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Pacifastacus fortis (known as the Shasta crayfish or placid crayfish) is an endangered crayfish species endemic to Shasta County, California, where it is found and first described in 1914, only in isolated spots along the Pit River and Fall River Mills. [4] It is estimated that there are a total of roughly 4000 of the species still alive today. [5]
The signal crayfish (Pacifastacus leniusculus) is a species of crayfish indigenous to North America. Introduced to Europe in the 1960s to supplement the North European Astacus astacus fisheries, which were being damaged by crayfish plague , it was subsequently discovered that the signal was itself a carrier of that disease.
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. [1] The preserved specimen of male and female P. nigrescens, suggests that scale bars for males is 5 mm (0.20 in), while for females its 2 mm (0.079 in). The size of the specimen was 46 ...
Compared to other species of crayfish in its range, L. chimera is a sizable crayfish. On average, adults of this species range from about 9.5 to 11.8 centimeters (or 3.7 to 4.7 inches) in body length, measuring from the anterior tip of the rostrum to the posterior tip of the telson.
Astacidae is a family of freshwater crayfish native to Europe, western Asia and western North America. The family is made up of four extant (living) genera: The genera Astacus (which includes the European crayfish), Pontastacus (which includes the Turkish crayfish), and Austropotamobius are all found throughout Europe and parts of western Asia, while Pacifastacus (which includes the signal ...
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Procambarus acutus, the white river crayfish, is a species of crayfish in the family Cambaridae. It is found in North America and Europe. [3] [4] [1] [5] The IUCN conservation status of Procambarus acutus is "LC", least concern, with no immediate threat to the species' survival. The IUCN status was reviewed in 2010. [1]