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The genus Cambarus is the second largest freshwater crayfish genus inhabiting the Northern Hemisphere, with only sixty fewer species than the genus Procambarus. [2] Though Cambarus are varied across species, the two terminal elements that make up the male form I gonopod form ninety degree angles with the central appendage, allowing for their identification.
Cambarus carinirostris, the rock crayfish, [2] is a species of crayfish in the family Cambaridae. It is found in the mid-Atlantic region of the United States. [3] [4]
This crayfish was first described to science as a new species in 1987. [3] There has been little formal study of this species due to its rarity. [5]It has been postulated that the four subterranean crayfish species inhabiting the Ozarks, including Cambarus aculabrum, derive from a common epigean ancestor species that gained access to a historic cave channel in the Ozark Plateau.
The Big Sandy crayfish is listed as threatened wherever found under the ESA. [2] It was originally reviewed for listing in 1991 when it was known as C. veteranus. The crayfish was proposed to be listed as endangered with C. veteranus on 7 April 2015, which is when the two new species were distinguished in the ESA (ECOS 12 month finding). [6]
Cambarus robustus, known generally as the robust crayfish or Big Water crayfish, [2] is a species of crayfish in the family Cambaridae. It is found in North America. [3] [4] [1] [5] The IUCN conservation status of Cambarus robustus is "LC", least concern, with no immediate threat to the species' survival. The population is stable.
Cambarus obeyensis, the Obey crayfish, is a species of crayfish in the family Cambaridae. It is found in North America. [2] [3] [1] The IUCN conservation status of Cambarus obeyensis is "CR", critically endangered. The species faces an extremely high risk of extinction in the immediate future. The population is decreasing.
The Cambaridae are the largest of the four families of freshwater crayfish, with over 400 species. [1] Most of the species in the family are native to the United States east of the Great Divide and Mexico, but fewer range north to Canada, and south to Guatemala and Honduras. Three live on the island of Cuba.
Cambarus asperimanus, the mitten crayfish, [2] is a species of crayfish in the family Cambaridae. It is found in North America. [3] [4] [1] [5] The IUCN conservation status of Cambarus asperimanus is "LC", least concern, with no immediate threat to the species' survival. The IUCN status was reviewed in 2010.