Parastacidae's the family of freshwater crayfish found in the southern hemisphere. The family's a classic Gondwana-distributed taxon, with extant members in South America, Madagascar, Australia, New Zealand and New Guinea, and extinct taxa also in Antarctica. Three genera are to be found in Chile, Virilastacus, Samastacus and Parastacus, the last of which also occurs disjunctly in southern Brazil. There're no crayfish native to continental Africa, but six species on Madagascar, all of the genus… (More on Parastacidae)