The Australian freshwater crayfish (Crustacea : Decapoda : Parastacidae), with descriptions of a new species

The nine Australian genera of freshwater crayfish are diagnosed, their main morphological features illustrated, and a key for the separation of these genera is presented. Modified keys are given for those genera in which new species have been accommodated. Distribution maps of all generaand of thespecies of Engaeus (23 species), Cherax (27 species), and Euastacus (28 species) are presented. Twenty new species are described, making a total of 97 species.