Pacifastacus nigrescens

Taxobox | name = "Pacifastacus nigrescens"
status = CR | status_system = IUCN2.3
regnum = Animalia
phylum = Arthropoda
subphylum = Crustacea
classis = Malacostraca
ordo = Decapoda
familia = Astacidae
genus = "Pacifastacus"
species = "P. nigrescens"
binomial = "Pacifastacus nigrescens"
binomial_authority = (Stimpson, 1857)

"Pacifastacus nigrescens", Sooty crayfish, is a species of crayfish in the family Astacidae. It is endemic to the United States.

This crayfish is believed to be near extinction due to the expanding range of "Pacifastacus leniusculus", Signal crayfish.

ource

* American Fisheries Society Endangered Species Committee 1996. [http://www.iucnredlist.org/search/details.php/15867/all "Pacifastacus nigrescens"] . [http://www.iucnredlist.org 2006 IUCN Red List of Threatened Species. ] Downloaded on 10 August 2007.

External links

* [http://www.iucnredlist.org/search/details.php/15867/all Extinction status]
* [http://nas.er.usgs.gov/queries/specimenviewer.asp?SpecimenID=4752 Signal crayfish]