Pacifastacus is a genus of crayfish 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