5 und 2 mm große Krebstiere (die größten Arten erreichen jedoch bis 3 cm Körperlänge), die alle aquatischen Lebensräume (beispielsweise Tiefsee, Brackwasser, Flüsse, Seen, Grundwasser) und mit wenigen Arten den halb-aquatischen Lebensraum besiedeln.
Ostrakoden sind Gliederfüßer (Arthropoda) aus dem Unterstamm der Krebstiere (Crustacea), Klasse Ostracoda (zu altgriechisch ostrakon - Tonscherbe). Den deutschen Namen „Muschelkrebse“ verdanken die Krebse ihren den Weichkörper schützenden Hautduplikaturen, das sind mehr oder weniger median-symmetrische Ausfaltungen des Kopfes. Deren mineralisierte äußere und (seltener) innere Chitinlamelle bilden zwei Schalenhälften (Carapax), wodurch sie wie kleine Muscheln aussehen.
Heute leben schätzungsweise 10.000 bis 15.000 verschiedene Arten von Ostrakoden. Insgesamt wurden etwa 65.000 rezente und fossile Arten beschrieben, von denen aber wegen Synonymie nur ca. 33.000 heute gültig sind."
Seite „Ostrakoden“. In: Wikipedia, Die freie Enzyklopädie. Bearbeitungsstand: 2. September 2014, 20:01 UTC. URL: http://de.wikipedia.org/w/index.php?title=Ostrakoden&oldid=133666768 (Abgerufen: 13. Oktober 2014, 19:17 UTC)
Filmed with an Olympus TG-2 Tough Edition
Song: Microchip by Jason Farnham
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Information on Ostracodes:
"Ostracods, or ostracodes, are a class of the Crustacea (class Ostracoda), sometimes known as seed shrimp. Some 70,000 species (only 13,000 of which are extant) have been identified, grouped into several orders. They are small crustaceans, typically around 1 mm (0.039 in) in size, but varying from 0.2 to 30 mm (0.0079 to 1.1811 in) in the case of Gigantocypris. Their bodies are flattened from side to side and protected by a bivalve-like, chitinous or calcareous valve or "shell". The hinge of the two valves is in the upper (dorsal) region of the body. Ostracods are grouped together based on gross morphology, but the group may not be monophyletic; their molecular phylogeny remains ambiguous.
Ecologically, marine ostracods can be part of the zooplankton or (most commonly) are part of the benthos, living on or inside the upper layer of the sea floor. Many ostracods, especially the Podocopida, are also found in fresh water, and terrestrial species of Mesocypris are known from humid forest soils of South Africa, Australia, New Zealand, and Tasmania.[4] They have a wide range of diets, and the group includes carnivores, herbivores, scavengers and filter feeders.
As of 2008, around 2000 species and 200 genera of nonmarine ostracods are found. However, a large portion of diversity is still undescribed, indicated by undocumented diversity hotspots of temporary habitats in Africa and Australia. Of the known specific and generic diversity of nonmarine ostracods, half (1000 species, 100 genera) belongs to one family (of 13 families), Cyprididae. Many Cyprididae occur in temporary water bodies and have drought-resistant eggs, mixed/parthenogenetic reproduction, and the ability to swim. These biological attributes preadapt them to form successful radiations in these habitats.
The body of an ostracod is encased by two valves, superficially resembling the shell of a clam. A distinction is made between the valve (hard parts) and the body with its appendages (soft parts).
The body consists of a head and thorax, separated by a slight constriction. Unlike many other crustaceans, the body is not clearly divided into segments. The abdomen is regressed or absent, whereas the adult gonads are relatively large.
The head is the largest part of the body, and bears most of the appendages. Two pairs of well-developed antennae are used to swim through the water. In addition, there is a pair of mandibles and two pairs of maxillae. The thorax typically has two pairs of appendages, but these are reduced to a single pair, or entirely absent, in many species. The two "rami", or projections, from the tip of the tail, point downwards and slightly forward from the rear of the shell.
Ostracods typically have no gills, instead taking in oxygen through branchial plates on the body surface. Most ostracods have no heart or circulatory system, and blood simply circulates between the valves of the shell. Nitrogenous waste is excreted through glands on the maxillae, antennae, or both.
The primary sense of ostracods is likely touch, as they have several sensitive hairs on their bodies and appendages. However, they do possess a single naupliar eye, and, in some cases, a pair of compound eyes, as well."
Ostracod. (2014, September 2). In Wikipedia, The Free Encyclopedia. Retrieved 19:16, October 13, 2014, from http://en.wikipedia.org/w/index.php?title=Ostracod&oldid=623856773
___
Allgemeine Informationen über :
"Ostrakoden (Ostracoda) oder Muschelkrebse sind kleine, meist zwischen 0,5 und 2 mm große Krebstiere (die größten Arten erreichen jedoch bis 3 cm Körperlänge), die alle aquatischen Lebensräume (beispielsweise Tiefsee, Brackwasser, Flüsse, Seen, Grundwasser) und mit wenigen Arten den halb-aquatischen Lebensraum besiedeln.
Ostrakoden sind Gliederfüßer (Arthropoda) aus dem Unterstamm der Krebstiere (Crustacea), Klasse Ostracoda (zu altgriechisch ostrakon - Tonscherbe). Den deutschen Namen „Muschelkrebse“ verdanken die Krebse ihren den Weichkörper schützenden Hautduplikaturen, das sind mehr oder weniger median-symmetrische Ausfaltungen des Kopfes. Deren mineralisierte äußere und (seltener) innere Chitinlamelle bilden zwei Schalenhälften (Carapax), wodurch sie wie kleine Muscheln aussehen.
Heute leben schätzungsweise 10.000 bis 15.000 verschiedene Arten von Ostrakoden. Insgesamt wurden etwa 65.000 rezente und fossile Arten beschrieben, von denen aber wegen Synonymie nur ca. 33.000 heute gültig sind."
Seite „Ostrakoden“. In: Wikipedia, Die freie Enzyklopädie. Bearbeitungsstand: 2. September 2014, 20:01 UTC. URL: http://de.wikipedia.org/w/index.php?title=Ostrakoden&oldid=133666768 (Abgerufen: 13. Oktober 2014, 19:17 UTC)
Filmed with an Olympus TG-2 Tough Edition
Song: Microchip by Jason Farnham
