''Pacifastacus'' is a
genus
Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...
of
crayfish
Crayfish are freshwater crustaceans belonging to the infraorder Astacidea, which also contains lobsters. Taxonomically, they are members of the superfamilies Astacoidea and Parastacoidea. They breathe through feather-like gills. Some spe ...
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
*†''Pacifastacus nigrescens'' – Sooty crayfish
References
Astacidae
Crustacean genera
{{Crayfish-stub