Pacifastacus

Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Ecdysozoa
Cladus: Panarthropoda
Phylum: Arthropoda
Subphylum: Crustacea
Superclassis: Multicrustacea
Classis: Malacostraca
Subclassis: Eumalacostraca
Superordo: Eucarida
Ordo: Decapoda
Subordo: Pleocyemata
Infraordo: Astacidea
Superfamilia: Astacoidea

Familia: Astacidae
Genus: Pacifastacus
Species: Pacifastacus leniusculus

Pacifastacus is a genus of crayfish native to western North America (USA and Canada), containing six species, two of which are extinct:[1]

†Pacifastacus chenoderma (fossil: Miocene – Pliocene)
Pacifastacus connectens
Pacifastacus fortis – Shasta crayfish
Pacifastacus gambelii
Pacifastacus leniusculus – signal crayfish
†Pacifastacus nigrescens – Sooty crayfish

References

James W. Fetzner, Jr. (January 14, 2008). "Genus Pacifastacus Bott, 1950". Crayfish Taxon Browser. Carnegie Museum of Natural History. Archived from the original on June 11, 2011. Retrieved May 26, 2010.