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Pacifastacus Chenoderma
''Pacifastacus'' is a genus of crayfish native to western North America (USA and Canada), containing six species, two of which are extinct: *†'' Pacifastacus chenoderma'' (fossil: Miocene – Pliocene) *''Pacifastacus connectens'' *''Pacifastacus fortis'' – Shasta crayfish *''Pacifastacus gambelii'' *''Pacifastacus leniusculus'' – signal crayfish The signal crayfish (''Pacifastacus leniusculus'') is a North American species of crayfish. It was introduced to Europe in the 1960s to supplement the North European ''Astacus astacus'' fisheries, which were being damaged by crayfish plague, but ... *†'' Pacifastacus nigrescens'' – Sooty crayfish References Astacidae Crustacean genera {{Crayfish-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pacifastacus Leniusculus
The signal crayfish (''Pacifastacus leniusculus'') is a North American species of crayfish. It was introduced to Europe in the 1960s to supplement the North European ''Astacus astacus'' fisheries, which were being damaged by crayfish plague, but the imports turned out to be a carrier of that disease. The signal crayfish is now considered an invasive species across Europe, Japan, and California, ousting native species there. Description and ecology Members of this species are typically long, although sizes up to are possible. They are bluish-brown to reddish-brown in colour, with robust, large, smooth claws. They have a white to pale blue-green patch near the claw hinge, like the white flags that signalmen used for directing trains—hence the name. The lifecycle of the signal crayfish is typical for the family Astacidae. Around 200–400 eggs are laid after mating in the autumn, and are carried under the female's tail until they are ready to hatch the following spring. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pliocene
The Pliocene ( ; also Pleiocene) is the epoch in the geologic time scale that extends from 5.333 million to 2.58See the 2014 version of the ICS geologic time scale million years ago. It is the second and most recent epoch of the Neogene Period in the . The Pliocene follows the Epoch and is followed by the Epoch. Prior to the 2009 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pacifastacus Nigrescens
''Pacifastacus nigrescens'', the sooty crayfish, is an extinct species of crayfish in the family Astacidae. It was originally described in 1857 by William Stimpson from the area around San Francisco, where it was once common in the creeks surrounding San Francisco Bay. The signal crayfish, ''Pacifastacus leniusculus'' was introduced to California, probably in the 19th century, and since then, no sightings of ''P. nigrescens'' have been made; it is now believed to be extinct. Intensive searches of its former habitat have found that every site where it once occurred is now occupied by either the signal crayfish or ''Procambarus clarkii ''Procambarus clarkii'', known variously as the red swamp crayfish, Louisiana crawfish or mudbug, is a species of cambarid crayfish native to freshwater bodies of northern Mexico, and southern and southeastern United States, but also introduc ...''. The preserved specimen of male and female ''P. nigrescens'', suggests that scale bars for male ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Signal Crayfish
The signal crayfish (''Pacifastacus leniusculus'') is a North American species of crayfish. It was introduced to Europe in the 1960s to supplement the North European ''Astacus astacus'' fisheries, which were being damaged by crayfish plague, but the imports turned out to be a carrier of that disease. The signal crayfish is now considered an invasive species across Europe, Japan, and California, ousting native species there. Description and ecology Members of this species are typically long, although sizes up to are possible. They are bluish-brown to reddish-brown in colour, with robust, large, smooth claws. They have a white to pale blue-green patch near the claw hinge, like the white flags that signalmen used for directing trains—hence the name. The lifecycle of the signal crayfish is typical for the family Astacidae. Around 200–400 eggs are laid after mating in the autumn, and are carried under the female's tail until they are ready to hatch the following spring. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pacifastacus Gambelii
''Pacifastacus'' is a genus of crayfish native to western North America (USA and Canada), containing six species, two of which are extinct: *†'' Pacifastacus chenoderma'' (fossil: Miocene – Pliocene) *'' Pacifastacus connectens'' *''Pacifastacus fortis'' – Shasta crayfish *'' Pacifastacus gambelii'' *''Pacifastacus leniusculus'' – signal crayfish The signal crayfish (''Pacifastacus leniusculus'') is a North American species of crayfish. It was introduced to Europe in the 1960s to supplement the North European ''Astacus astacus'' fisheries, which were being damaged by crayfish plague, but ... *†'' Pacifastacus nigrescens'' – Sooty crayfish References Astacidae Crustacean genera {{Crayfish-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shasta Crayfish
''Pacifastacus fortis'' (known as the Shasta crayfish or placid crayfish) is an endangered crayfish species endemic to Shasta County, California, where it is found only in isolated spots on the Pit River and Fall River Mills. The exact subpopulations for the Shasta Crayfish were discovered in 2004 through a genetic study that determined three different genetic clusters: Crystal Lake, the Big Lake group (which include Big Lake Springs, JeShe, Lava, and Spring Creeks), and Thousand Springs. Description and ecology ''P. fortis'' is thick and stocky, with relatively heavy chelae. It is usually dark brown dorsally with bright orange areas on its underside. These colors aid in camouflage in its habitat. It grows about 2-4 inches long. It lives in cold, clear, rocky areas of the mountain rivers, and feeds on microbes, algae, and small animals like snails. The animal requires a constant, steady, and untainted flow of fresh water to survive. ''P. fortis'' have 5 pairs of legs. With ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pacifastacus Fortis
''Pacifastacus fortis'' (known as the Shasta crayfish or placid crayfish) is an endangered crayfish species endemic to Shasta County, California, where it is found only in isolated spots on the Pit River and Fall River Mills. The exact subpopulations for the Shasta Crayfish were discovered in 2004 through a genetic study that determined three different genetic clusters: Crystal Lake, the Big Lake group (which include Big Lake Springs, JeShe, Lava, and Spring Creeks), and Thousand Springs. Description and ecology ''P. fortis'' is thick and stocky, with relatively heavy chelae. It is usually dark brown dorsally with bright orange areas on its underside. These colors aid in camouflage in its habitat. It grows about 2-4 inches long. It lives in cold, clear, rocky areas of the mountain rivers, and feeds on microbes, algae, and small animals like snails. The animal requires a constant, steady, and untainted flow of fresh water to survive. ''P. fortis'' have 5 pairs of legs. With ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pacifastacus Connectens
''Pacifastacus'' is a genus of crayfish native to western North America (USA and Canada), containing six species, two of which are extinct: *†'' Pacifastacus chenoderma'' (fossil: Miocene – Pliocene) *'' Pacifastacus connectens'' *''Pacifastacus fortis'' – Shasta crayfish *''Pacifastacus gambelii'' *''Pacifastacus leniusculus'' – signal crayfish The signal crayfish (''Pacifastacus leniusculus'') is a North American species of crayfish. It was introduced to Europe in the 1960s to supplement the North European ''Astacus astacus'' fisheries, which were being damaged by crayfish plague, but ... *†'' Pacifastacus nigrescens'' – Sooty crayfish References Astacidae Crustacean genera {{Crayfish-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Miocene
The Miocene ( ) is the first geological epoch of the Neogene Period and extends from about (Ma). The Miocene was named by Scottish geologist Charles Lyell; the name comes from the Greek words (', "less") and (', "new") and means "less recent" because it has 18% fewer modern marine invertebrates than the Pliocene has. The Miocene is preceded by the Oligocene and is followed by the Pliocene. As Earth went from the Oligocene through the Miocene and into the Pliocene, the climate slowly cooled towards a series of ice ages. The Miocene boundaries are not marked by a single distinct global event but consist rather of regionally defined boundaries between the warmer Oligocene and the cooler Pliocene Epoch. During the Early Miocene, the Arabian Peninsula collided with Eurasia, severing the connection between the Mediterranean and Indian Ocean, and allowing a faunal interchange to occur between Eurasia and Africa, including the dispersal of proboscideans into Eurasia. During the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Signal Crayfish
The signal crayfish (''Pacifastacus leniusculus'') is a North American species of crayfish. It was introduced to Europe in the 1960s to supplement the North European ''Astacus astacus'' fisheries, which were being damaged by crayfish plague, but the imports turned out to be a carrier of that disease. The signal crayfish is now considered an invasive species across Europe, Japan, and California, ousting native species there. Description and ecology Members of this species are typically long, although sizes up to are possible. They are bluish-brown to reddish-brown in colour, with robust, large, smooth claws. They have a white to pale blue-green patch near the claw hinge, like the white flags that signalmen used for directing trains—hence the name. The lifecycle of the signal crayfish is typical for the family Astacidae. Around 200–400 eggs are laid after mating in the autumn, and are carried under the female's tail until they are ready to hatch the following spring. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pacifastacus Chenoderma
''Pacifastacus'' is a genus of crayfish native to western North America (USA and Canada), containing six species, two of which are extinct: *†'' Pacifastacus chenoderma'' (fossil: Miocene – Pliocene) *''Pacifastacus connectens'' *''Pacifastacus fortis'' – Shasta crayfish *''Pacifastacus gambelii'' *''Pacifastacus leniusculus'' – signal crayfish The signal crayfish (''Pacifastacus leniusculus'') is a North American species of crayfish. It was introduced to Europe in the 1960s to supplement the North European ''Astacus astacus'' fisheries, which were being damaged by crayfish plague, but ... *†'' Pacifastacus nigrescens'' – Sooty crayfish References Astacidae Crustacean genera {{Crayfish-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carnegie Museum Of Natural History
The Carnegie Museum of Natural History (abbreviated as CMNH) is a natural history museum in the Oakland neighborhood of Pittsburgh, Pennsylvania. It was founded by Pittsburgh-based industrialist Andrew Carnegie in 1896. Housing some 22 million specimens, the museum features one of the finest paleontological collections in the world. Description and history The museum consists of organized into 20 galleries as well as research, library, and office space. It holds some 22 million specimens, of which about 10,000 are on view at any given time and about 1 million are cataloged in online databases. In 2008 it hosted 386,300 admissions and 63,000 school group visits. Museum education staff also actively engage in outreach by traveling to schools all around western Pennsylvania. The museum gained prominence in 1899 when its scientists unearthed the fossils of ''Diplodocus carnegii''. Notable dinosaur specimens include one of the world's very few fossils of a juvenile ''Apatosauru ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
