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| Pacifastacus fortis | |
|---|---|
| |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Malacostraca |
| Order: | Decapoda |
| Suborder: | Pleocyemata |
| Family: | Astacidae |
| Genus: | Pacifastacus |
| Species: | P. fortis
|
| Binomial name | |
| Pacifastacus fortis (Faxon, 1914)
| |
Pacifastacus fortis (known as the Shasta crayfish or placid crayfish) is an endangered crayfish species endemic to Shasta County, California, where it is found and first described in 1914, only in isolated spots along the Pit River and Fall River Mills.[4] It is estimated that there are a total of roughly 4000 of the species still alive today.[5] The exact subpopulations for the Shasta crayfish were discovered in 2004 through a genetic study that determined three different genetic clusters: Crystal Lake, the Big Lake group (which includes Big Lake Springs, JeShe, Lava, and Spring Creeks), and Thousand Springs.[6]
- ^ Johnson, D.; Taylor, C.A.; Schuster, G.A.; Cordeiro, J.; Jones, T. (2010). "Pacifastacus fortis". IUCN Red List of Threatened Species. 2010: e.T15866A5246459. doi:10.2305/IUCN.UK.2010-3.RLTS.T15866A5246459.en. Retrieved 20 November 2021.
- ^ "Shasta crayfish (Pacifastacus fortis)". Environmental Conservation Online System. U.S. Fish & Wildlife Service. Retrieved 7 October 2023.
- ^ 53 FR 38460
- ^ "Placid Crayfish (Pacifastacus fortis) | U.S. Fish & Wildlife Service". www.fws.gov. Retrieved 2024-10-22.
- ^ "Shasta Crayfish | Encyclopedia.com". www.encyclopedia.com. Retrieved 2024-10-22.
- ^ Shasta Crayfish 5-Year Review: Summary and Evaluation (PDF) (Report). U.S. Fish and Wildlife Service. August 2009. Archived from the original (PDF) on 2022-06-30.