Pacifastacus nigrescens (Stimpson, 1857)

Sooty crayfish



Taxonomy & Nomenclature



Conservation Status


Last record: late 1800's

IUCN RedList status: Extinct



California, USA


Biology & Ecology




One type is known to have been destroyed, probably in a Chicago fire in 1871 (Fetzner, 2008)






Original scientific description:

Stimpson, W. (1857). Notices of New Species of Crustacea in Western North America; Being an Abstract from a Paper to be Published in the Journal of the Society. Proceedings of the Boston Society of Natural History 6(6): 84-89.


Other references:

Bouchard, R. W. (1977). Distribution, systematics status, and ecological notes on five poorly known species of crayfishes in western North America (Decapoda: Astacidae and Cambaridae). Freshwater Crayfish 3: 409-423.

Fetzner, J.W. (2008). "Pacifasticus nigrescens" on Crayfish Taxonomy Browser. Available at: Accessed: 25 April 2011.

Gherardi, F. 2007. Understanding invasive crayfish. In: Gherardi, F. (ed.), Biological invaders in inland waters: profiles, distribution and threats., pp. 507-542. Springer, Dordrecht.

NatureServe. (2011). NatureServe Explorer: An online encyclopedia of life [web application]. Version 7.1. NatureServe, Arlington, Virginia. Available (Accessed: September 18, 2011).

Riegel, J.A. 1959. The systematics and distribution of crayfishes in California. Calif. Fish and Game 45(1): 29-50.

Rogers, D.C. 2005. Identification manual to the freshwater Crustacea of the western United States and adjacent areas encountered during bioassessment. Technical Publication #1. EcoAnalysts, Inc., Moscow.

Schuster, G.A., Taylor, C.A. & Cordeiro, J. (2010a). Pacifastacus nigrescens. In: IUCN 2010. IUCN Red List of Threatened Species. Version 2010.4. ( Downloaded on 25 April 2011.

Schuster, G.A., Taylor, C.A. & Cordeiro, J. 2010b. Pacifastacus nigrescens. The IUCN Red List of Threatened Species 2010: e.T15867A5247659. Downloaded on 26 June 2021.

Taylor, C.A., Schuster, G.A., Cooper, J.E., DiStefano, R.J., Eversole, A.G., Hobbs III, H.H., Robison, H.W., Skelton, C.W. and Thoma, R.F. 2007. A Reassessment of the Conservation Status of Crayfishes of the United States and Canada after 10+ Years of Increased Awareness. Fisheries, American Fisheries Society 32(8): 372-389.


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