Faxonius hathawayi blacki
Faxonius hathawayi blacki, the Calcasieu crayfish, is a sub-species of crayfish in the family Cambaridae. It is endemic to Louisiana. The common name refers to the Calcasieu River, near where the original specimens were found in Beauregard Parish, Louisiana. References

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Cambaridae
Endemic fauna of Louisiana
Endemic crustaceans of the United States
Freshwater crustaceans of North America
Crustaceans described in 1972
Taxobox trinomials not recognized by IUCN