. . . . "Pacifastacus leniusculus"@en . . . "Pacifastacus is a genus of crayfish native to western North America, containing the following six species (DD = Data Deficient; CR = Critically Endangered; LC = Least Concern; EX = Extinct):Pacifastacus chenoderma (fossil: Miocene \u2013 Pliocene)Pacifastacus connectens DDPacifastacus fortis CR \u2013 shasta crayfishPacifastacus gambelii LCPacifastacus leniusculus LC \u2013 signal crayfishPacifastacus nigrescens EX\u2191 \u2191"@en . . . .