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Pacifastacus nigrescens

Animal
Pacifastacus nigrescens, the sooty crayfish, is an extinct species of crayfish in the family Astacidae. It was originally described in 1857 by William Stimpson from the area around San Francisco, where it was once common in the creeks surrounding... Wikipedia
Higher classification: Pacifastacus
Scientific name: Pacifastacus nigrescens