Procambarus is a genus of crayfish in the family Cambaridae, all native to North and Central America
Cherax is a genus of crayfish in the family Parastacidae, all native to Southern Hemisphere , Southern Hemisphere contains all or parts of four continents (Antarctica, Australia, about 9/10 of South America and the southern third of Africa), four oceans (Indian, South Atlantic, Southern, and South Pacific) and most of Oceania