The Parastacidae are the family of freshwater crayfish found in the Southern Hemisphere. The family is a classic Gondwana-distributed taxon, with extant members in South America, Madagascar, Australia

Stenochiridae is a family of fossil decapod crustaceans which lived from the early Jurassic to late Cretaceous periods. It is the only family in the superfamily Stenochiroidea. Fossils of stenochirids