Pacifastacus is a genus of crayfish native to western North America (USA and Canada), containing 8 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 Pacifastacus okanaganensis – Okanogan crayfish Pacifastacus malheurensis – Misfortunate crayfish
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